:root {
    /* macOS Inspired Palette */
    --bg-mesh: radial-gradient(at 0% 0%, hsla(253, 16%, 7%, 1) 0, transparent 50%),
        radial-gradient(at 50% 0%, hsla(225, 39%, 30%, 1) 0, transparent 50%),
        radial-gradient(at 100% 0%, hsla(339, 49%, 30%, 1) 0, transparent 50%),
        radial-gradient(at 50% 100%, hsla(208, 100%, 73%, 1) 0, transparent 50%),
        radial-gradient(at 0% 100%, hsla(264, 49%, 30%, 1) 0, transparent 50%),
        radial-gradient(at 100% 100%, hsla(292, 49%, 30%, 1) 0, transparent 50%);
    --bg-base: #000000;
    --bg-overlay: radial-gradient(circle at center, transparent 0%, rgba(0, 0, 0, 0.5) 100%);
    --bg-image: url('l_w.png');

    /* Glassmorphism Refinement (iOS 18 Style) */
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.15);
    --card-blur: blur(40px) saturate(200%);

    /* Apple System Colors */
    --accent-primary: #007AFF;
    --accent-secondary: #64D2FF;
    /* SF Lighter Blue */
    --accent-gradient: linear-gradient(180deg, #007AFF 0%, #0056b3 100%);

    --text-main: #FFFFFF;
    --text-dim: rgba(255, 255, 255, 0.5);

    /* Apple "Squircle" Corners */
    --radius-full: 24px;
    --radius-mid: 18px;
    --radius-small: 10px;

    /* Soft Multi-layered Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.25);

    /* Header & Clock */
    --header-bg: rgba(255, 255, 255, 0.03);
    --header-blur: 30px;
    --clock-bg: rgba(255, 255, 255, 0.06);
    --clock-border: rgba(255, 255, 255, 0.12);

    --transition-speed: 0.3s;
    --main-font: "Inter", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", -apple-system, sans-serif;

    /* Settings Modal - Synced with Card */
    --modal-bg: var(--card-bg);
    --modal-border-color: var(--card-border);
    --modal-shadow: var(--shadow-lg);
    --modal-backdrop: var(--card-blur);

    /* Internal Elements (Buttons, Inputs, Lists) */
    --element-bg: rgba(255, 255, 255, 0.08);
    /* Generic subtle light fill */
    --element-border: rgba(255, 255, 255, 0.1);
    --element-hover-bg: rgba(255, 255, 255, 0.15);
    --slider-track: #e5e5e5;
    /* Added slider track color */
}

/* 今のUI（標準）の状態を一切変えずに、色だけ上書きする準備 */
[data-theme="dark"] {
    --bg-mesh: radial-gradient(at 0% 0%, hsla(253, 100%, 2%, 1) 0, transparent 50%),
        radial-gradient(at 50% 0%, hsla(225, 40%, 5%, 1) 0, transparent 50%),
        radial-gradient(at 100% 0%, hsla(339, 40%, 5%, 1) 0, transparent 50%),
        radial-gradient(at 50% 100%, hsla(208, 100%, 10%, 1) 0, transparent 50%),
        radial-gradient(at 0% 100%, hsla(264, 40%, 5%, 1) 0, transparent 50%),
        radial-gradient(at 100% 100%, hsla(292, 40%, 5%, 1) 0, transparent 50%);
    --bg-overlay: radial-gradient(circle at center, rgba(0, 0, 0, 0.1) 0%, rgba(0, 0, 0, 0.7) 100%);
    --bg-image: url('d_w.png');
    --card-bg: rgba(0, 0, 0, 0.3);
    /* ダークモードも透明度アップ */
    --bg-secondary: #2c2c2e;
    --bg-tertiary: #3a3a3c;
    --text-main: #f5f5f7;
    --text-secondary: #86868b;
    --border-color: rgba(255, 255, 255, 0.1);
    --slider-track: rgba(255, 255, 255, 0.2);
    /* Dark mode track color */
    --card-border: rgba(255, 255, 255, 0.06);
    --text-main: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.45);

    /* ダークモード時のヘッダー・時計の色 */
    --header-bg: rgba(0, 0, 0, 0.5);
    --header-blur: 25px;
    --clock-bg: rgba(255, 255, 255, 0.03);
    --clock-border: rgba(255, 255, 255, 0.08);

    /* Settings Modal - Dark Mode Synced */
    --modal-bg: var(--card-bg);
    --modal-border-color: var(--card-border);
    --modal-shadow: var(--shadow-lg);
    --modal-backdrop: var(--card-blur);

    /* Elements adjustment for Dark Mode if needed, currently sharing same white-alpha */
    /* If dark mode needs different element look: */
    /* --element-bg: rgba(255, 255, 255, 0.05); */
}

/* Reset & Base */
body {
    margin: 0;
    padding: 24px;
    background: var(--bg-base);
    color: var(--text-main);
    font-family: var(--main-font);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    height: 100vh;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
    isolation: isolate;
    transition: background var(--transition-speed) ease, color var(--transition-speed) ease;
}

.brand-sub {
    font-size: 10px;
    opacity: 0.9;
    color: #ffffff !important;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Background Layer */
.bg-image-layer {
    position: fixed;
    top: -5%;
    left: -5%;
    width: 110%;
    height: 110%;
    background-image: var(--bg-image), var(--bg-mesh);
    background-size: cover, 200% 200%;
    /* メッシュを大きくして動かす */
    /* 背景を拡大しすぎず、かつ余白を作らない */
    background-position: center;
    background-attachment: fixed;
    z-index: -1;
    pointer-events: none;
    transition: background-image var(--transition-speed) ease, transform 0.1s ease-out;
    animation: bgLiquid 20s ease infinite alternate;
    /* ゆっくりしたゆらぎ */
}

@keyframes bgLiquid {
    0% {
        background-position: center, 0% 0%;
    }

    100% {
        background-position: center, 100% 100%;
    }
}

/* Extra Depth Layer & Vignette */
.bg-image-layer::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        var(--bg-overlay),
        radial-gradient(circle at 10% 20%, rgba(0, 51, 137, 0.2) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(77, 171, 247, 0.15) 0%, transparent 40%);
    opacity: 0.6;
    transition: background var(--transition-speed) ease;
}

/* Startup Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 99999;
    /* Ensure top */
    display: none;
    /* Controlled by JS .active */
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal-card {
    background: #f5f5f7;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 32px;
    padding: 32px 48px;
    max-width: 580px;
    width: 90%;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    transform: scale(0.95);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] .modal-card {
    background: #1e1e1e;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.modal-content-wrapper {
    margin-bottom: 32px;
}

.modal-overlay.active .modal-card {
    transform: scale(1);
}

.modal-icon {
    font-size: 56px;
    margin-bottom: 24px;
    filter: drop-shadow(0 0 15px rgba(255, 193, 7, 0.3));
}

.modal-text-content {
    text-align: center;
}

.modal-title {
    font-size: 28px;
    font-weight: 800;
    color: #1d1d1f;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

[data-theme="dark"] .modal-title {
    color: #ffffff;
}

.modal-text {
    font-size: 16px;
    line-height: 1.8;
    color: #424245;
    opacity: 0.9;
}

[data-theme="dark"] .modal-text {
    color: #f5f5f7;
}

/* Settings Modal Specific - Liquid Glass Style */
.settings-card {
    max-width: 800px;
    width: 92%;
    height: 85vh;
    max-height: 700px;
    padding: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(40px) saturate(200%);
    -webkit-backdrop-filter: blur(40px) saturate(200%);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3),
        inset 0 0 40px rgba(255, 255, 255, 0.1);
    border-radius: 20px;
}

[data-theme="dark"] .settings-card {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5),
        inset 0 0 40px rgba(255, 255, 255, 0.05);
}

.modal-overlay.active .settings-card {
    animation: macosEntrance 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes macosEntrance {
    0% {
        transform: scale(0.92) translateY(20px);
        opacity: 0;
    }

    100% {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

/* Settings Container - 2 Column Layout */
.settings-container {
    display: flex;
    height: 100%;
    overflow: hidden;
}

/* Sidebar Navigation */
.settings-sidebar {
    width: 200px;
    background: #e8e8ed;
    border-right: 1px solid rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

[data-theme="dark"] .settings-sidebar {
    background: #2c2c2e;
    border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.settings-sidebar-header {
    height: 52px;
    padding: 0 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    display: flex;
    align-items: center;
    position: relative;
    /* For absolute positioning of title */
}

[data-theme="dark"] .settings-sidebar-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.settings-main-title {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: #1d1d1f;
    letter-spacing: -0.01em;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    white-space: nowrap;
    text-align: center;
}

[data-theme="dark"] .settings-main-title {
    color: #fff;
}

.settings-nav {
    padding: 12px 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.settings-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: #1d1d1f;
    font-size: 14px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] .settings-nav-item {
    color: rgba(255, 255, 255, 0.85);
}

.settings-nav-item:hover {
    background: rgba(0, 0, 0, 0.05);
    transform: none;
}

[data-theme="dark"] .settings-nav-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.settings-nav-item.active {
    background: rgba(0, 122, 255, 0.12);
    color: #007AFF;
    font-weight: 600;
}

[data-theme="dark"] .settings-nav-item.active {
    background: rgba(0, 122, 255, 0.2);
    color: #64D2FF;
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
}

.settings-nav-item.active .nav-icon {
    opacity: 1;
}

/* Content Area */
.settings-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: #f5f5f7;
}

[data-theme="dark"] .settings-content {
    background: #1e1e1e;
}

.traffic-light-btn {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    flex-shrink: 0;
    padding: 0;
}

.traffic-light-btn.close {
    background: #FF5F57;
}

.traffic-light-btn.minimize {
    background: #FFBD2E;
}

.traffic-light-btn.maximize {
    background: #28CA42;
}

[data-theme="dark"] .traffic-light-btn.close {
    background: #FF5F57;
}

[data-theme="dark"] .traffic-light-btn.minimize {
    background: #FFBD2E;
}

[data-theme="dark"] .traffic-light-btn.maximize {
    background: #28CA42;
}

.traffic-light-btn:hover {
    opacity: 0.8;
}

.traffic-light-btn:active {
    transform: scale(0.95);
}

.btn-close-macos {
    display: none;
}

.settings-content-body {
    flex: 1;
    overflow-y: auto;
    padding: 0 32px 32px;
}

/* Category Sections */
.settings-category {
    display: none;
}

.settings-category.active {
    display: block;
    animation: fadeInCategory 0.3s ease;
}

@keyframes fadeInCategory {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category-title {
    font-size: 28px;
    font-weight: 700;
    color: #1d1d1f;
    margin: 32px 0 24px;
    letter-spacing: -0.03em;
}

[data-theme="dark"] .category-title {
    color: #fff;
}

.settings-section {
    margin-bottom: 32px;
}

.section-label {
    font-size: 13px;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

[data-theme="dark"] .section-label {
    color: rgba(255, 255, 255, 0.6);
}

/* List Group - macOS Style */
.settings-list-group {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .settings-list-group {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.settings-list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    background: transparent;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .settings-list-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.settings-list-item:last-child {
    border-bottom: none;
}

.settings-list-item:hover {
    background: rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .settings-list-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.list-item-label {
    font-size: 14px;
    font-weight: 500;
    color: #1d1d1f;
}

[data-theme="dark"] .list-item-label {
    color: #fff;
}

/* Switch UI - Removed */

/* Theme Selector */
.theme-selector-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.theme-opt {
    background: #fff;
    border: 2px solid rgba(0, 0, 0, 0.08);
    padding: 20px 12px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    cursor: pointer;
}

[data-theme="dark"] .theme-opt {
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.theme-opt .opt-icon {
    font-size: 28px;
}

.theme-opt .opt-label {
    font-size: 13px;
    font-weight: 600;
    color: #1d1d1f;
}

[data-theme="dark"] .theme-opt .opt-label {
    color: #fff;
}

.theme-opt:hover {
    background: rgba(0, 0, 0, 0.03);
    transform: none;
    border-color: rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] .theme-opt:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}

.theme-opt.active {
    background: rgba(0, 122, 255, 0.1);
    border-color: #007AFF;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

[data-theme="dark"] .theme-opt.active {
    background: rgba(0, 122, 255, 0.15);
    border-color: #64D2FF;
    box-shadow: 0 0 0 3px rgba(100, 210, 255, 0.1);
}

/* Slider Group */
.settings-slider-group {
    background: #fff;
    border-radius: 12px;
    padding: 16px;
    border: 1px solid rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .settings-slider-group {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.slider-label-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.slider-icon {
    font-size: 16px;
    opacity: 0.7;
}

.slider-label {
    margin: 0;
    font-size: 14px;
    font-weight: 600;
    color: #1d1d1f !important;
    /* Force color */
}

[data-theme="dark"] .slider-label {
    color: #fff !important;
}

.slider-value {
    font-family: 'SF Mono', 'Monaco', monospace;
    font-weight: 500;
    color: #666;
    font-size: 14px;
}

[data-theme="dark"] .slider-value {
    color: rgba(255, 255, 255, 0.7);
}

/* Styled Range - macOS Style */
.styled-range {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(0, 0, 0, 0.08);
    border-radius: 3px;
    outline: none;
    border: none;
    margin: 0;
    transition: background 0.2s;
}

[data-theme="dark"] .styled-range {
    background: rgba(255, 255, 255, 0.1);
}

.styled-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: #fff;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    border: none;
    transition: all 0.2s;
}

.styled-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.3);
}

.styled-range:active::-webkit-slider-thumb {
    transform: scale(1.05);
}

/* History List */
.history-list {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .history-list {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.history-item {
    padding: 14px 16px;
    background: transparent;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
    color: #1d1d1f;
}

[data-theme="dark"] .history-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: #fff;
}

.history-item:last-child {
    border-bottom: none;
}

.history-item:hover {
    background: rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .history-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.history-placeholder {
    padding: 32px;
    text-align: center;
    color: #999;
    font-size: 14px;
    background: transparent;
}

[data-theme="dark"] .history-placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.history-time {
    color: #999;
    font-size: 12px;
    font-variant-numeric: tabular-nums;
}

[data-theme="dark"] .history-time {
    color: rgba(255, 255, 255, 0.5);
}

/* Info Grid */
.settings-info-grid {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .settings-info-grid {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .info-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.info-item:last-child {
    border-bottom: none;
}

.info-label {
    font-size: 14px;
    font-weight: 500;
    color: #666;
}

[data-theme="dark"] .info-label {
    color: rgba(255, 255, 255, 0.6);
}

.info-value {
    font-size: 14px;
    font-weight: 600;
    color: #1d1d1f;
}

[data-theme="dark"] .info-value {
    color: #fff;
}

.btn-danger-outline {
    width: 100%;
    background: transparent;
    border: 2px solid rgba(255, 59, 48, 0.3);
    color: #FF3B30;
    padding: 12px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s;
}

[data-theme="dark"] .btn-danger-outline {
    color: #FF453A;
    border-color: rgba(255, 69, 58, 0.4);
}

.btn-danger-outline:hover {
    background: #FF3B30;
    color: white;
    border-color: #FF3B30;
    transform: none;
}

[data-theme="dark"] .btn-danger-outline:hover {
    background: #FF453A;
    border-color: #FF453A;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    transition: background 0.3s;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.app-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: relative;
    z-index: 1;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 24px;
    background: var(--header-bg);
    backdrop-filter: blur(var(--header-blur));
    border-bottom: 1px solid var(--card-border);
    border-radius: var(--radius-mid);
    margin-bottom: 10px;
    transition: background var(--transition-speed) ease, backdrop-filter var(--transition-speed) ease;
}

.brand {
    display: flex;
    align-items: center;
    gap: 15px;
}

.brand-logo {
    padding: 10px 18px;
    background: #003389;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 18px;
    color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.1em;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-main {
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.01em;
}

.digital-clock {
    font-family: inherit;
    font-size: 24px;
    font-weight: 500;
    color: #ffffff;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    background: var(--clock-bg);
    padding: 8px 18px;
    border-radius: 12px;
    border: 1px solid var(--clock-border);
    letter-spacing: 0.03em;
    box-shadow: var(--shadow-sm);
    transition: background var(--transition-speed) ease, border-color var(--transition-speed) ease;
    font-variant-numeric: tabular-nums;
    min-width: 140px;
    text-align: center;
}

/* Header Controls */
.header-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.btn-icon {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 20px;
    opacity: 0.7;
    transition: all 0.3s;
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: 50%;
}

.btn-icon:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent-secondary);
}

.btn-icon.hidden-mode {
    color: var(--accent-secondary);
    opacity: 1;
}

/* Grid Layout */
.content-grid {
    display: grid;
    grid-template-columns: 320px 1fr 320px;
    gap: 20px;
    flex: 1;
    min-height: 0;
    /* Important for inner scroll */
    overflow: hidden;
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

body.ui-hidden .content-grid {
    opacity: 0;
    pointer-events: none;
    transform: translateY(30px) scale(0.98);
    filter: blur(10px);
}

.main-sections {
    display: flex;
    flex-direction: column;
    gap: 12px;
    /* カード間に適切な隙間を確保 */
    min-height: 0;
    position: relative;
}

/* Resize Handle */
.resize-handle {
    height: 12px;
    background: transparent;
    cursor: row-resize;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.8;
    transition: all 0.2s;
    user-select: none;
    margin: 0;
    /* 隙間は親のgapで管理 */
    z-index: 10;
    touch-action: none;
}

.resize-handle::after {
    content: "";
    width: 60px;
    /* Wider for tablet visibility */
    height: 5px;
    background: rgba(255, 255, 255, 0.25);
    border-radius: 10px;
    transition: background 0.2s;
}

.resize-handle:hover::after {
    background: var(--accent-secondary);
}

.card-execution {
    flex: 1;
    /* 初期状態で均等配分 */
    min-height: 150px;
    display: flex;
    flex-direction: column;
}

.card-builder {
    flex: 1;
    /* 初期状態で均等配分。JSで操作されると高さが固定される */
    min-height: 150px;
    display: flex;
    flex-direction: column;
}

.side-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 0;
}

.card-config {
    flex: 3;
    /* Allocation for main config */
}

.card-credits {
    flex: 0 0 auto;
    /* Compact size for credits */
}

/* Card Design Refinement */
.card {
    position: relative;
    background: transparent !important;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-full);
    display: flex;
    flex-direction: column;
    min-height: 0;
    box-shadow: var(--shadow-lg);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), flex 0.4s ease, box-shadow var(--transition-speed) ease;
    overflow: hidden;
}

/* Background & Blur Layer */
.card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--card-bg);
    backdrop-filter: var(--card-blur);
    -webkit-backdrop-filter: var(--card-blur);
    border-radius: inherit;
    z-index: -1;
    pointer-events: none;
    transition: background var(--transition-speed) ease, backdrop-filter var(--transition-speed) ease;
}

@supports not (backdrop-filter: blur(1px)) {
    .card::before {
        background: rgba(15, 23, 42, 0.8);
    }
}

.card-title {
    margin: 0;
    padding: 24px 28px 16px;
    font-size: 13px;
    font-weight: 800;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

.card-content {
    padding: 0 24px 24px;
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}



/* Builder Specifics */
.card-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-right: 16px;
    /* Reduced from 24px for more space */
    flex-shrink: 0;
    flex-wrap: wrap;
    /* Allow wrapping on very small screens */
    gap: 10px;
}

/* Ensure content takes remaining height to allow scroll */
.builder-expand-content {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    overflow: hidden;
    /* Contains scroll-v */
}

.builder-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

.btn-icon-small {
    background: rgba(255, 255, 255, 0.1);
    border: 0.5px solid rgba(255, 255, 255, 0.1);
    padding: 6px 16px;
    font-size: 13px;
    font-weight: 500;
    border-radius: 100px;
    /* Pill shape */
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-top: 6px;
}

.btn-util-small {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 5px 12px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-top: 6px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-util-small:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
    border-color: var(--accent-primary);
}

.btn-icon-small:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.02);
}

/* LCD Monitor Centering */
.monitor-container {
    position: relative;
    margin: 15px 24px;
}

.lcd-monitor {
    background: rgba(0, 0, 0, 0.85);
    /* Deep black glass look */
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 24px;
    border-radius: var(--radius-mid);
    color: #ffffff;
    /* High contrast white text */
    font-family: var(--main-font);
    min-height: 48px;
    /* Allow shrinking significantly */
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    justify-content: center;
    align-content: center;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.lcd-monitor.is-empty {
    min-height: 48px;
    opacity: 0.6;
    border: 1px dashed rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.4);
}

/* Hide Clear button when monitor is empty */
.lcd-monitor.is-empty+#clearBtn {
    display: none;
}

.btn-util-floating {
    position: absolute;
    bottom: 4px;
    right: 4px;
    background: rgba(239, 68, 68, 0.15);
    padding: 2px 10px;
    font-size: 10px;
    font-weight: 800;
    border-radius: 6px;
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    z-index: 2;
    transition: all 0.2s;
}

.btn-util-floating:hover {
    background: #ef4444;
    color: white;
    border-color: transparent;
    scale: 1.05;
}

/* Drag and Drop Styling */
.build-segment {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: grab;
    transition: all 0.2s;
    user-select: none;
    animation: slideIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

.build-segment:active {
    cursor: grabbing;
}

.build-segment.dragging {
    opacity: 0.4;
    transform: scale(0.9);
    border: 2px dashed var(--accent-secondary);
}

.build-segment.drag-over {
    border-left: 4px solid var(--accent-secondary);
    background: rgba(255, 255, 255, 0.15);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px) scale(0.9);
    }

    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

.segment-label {
    font-size: 14px;
    font-weight: 600;
    color: #fff;
}

.segment-del {
    color: #f87171 !important;
    background: transparent !important;
    border: none !important;
    padding: 0 !important;
    font-size: 18px;
    line-height: 1;
    min-width: auto;
    font-weight: 700;
}

.segment-del:hover {
    color: #ef4444 !important;
    transform: scale(1.2);
}

.builder-parts {
    flex: 1;
    padding: 0 24px 24px;
}

.part-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 8px;
    margin-top: 10px;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 4px;
}

.execution-list {
    padding: 10px 24px 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-content: start;
}

.station-row {
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 10px 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-sizing: border-box;
}

.station-row:hover {
    background: rgba(255, 255, 255, 0.05);
}

.st-name-area {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.st-btn-group {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

/* Station Row States */
.station-row.is-passing {
    background: rgba(255, 255, 255, 0.02);
    border-left: 6px solid var(--text-dim);
    border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
}

.station-row.is-passing .st-name-main {
    text-decoration: line-through;
    text-decoration-thickness: 2px;
    text-decoration-color: rgba(255, 255, 255, 0.3);
    opacity: 0.7;
}

.station-row.is-terminal {
    border-left: 6px solid #007AFF;
}

/* アクティブ状態とステータス */
.station-row.is-active {
    background: rgba(0, 122, 255, 0.1);
    border-bottom: 1px solid var(--accent-primary);
    box-shadow: 0 0 15px rgba(0, 122, 255, 0.1);
    z-index: 2;
}

.station-row.status-soon {
    background: rgba(255, 159, 67, 0.15);
    border-color: #ff9f43;
    box-shadow: 0 0 15px rgba(255, 159, 67, 0.3);
}

.station-row.is-completed {
    background: rgba(52, 199, 89, 0.03);
    border-bottom: 1px solid rgba(52, 199, 89, 0.2);
}

.station-row.is-completed .st-name-main {
    color: #34C759;
}

.st-name-area {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
}

.st-name-main {
    font-size: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.term-label {
    font-size: 10px;
    background: #007AFF;
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 800;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

.status-badge {
    font-size: 10px;
    font-weight: 900;
    color: #fff;
    background: var(--accent-primary);
    padding: 2px 8px;
    border-radius: 4px;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
    animation: applePulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    flex-shrink: 0;
}

@keyframes applePulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.85;
        transform: scale(1.02);
    }
}

.status-soon .status-badge {
    background: #f59e0b;
}

.pass-label {
    background: rgba(52, 199, 89, 0.15);
    color: #34C759;
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 11px;
    font-weight: 800;
    border: 1px solid rgba(52, 199, 89, 0.3);
    display: flex;
    align-items: center;
    gap: 4px;
}

.pass-label::before {
    content: "✓";
    font-size: 12px;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* EF Grid */
.ef-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
    /* Match border-spacing */
    padding: 10px 24px 24px;
}

.ef-grid button {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    text-align: left;
    padding: 10px 12px;
    /* Match td padding */
    width: 100%;
    border-radius: 8px;
    /* Match td radius */
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    /* Match td border */
    transition: all 0.2s ease;
}

.ef-grid button:last-child {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    /* Keep consistent */
}

.ef-grid button:hover {
    background: rgba(255, 255, 255, 0.05);
    /* Match tr:hover */
    transform: none;
}

.ef-grid button::before {
    content: "▶";
    font-size: 11px;
    color: var(--accent-secondary);
    width: 18px;
    flex-shrink: 0;
    text-shadow: 0 0 10px var(--accent-glow);
}

/* Controls */
button {
    background: rgba(255, 255, 255, 0.08);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-small);
    padding: 10px 18px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    -webkit-user-select: none;
    user-select: none;
}

button:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.btn-play-hero {
    background: var(--accent-gradient);
    border: none;
    font-weight: 800;
    padding: 12px 0;
    width: 110px;
    /* Uniform width */
    border-radius: 100px;
    box-shadow: 0 8px 25px -5px rgba(0, 122, 255, 0.5);
    color: white;
    letter-spacing: 0.05em;
}

.btn-play-hero:hover {
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 12px 35px -5px rgba(0, 122, 255, 0.6);
    filter: brightness(1.1);
}

.btn-stop {
    background: #FF3B30;
    /* iOS standard Red */
    border: none;
    color: #fff;
    font-weight: 800;
    padding: 12px 0;
    width: 110px;
    /* Uniform width */
    border-radius: 100px;
}

.btn-stop:hover {
    background: #FF453A;
    box-shadow: 0 4px 15px rgba(255, 59, 48, 0.4);
    transform: translateY(-2px);
}

.btn-next {
    background: var(--accent-gradient);
    border: none;
    color: #fff;
    font-weight: 800;
    width: 90px;
    padding: 10px 0;
    border-radius: 100px;
    font-size: 12px;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
    letter-spacing: 0.05em;
}

.btn-next:hover {
    background: var(--accent-primary);
    box-shadow: 0 6px 18px rgba(0, 122, 255, 0.4);
    transform: translateY(-2px) scale(1.03);
}

.btn-soon {
    background: linear-gradient(180deg, #FF9500 0%, #FF8000 100%);
    border: none;
    color: #fff;
    font-weight: 800;
    width: 90px;
    padding: 10px 0;
    border-radius: 100px;
    font-size: 12px;
    box-shadow: 0 4px 12px rgba(255, 149, 0, 0.3);
    letter-spacing: 0.05em;
}

.btn-soon:hover {
    background: #FF9500;
    box-shadow: 0 6px 18px rgba(255, 149, 0, 0.4);
    transform: translateY(-2px) scale(1.03);
}

.btn-util {
    color: #f87171;
    background: transparent;
}

.term-disabled-text {
    color: rgba(255, 255, 255, 0.4);
    font-size: 11px;
    font-weight: 800;
    opacity: 0.8;
    background: rgba(255, 255, 255, 0.05);
    height: 26px;
    /* Matches checkmark height */
    width: 80px;
    max-width: 90%;
    /* Responsive: prevent overflow */
    border-radius: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

/* not: true の駅専用 - 2列分いっぱいに広がる */
.disabled-full-width {
    width: calc(200% - 32px);
    max-width: calc(200% - 32px);
}

/* Swtiches & Form */
.custom-chk input {
    display: none;
}

.checkmark {
    display: inline-block;
    width: 48px;
    height: 26px;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 13px;
    position: relative;
    transition: background var(--transition-speed) ease, border-color var(--transition-speed) ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.checkmark::after {
    content: "";
    position: absolute;
    top: 3px;
    left: 4px;
    width: 18px;
    height: 18px;
    background: #ffffff;
    border-radius: 50%;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

input:checked+.stop-sw {
    background: #34C759;
    /* iOS standard Green */
    border-color: #32D74B;
    box-shadow: 0 0 15px rgba(52, 199, 89, 0.5);
    border-color: rgba(255, 255, 255, 0.3);
}

input:checked+.term-sw {
    background: #007AFF;
    box-shadow: 0 0 15px rgba(0, 122, 255, 0.5);
    border-color: rgba(255, 255, 255, 0.3);
}

input:checked+.checkmark::after {
    left: 24px;
    background: #fff;
    filter: brightness(1.2);
}

/* Table */
.master-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 8px;
}

.master-table th {
    font-size: 11px;
    text-align: left;
    color: var(--text-main);
    /* Use main text colors for high contrast */
    padding-bottom: 5px;
    opacity: 0.8;
}

.master-table td {
    padding: 10px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    /* Very subtle separator */
    vertical-align: middle;
    position: relative;
    transition: all 0.2s ease;
}

.master-table tr:last-child td {
    border-bottom: none;
}

.master-table tr:hover td {
    background: rgba(255, 255, 255, 0.05);
    /* Keep hover effect for interaction feedback */
}

.master-table td:first-child {
    border-radius: 8px 0 0 8px;
}

.master-table td:last-child {
    border-radius: 0 8px 8px 0;
}

/* Scrollbars Unified Globally - Premium iOS Look */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

*::-webkit-scrollbar {
    width: 10px;
    /* Wider hit area but inner thumb is small */
    height: 10px;
}

*::-webkit-scrollbar-track {
    background: transparent;
    padding: 2px;
}

*::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    border: 3px solid transparent;
    /* Creates floating effect */
    background-clip: content-box;
    transition: background 0.2s, width 0.2s;
}

*::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
    background-clip: content-box;
    border-width: 2px;
}

/* Scroll-v inner padding to prevent overlap with content */
.scroll-v {
    overflow-y: auto;
    scrollbar-gutter: stable;
    flex: 1;
    min-height: 0;
    padding-right: 4px;
    -webkit-overflow-scrolling: touch;
}

.section-label {
    font-size: 11px;
    font-weight: 800;
    color: var(--text-main);
    text-transform: uppercase;
    margin: 15px 0 5px;
    opacity: 0.8;
}

/* Credit info */
.card-credits .card-content {
    max-height: none;
    overflow-y: visible;
    padding: 0;
    color: #ffffff;
    /* Let items handle their own horizontal padding */
}

.credit-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 24px;
    /* Increased horizontal padding */
    border-bottom: 1px solid var(--card-border);
    font-size: 13px;
    transition: background 0.2s;
}

.credit-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.credit-item:last-child {
    border-bottom: none;
}

/* Settings Credits Styling (iOS Style Cards) */
.settings-credits {
    background: transparent;
    display: flex;
    flex-direction: column;
    gap: 1.5px;
    /* iOS separator feel */
    border-radius: 12px;
    overflow: hidden;
    width: 100%;
}

.settings-credits .credit-item {
    background: rgba(255, 255, 255, 0.04);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 18px;
    border-bottom: none;
    transition: background 0.2s;
}

.settings-credits .credit-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.settings-credits .label {
    color: var(--text-dim);
    font-size: 13px;
    font-weight: 500;
}

.settings-credits .value {
    color: var(--text-main);
    font-size: 13px;
    font-family: var(--apple-font);
    font-weight: 600;
}

/* Global Aesthetic Force (Removed section-label to allow theme switching) */
.brand-sub,
.credit-item .label,
.credit-item .value,
.master-table th {
    color: #ffffff !important;
    opacity: 0.9 !important;
}

/* Mobile Warning */
#mobile-warning {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 59, 48, 0.85);
    /* iOS Red */
    color: white;
    padding: 12px 20px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
    z-index: 9999;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    display: none;
    align-items: center;
    gap: 8px;
    max-width: 90%;
    animation: slideInUp 0.5s ease-out;
    pointer-events: auto;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

#mobile-warning span {
    flex: 1;
}

#mobile-warning-close {
    background: rgba(0, 0, 0, 0.2);
    border: none;
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    transition: background 0.2s;
}

#mobile-warning-close:hover {
    background: rgba(0, 0, 0, 0.4);
}

@keyframes slideInUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Tablet / Narrow Desktop (iPad Landscape) */
/* Old tablet query removed to prevent conflict with new iPad layout at bottom */

/* Responsive Design for Mobile */
@media (max-width: 1000px) {
    #mobile-warning {
        display: flex;
    }


    body {
        padding: 10px;
        height: auto;
        /* Allow scrolling on body for mobile */
        overflow: auto;
    }

    .app-container {
        height: auto;
        gap: 10px;
    }

    .content-grid {
        display: flex;
        /* Switch to flex column */
        flex-direction: column;
        gap: 15px;
        height: auto;
        overflow: visible;
        /* Let content expand page */
    }

    /* Reorder: 1. Main(Builder/Exec) 2. Config 3. Selection */
    .main-sections {
        order: 1;
        width: 100%;
        height: auto;
        flex: none;
        /* Disable flex sizing interaction */
    }

    .side-panel:first-of-type {
        /* Config Side Panel */
        order: 2;
        width: 100%;
        flex: none;
    }

    .side-panel:last-of-type {
        /* Selection Side Panel */
        order: 3;
        width: 100%;
        flex: none;
    }

    /* Small Screen Fixes (320px) */
    @media (max-width: 450px) {
        .card-header-flex {
            flex-direction: column;
            /* Removed !important */
            align-items: center;
            /* Removed !important */
            padding-right: 0;
            /* Removed !important */
            gap: 8px;
            /* Removed !important */
            padding-top: 12px;
        }

        .card-title {
            padding: 0;
            /* Removed !important */
            font-size: 10px;
            /* Removed !important */
            text-align: center;
            opacity: 0.7;
        }

        .builder-actions {
            transform: scale(0.8);
            padding-bottom: 8px;
        }
    }

    .card-content {
        max-height: 400px;
        /* Limit height of lists on mobile to prevent infinite scrolling */
        overflow-y: auto;
    }

    /* Hide resize handle on mobile */
    .resize-handle {
        display: none;
    }

    /* Reset Builder Card */
    .card-builder {
        height: auto !important;
        /* Override JS inline styles */
        flex: none;
    }

    .builder-expand-content {
        min-height: 200px;
        /* Ensure some height provided */
    }

    .app-header {
        padding: 10px 15px;
        flex-wrap: wrap;
        gap: 10px;
    }

    .brand-sub {
        display: none;
        /* Simplify header */
    }

    .digital-clock {
        font-size: 18px;
        padding: 6px 12px;
    }
}

/* macOS Style Toolbar */
.settings-toolbar {
    height: 52px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    background: transparent;
    flex-shrink: 0;
    gap: 16px;
    position: relative;
    /* For absolute positioning of title */
}

[data-theme="dark"] .settings-toolbar {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav-controls {
    display: flex;
    gap: 8px;
    z-index: 10;
    /* Ensure buttons are clickable */
}

/* ... nav-btn styles skip ... */

.toolbar-title {
    font-size: 15px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    white-space: nowrap;
}

[data-theme="dark"] .toolbar-title {
    color: #fff;
}

.nav-btn {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    border: none;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1d1d1f;
    opacity: 0.5;
    cursor: default;
    transition: all 0.2s;
}

[data-theme="dark"] .nav-btn {
    color: #fff;
}

.nav-btn:not(:disabled) {
    opacity: 0.8;
    cursor: pointer;
}

.nav-btn:not(:disabled):hover {
    background: rgba(0, 0, 0, 0.05);
    opacity: 1;
}

[data-theme="dark"] .nav-btn:not(:disabled):hover {
    background: rgba(255, 255, 255, 0.1);
}

.toolbar-title {
    font-size: 15px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0;
}

[data-theme="dark"] .toolbar-title {
    color: #fff;
}

/* Adjust Content Body Padding */
.settings-content-body {
    padding: 20px 32px 32px;
}

/* Responsive Setting Modal (iOS Style) */
@media (max-width: 768px) {
    .settings-container {
        display: block !important;
        position: relative;
        overflow: hidden;
    }

    .settings-sidebar {
        width: 100% !important;
        height: 100%;
        position: absolute;
        top: 0;
        left: 0;
        z-index: 2;
        transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
        background: #f5f5f7;
    }

    [data-theme="dark"] .settings-sidebar {
        background: #1e1e1e;
    }

    .settings-content {
        width: 100% !important;
        height: 100%;
        position: absolute;
        top: 0;
        left: 0;
        z-index: 3;
        transform: translateX(100%);
        transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
        background: #f5f5f7;
    }

    [data-theme="dark"] .settings-content {
        background: #1e1e1e;
    }

    /* Active State (Show Content) */
    .settings-container.show-content .settings-sidebar {
        transform: translateX(-30%);
        pointer-events: none;
    }

    .settings-container.show-content .settings-content {
        transform: translateX(0);
    }

    /* Back Button Visibility & Style */
    .nav-btn.back {
        opacity: 1 !important;
        cursor: pointer !important;
        display: flex !important;
        color: #007AFF !important;
        /* iOS Blue */
        width: auto !important;
        /* Allow text/icon fit */
        padding-right: 8px;
        /* Touch area */
        margin-left: -8px;
        /* Move further left */
    }

    .nav-btn.back svg {
        width: 22px;
        /* Minimal size increase */
        height: 22px;
        stroke-width: 2.5;
    }

    .nav-btn.back:disabled {
        opacity: 0.3 !important;
        cursor: default !important;
        color: #1d1d1f !important;
    }

    .nav-btn.forward {
        display: none !important;
        /* Hide forward button on mobile */
    }

    /* Adjust Padding for Mobile */
    .settings-content-body {
        padding: 20px;
    }
}

/* About Section Styles */
.about-header-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 40px;
    text-align: center;
}

.device-icon-wrapper {
    width: 120px;
    height: 100px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.device-icon {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
    /* Fix property name */
}

.system-name-large {
    font-size: 20px;
    font-weight: 700;
    color: #1d1d1f;
    margin: 0 0 4px;
}

[data-theme="dark"] .system-name-large {
    color: #fff;
}

.system-chip-info {
    font-size: 13px;
    color: #86868b;
    margin: 0;
}

[data-theme="dark"] .device-icon path[fill="#e2e2e4"] {
    fill: #424245;
}

[data-theme="dark"] .device-icon rect[fill="#f5f5f7"] {
    fill: #1c1c1e;
    stroke: #3a3a3c;
}

[data-theme="dark"] .device-icon circle[fill="#86868b"] {
    fill: #86868b;
}

/* Adjust Info Grid for List Look */
.settings-info-grid {
    display: grid;
    grid-template-columns: 1fr;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .settings-info-grid {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] .info-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.info-item:last-child {
    border-bottom: none;
}

/* Modern Theme Selector (macOS Style) */
.theme-selector-modern {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.theme-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
        filter 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

.theme-card:hover {
    transform: translateY(-2px) scale(1.02);
    filter: drop-shadow(0 0 12px rgba(0, 122, 255, 0.15));
}

.theme-preview {
    width: 100%;
    aspect-ratio: 16/10;
    border-radius: 6px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    margin-bottom: 8px;
    position: relative;
    overflow: hidden;
    transition: all 0.2s ease;
}

[data-theme="dark"] .theme-preview {
    border-color: rgba(255, 255, 255, 0.1);
}

.theme-card.active .theme-preview {
    border: 2px solid #007AFF;
    box-shadow: 0 0 0 1px rgba(0, 122, 255, 0.4), 0 8px 24px rgba(0, 0, 0, 0.15);
    transform: scale(1.02);
}

/* 選択時のチェックマーク */
.theme-card.active .theme-preview::after {
    content: "✓";
    position: absolute;
    bottom: 6px;
    right: 6px;
    width: 20px;
    height: 20px;
    background: #007AFF;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 900;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    animation: checkIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes checkIn {
    from {
        transform: scale(0) rotate(-45deg);
        opacity: 0;
    }

    to {
        transform: scale(1) rotate(0);
        opacity: 1;
    }
}

.theme-card .label {
    font-size: 13px;
    color: #1d1d1f;
}

[data-theme="dark"] .theme-card .label {
    color: #f5f5f7;
}

/* Preview Backgrounds */
.light-preview {
    background: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%);
}

.dark-preview {
    background: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
}

.auto-preview {
    background: linear-gradient(90deg,
            #e0c3fc 0%, #8ec5fc 50%,
            #0f2027 50%, #2c5364 100%);
}

/* Preview Window Mockup */
.preview-window {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 85%;
    height: 70%;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 8px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2),
        inset 0 0 0 0.5px rgba(255, 255, 255, 0.6);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.dark-preview .preview-window {
    background: rgba(30, 30, 30, 0.7);
    border: 0.5px solid rgba(255, 255, 255, 0.1);
}

.auto-preview .preview-window {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.5) 50%, rgba(30, 30, 30, 0.7) 50%);
}

.p-window-menu {
    height: 8px;
    background: rgba(255, 255, 255, 0.3);
    border-bottom: 0.5px solid rgba(0, 0, 0, 0.1);
}

.dark-preview .p-window-menu {
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 0.5px solid rgba(255, 255, 255, 0.05);
}

/* Window buttons in preview */
.p-window-menu::before {
    content: "";
    display: block;
    width: 4px;
    height: 4px;
    background: #ff5f56;
    border-radius: 50%;
    margin-left: 6px;
    margin-top: 2px;
    box-shadow: 6px 0 0 #ffbd2e, 12px 0 0 #28ca42;
}

.p-window-content {
    flex: 1;
    display: flex;
}

.p-window-sidebar {
    width: 25%;
    height: 100%;
    background: rgba(0, 0, 0, 0.05);
    border-right: 0.5px solid rgba(0, 0, 0, 0.1);
}

.dark-preview .p-window-sidebar {
    background: rgba(255, 255, 255, 0.05);
    border-right: 0.5px solid rgba(255, 255, 255, 0.05);
}

.p-window-main {
    flex: 1;
}

/* Reduced Animations Mode */
.reduce-animations *,
.reduce-animations *::before,
.reduce-animations *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
}

.theme-card.active {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .theme-card.active {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.info-label {
    font-size: 13px;
    font-weight: 500;
    color: #1d1d1f !important;
}

.info-value {
    font-size: 13px;
    color: #86868b !important;
    font-family: var(--main-font);
}

[data-theme="dark"] .info-label {
    color: #f5f5f7 !important;
}

[data-theme="dark"] .info-value {
    color: #86868b !important;
}

/* Settings Slider Styling */
.settings-slider-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 4px;
}

.slider-label-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.slider-icon {
    display: flex;
    align-items: center;
    color: #1d1d1f;
    opacity: 0.8;
}

[data-theme="dark"] .slider-icon {
    color: #f5f5f7;
    opacity: 0.6;
}

.slider-label {
    font-size: 13px;
    font-weight: 600;
    color: #1d1d1f;
}

[data-theme="dark"] .slider-label {
    color: #f5f5f7;
}

.slider-value {
    font-size: 13px;
    font-weight: 500;
    color: #86868b;
    font-variant-numeric: tabular-nums;
}

[data-theme="dark"] .slider-value {
    color: rgba(255, 255, 255, 0.45);
}

/* GitHub Button Styling */
.btn-github {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    padding: 10px 20px;
    color: #1d1d1f;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .btn-github {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #f5f5f7;
}

.btn-github:hover {
    background: #f5f5f7;
    border-color: rgba(0, 0, 0, 0.15);
    transform: translateY(-1px);
}

[data-theme="dark"] .btn-github:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Traffic Light Close Button with X */
.traffic-light-btn {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    border: none;
    position: relative;
    padding: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: inherit;
    transition: filter 0.2s;
}

.traffic-light-btn.close {
    background: #ff5f56;
    color: rgba(0, 0, 0, 0.4) !important;
    font-size: 11px;
    font-weight: 800;
    line-height: 1;
}

.traffic-light-btn.close:hover {
    color: rgba(0, 0, 0, 0.5) !important;
}

/* Section Header & Danger Text */
.section-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 8px;
    padding-right: 16px;
}

.section-label {
    font-size: 13px;
    font-weight: 600;
    color: #86868b;
    margin-bottom: 8px;
    margin-left: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-text-danger {
    background: transparent;
    border: none;
    color: #FF3B30;
    font-size: 13px;
    font-weight: 500;
    padding: 4px 8px;
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.2s;
}

.btn-text-danger:hover {
    background: rgba(255, 59, 48, 0.1);
}


/* Line Tabs (macOS Segmented Control Style) */
.line-tabs-container {
    padding: 16px 16px 16px;
    overflow: visible;
}

.line-tabs {
    display: flex;
    background: rgba(0, 0, 0, 0.18);
    border-radius: 10px;
    padding: 3px;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .line-tabs {
    background: rgba(0, 0, 0, 0.4);
}

.line-tab-indicator {
    position: absolute;
    top: 3px;
    bottom: 3px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 7px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    pointer-events: none;
    z-index: 0;
}

[data-theme="dark"] .line-tab-indicator {
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}

.line-tab {
    flex: 1;
    padding: 8px 4px;
    font-size: 11px;
    font-weight: 750;
    color: rgba(255, 255, 255, 0.45);
    border: none;
    background: transparent;
    cursor: pointer;
    transition: color 0.25s ease;
    white-space: nowrap;
    text-align: center;
    position: relative;
    z-index: 1;
    outline: none;
}

.line-tab:hover {
    color: rgba(255, 255, 255, 0.85);
}

.line-tab.active {
    color: #ffffff;
}

/* Line Tags in Execution List (JR West Inspired) */
.st-line-label {
    font-family: 'Hind', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 14px;
    font-weight: 700;
    width: 22px;
    height: 22px;
    border-radius: 2px;
    color: #fff;
    margin-right: 10px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    border: 1.5px solid rgba(255, 255, 255, 0.2);
}

/* 長塚線 (N) - 赤穂線・岡山エリアスタイル（黄色） */
.line-n {
    background: #F39700;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* 北東線 (H) - 学研都市・東西線スタイル（桃色） */
.line-h {
    background: #FF1493;
    color: #fff;
}

/* 鴨原空港アクセス線 (A) - JR京都・神戸線スタイル（青色） */
.line-a {
    background: #0072BC;
    color: #fff;
}

/* 以前の境界ヘッダーを非表示にする */
.line-header-row {
    display: none;
}

.part-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 8px;
    margin-top: 10px;
    max-height: 35vh;
    /* 画面高さに応じて制限 */
    overflow-y: auto;
    padding-right: 4px;
    padding-bottom: 8px;
}

/* Cleaned up conflicting media queries */

@media (max-width: 768px) {
    .p-window-sidebar {
        height: auto;
    }
}

/* Unified padding, previous extra padding rule removed */