/* Design Tokens & CSS Variables */
:root {
    --bg-main: #0B0F19;
    --bg-card: rgba(21, 27, 44, 0.7);
    --bg-card-hover: rgba(30, 39, 63, 0.85);
    --border-color: rgba(255, 255, 255, 0.1);
    --border-color-glow: rgba(99, 102, 241, 0.5);

    --primary: #6366F1;
    --primary-light: #818CF8;
    --primary-glow: rgba(99, 102, 241, 0.35);

    --accent-cyan: #06B6D4;
    --accent-emerald: #10B981;
    --accent-pink: #EC4899;
    --accent-amber: #F59E0B;

    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Plus Jakarta Sans', 'Noto Sans TC', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    padding: 24px 16px;
    display: flex;
    justify-content: center;
}

/* Dynamic Ambient Glow Background */
.app-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.22;
    animation: floatOrb 18s ease-in-out infinite alternate;
}

.orb-1 {
    width: 450px;
    height: 450px;
    background: #6366F1;
    top: -100px;
    left: -100px;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: #06B6D4;
    bottom: -150px;
    right: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: #EC4899;
    top: 40%;
    left: 40%;
    animation-delay: -10s;
}

@keyframes floatOrb {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(60px, 40px) scale(1.1); }
    100% { transform: translate(-40px, 80px) scale(0.95); }
}

/* App Container */
.container {
    width: 100%;
    max-width: 1320px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* App Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 28px;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.logo {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: #FFF;
    box-shadow: var(--shadow-glow);
}

.logo-text h1 {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-text p {
    font-size: 13px;
    color: var(--text-secondary);
}

.header-badges {
    display: flex;
    gap: 10px;
}

.badge {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 6px 14px;
    border-radius: 30px;
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.badge i {
    color: var(--accent-emerald);
}

/* Workspace Grid */
.workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

@media (max-width: 1024px) {
    .workspace {
        grid-template-columns: 1fr;
    }
}

/* Panel Styles */
.panel {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 22px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 14px;
}

.panel-header h2 {
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

.panel-header h2 i {
    color: var(--primary-light);
}

.sub-text {
    font-size: 13px;
    color: var(--text-muted);
}

/* Smart Input Container */
.smart-input-container label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 16px;
    color: var(--primary-light);
    font-size: 16px;
    pointer-events: none;
}

#smartInput {
    width: 100%;
    background: rgba(10, 14, 26, 0.6);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 50px 14px 44px;
    color: #FFF;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}

#smartInput:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.btn-icon {
    position: absolute;
    right: 10px;
    background: rgba(255, 255, 255, 0.08);
    border: none;
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--primary);
    color: #FFF;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    background: rgba(255, 255, 255, 0.02);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.05);
    transform: translateY(-2px);
}

.drop-icon {
    font-size: 32px;
    color: var(--accent-cyan);
    margin-bottom: 8px;
}

.drop-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.drop-hint {
    font-size: 12px;
    color: var(--text-muted);
}

.file-input-hidden {
    display: none;
}

/* Discrete Dimension Inputs */
.dimension-inputs-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: end;
    gap: 12px;
}

.input-group label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.number-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.number-input-wrap input {
    width: 100%;
    background: rgba(10, 14, 26, 0.6);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 38px 12px 14px;
    color: #FFF;
    font-size: 16px;
    font-weight: 700;
    transition: var(--transition);
}

.number-input-wrap input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 4px rgba(6, 182, 212, 0.25);
}

.unit {
    position: absolute;
    right: 12px;
    font-size: 12px;
    color: var(--text-muted);
    pointer-events: none;
    font-weight: 600;
}

.btn-swap {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    margin-bottom: 1px;
}

.btn-swap:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: rotate(180deg);
}

/* Presets Chips */
.presets-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.section-subtitle {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.preset-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    padding: 7px 12px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.chip:hover, .chip.active {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary-light);
    color: #FFF;
}

/* Results Dashboard */
.results-dashboard {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.primary-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(6, 182, 212, 0.15));
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.card-tag {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-cyan);
    margin-bottom: 8px;
}

.ratio-big {
    font-size: 48px;
    font-weight: 900;
    background: linear-gradient(135deg, #FFFFFF, #93C5FD);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.1;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.ratio-sub {
    display: flex;
    justify-content: center;
}

.tag-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.tag-badge.portrait {
    background: rgba(236, 72, 153, 0.18);
    color: #F472B6;
    border: 1px solid rgba(236, 72, 153, 0.3);
}

.tag-badge.landscape {
    background: rgba(6, 182, 212, 0.18);
    color: #67E8F9;
    border: 1px solid rgba(6, 182, 212, 0.3);
}

.tag-badge.square {
    background: rgba(16, 185, 129, 0.18);
    color: #6EE7B7;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Result Stats Grid */
.result-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.stat-box {
    background: rgba(10, 14, 26, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    position: relative;
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.stat-val {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-desc {
    font-size: 11px;
    color: var(--accent-cyan);
    margin-top: 2px;
}

.btn-mini-copy {
    position: absolute;
    top: 10px;
    right: 10px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 13px;
    transition: var(--transition);
}

.btn-mini-copy:hover {
    color: var(--text-primary);
}

/* Recommendation Card */
.recommendation-card {
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    font-size: 13px;
    color: #FDE68A;
    display: flex;
    align-items: center;
    gap: 10px;
}

.recommendation-card i {
    color: var(--accent-amber);
    font-size: 16px;
}

/* Action Buttons */
.copy-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.btn-action {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
}

.btn-action.primary {
    background: linear-gradient(135deg, var(--primary), #4F46E5);
    color: #FFF;
    box-shadow: var(--shadow-glow);
}

.btn-action.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-action.secondary {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-action.secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Visual Preview Section */
.header-controls {
    display: flex;
    gap: 8px;
}

.btn-toggle {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-toggle.active, .btn-toggle:hover {
    background: rgba(6, 182, 212, 0.2);
    border-color: var(--accent-cyan);
    color: #FFF;
}

/* Visual Viewport Box */
.visual-viewport {
    height: 320px;
    background: rgba(10, 14, 26, 0.7);
    border: 1px dashed rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    position: relative;
    overflow: hidden;
}

.aspect-box {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.25), rgba(6, 182, 212, 0.25));
    border: 2px solid var(--primary-light);
    border-radius: 10px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.4);
    overflow: hidden;
}

.preview-image, .preview-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
    opacity: 0.85;
}

.preview-image.hidden, .preview-video.hidden {
    display: none;
}

/* Grid Overlay (Rule of Thirds) */
.grid-overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    opacity: 0.6;
    transition: var(--transition);
}

.grid-overlay.hidden {
    opacity: 0;
}

.grid-line {
    position: absolute;
    background: rgba(255, 255, 255, 0.25);
}

.grid-line.horizontal {
    width: 100%;
    height: 1px;
}

.grid-line.horizontal.h1 { top: 33.33%; }
.grid-line.horizontal.h2 { top: 66.66%; }

.grid-line.vertical {
    height: 100%;
    width: 1px;
}

.grid-line.vertical.v1 { left: 33.33%; }
.grid-line.vertical.v2 { left: 66.66%; }

.box-dimensions-tag {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    color: #FFF;
    z-index: 3;
}

.box-ratio-center {
    position: relative;
    z-index: 3;
    font-size: 24px;
    font-weight: 900;
    color: #FFF;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
    background: rgba(0, 0, 0, 0.4);
    padding: 4px 16px;
    border-radius: 20px;
    backdrop-filter: blur(4px);
}

/* Panel Sub Cards (Crop Studio & Resizer) */
.panel-sub-card {
    background: rgba(10, 14, 26, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.panel-sub-card.hidden {
    display: none;
}

.panel-sub-card h3 {
    font-size: 15px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
}

.panel-sub-card h3 i {
    color: var(--accent-emerald);
}

.sub-desc {
    font-size: 12px;
    color: var(--text-muted);
}

.sub-desc span {
    color: var(--accent-cyan);
    font-weight: 700;
}

/* Crop Controls Studio Grid */
.crop-controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
}

@media (max-width: 640px) {
    .crop-controls-grid {
        grid-template-columns: 1fr;
    }
}

.crop-group label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.select-input {
    width: 100%;
    background: rgba(10, 14, 26, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    color: #FFF;
    font-size: 12px;
    outline: none;
    cursor: pointer;
}

.select-input:focus {
    border-color: var(--accent-cyan);
}

.range-input {
    width: 100%;
    accent-color: var(--accent-emerald);
    cursor: pointer;
    margin-top: 6px;
}

/* Export / Share Actions */
.export-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 4px;
}

/* Emerald marks whichever button is the primary path — share when the OS share
   sheet is available (it can reach the photo library), download otherwise. */
.export-btn.primary,
.share-btn.primary {
    background: linear-gradient(135deg, var(--accent-emerald), #059669);
}

.export-btn.primary:hover,
.share-btn.primary:hover {
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.export-note {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-top: 10px;
    padding: 10px 12px;
    font-size: 12px;
    line-height: 1.65;
    color: var(--text-secondary);
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: var(--radius-md);
}

.export-note i {
    color: var(--accent-cyan);
    margin-top: 3px;
    flex-shrink: 0;
}

/* Resizer Calculator */
.scaler-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: end;
    gap: 10px;
}

.scale-group label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.scale-link-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-cyan);
    font-size: 14px;
    margin-bottom: 2px;
}

.quick-scale-btns {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 4px;
}

.small-label {
    font-size: 11px;
    color: var(--text-muted);
}

.btn-pill {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-pill:hover {
    background: var(--primary);
    color: #FFF;
    border-color: var(--primary);
}

/* Reference Ratios */
.reference-ratios h3 {
    font-size: 15px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.reference-ratios h3 i {
    color: var(--accent-emerald);
}

.ref-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

@media (max-width: 640px) {
    .ref-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .result-stats-grid {
        grid-template-columns: 1fr;
    }
    .copy-actions {
        grid-template-columns: 1fr;
    }
}

.ref-item {
    background: rgba(10, 14, 26, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.ref-item:hover {
    border-color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
    transform: translateY(-2px);
}

.mini-thumb {
    width: 32px;
    height: 32px;
    border: 1.5px solid var(--accent-cyan);
    border-radius: 4px;
    background: rgba(6, 182, 212, 0.2);
}

.ratio-1-1 { width: 28px; height: 28px; }
.ratio-4-5 { width: 22px; height: 28px; }
.ratio-16-9 { width: 34px; height: 19px; }
.ratio-9-16 { width: 19px; height: 34px; }
.ratio-4-3 { width: 28px; height: 21px; }
.ratio-3-2 { width: 30px; height: 20px; }
.ratio-21-9 { width: 36px; height: 15px; }
.ratio-2-3 { width: 20px; height: 30px; }

.ref-name {
    font-size: 13px;
    font-weight: 800;
    color: var(--text-primary);
}

.ref-desc {
    font-size: 10px;
    color: var(--text-muted);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(16, 185, 129, 0.95);
    backdrop-filter: blur(10px);
    color: #FFF;
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    z-index: 9999;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.hidden {
    opacity: 0;
    transform: translate(-50%, 20px);
    pointer-events: none;
}

/* Footer */
.app-footer {
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
    padding: 16px 0;
}

.hidden {
    display: none !important;
}

/* Keep the toast's fade — the generic .hidden above would otherwise kill it outright.
   Higher specificity wins over .hidden regardless of source order. */
.toast.hidden {
    display: flex !important;
}

/* Responsive helpers */
.show-on-mobile {
    display: none;
}

/* ==========================================================================
   Mobile Layout (<= 640px)
   ========================================================================== */
@media (max-width: 640px) {

    /* --- Page frame & notch safe areas --- */
    body {
        padding-top: 12px;
        padding-bottom: calc(16px + env(safe-area-inset-bottom));
        padding-left: calc(12px + env(safe-area-inset-left));
        padding-right: calc(12px + env(safe-area-inset-right));
    }

    .container {
        gap: 16px;
    }

    .hide-on-mobile {
        display: none;
    }

    .show-on-mobile {
        display: inline;
    }

    /* --- Header: stack it. The desktop row squeezed the h1 to one glyph per line. --- */
    .app-header {
        flex-direction: column;
        align-items: stretch;
        gap: 14px;
        padding: 16px;
        border-radius: var(--radius-lg);
    }

    .logo {
        align-items: flex-start;
        gap: 12px;
    }

    .logo-icon {
        flex: 0 0 42px;
        width: 42px;
        height: 42px;
        font-size: 19px;
    }

    /* min-width:0 lets the text block shrink and wrap normally inside the flex row */
    .logo-text {
        min-width: 0;
    }

    .logo-text h1 {
        font-size: 17px;
        line-height: 1.4;
        letter-spacing: 0;
    }

    .logo-text p {
        font-size: 12px;
        line-height: 1.55;
        margin-top: 4px;
    }

    .header-badges {
        gap: 8px;
    }

    .badge {
        flex: 1 1 0;
        justify-content: center;
        min-height: 42px;
        padding: 6px 10px;
    }

    /* --- Panels --- */
    .panel {
        padding: 18px 16px;
        gap: 18px;
        border-radius: var(--radius-lg);
    }

    .panel-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .panel-header h2 {
        font-size: 16px;
        line-height: 1.4;
    }

    .panel-header .sub-text {
        font-size: 12px;
        line-height: 1.5;
    }

    .header-controls {
        width: 100%;
    }

    .panel-sub-card {
        padding: 16px 14px;
    }

    /* --- Mobile-first ordering: the file picker is the entry point here, not the
           clipboard bar (nobody copies "1024 x 1280" on a phone). --- */
    .input-section {
        display: flex;
        flex-direction: column;
    }

    .input-section .panel-header      { order: 0; }
    .input-section .drop-zone         { order: 1; }
    .input-section .dimension-inputs-grid { order: 2; }
    .input-section .presets-wrapper   { order: 3; }
    .input-section .smart-input-container { order: 4; }
    .input-section .results-dashboard { order: 5; }

    .drop-zone {
        padding: 26px 16px;
    }

    .drop-title {
        font-size: 15px;
    }

    /* --- 16px minimum on every field: anything smaller makes iOS Safari
           zoom the whole page on focus. --- */
    #smartInput,
    .number-input-wrap input,
    .select-input,
    input[type="text"],
    input[type="number"],
    select {
        font-size: 16px;
    }

    .number-input-wrap input {
        padding: 13px 40px 13px 14px;
    }

    .select-input {
        padding: 12px 12px;
        min-height: 46px;
    }

    /* --- Presets become a swipeable rail instead of a tall wrapped block ---
       The rail's min-content is ~500px, and flex/grid items default to
       min-width:auto, so without this the whole panel is forced wider than
       its container and spills past the right edge of the screen. --- */
    .container,
    .workspace,
    .panel,
    .presets-wrapper,
    .preset-chips {
        min-width: 0;
    }

    .preset-chips {
        flex-wrap: nowrap;
        overflow-x: auto;
        scroll-snap-type: x proximity;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        margin: 0 -16px;
        padding: 2px 16px 8px;
    }

    .preset-chips::-webkit-scrollbar {
        display: none;
    }

    /* Fade the cut-off edge so the rail reads as scrollable. Masking the content
       itself rather than overlaying a gradient — the panel is translucent glass,
       so any solid overlay would not match what sits behind it.
       data-fade is maintained in app.js from the scroll position. */
    .preset-chips[data-fade="right"] {
        -webkit-mask-image: linear-gradient(to right, #000 calc(100% - 44px), transparent 100%);
        mask-image: linear-gradient(to right, #000 calc(100% - 44px), transparent 100%);
    }

    .preset-chips[data-fade="left"] {
        -webkit-mask-image: linear-gradient(to right, transparent 0, #000 44px);
        mask-image: linear-gradient(to right, transparent 0, #000 44px);
    }

    .preset-chips[data-fade="both"] {
        -webkit-mask-image: linear-gradient(to right, transparent 0, #000 44px, #000 calc(100% - 44px), transparent 100%);
        mask-image: linear-gradient(to right, transparent 0, #000 44px, #000 calc(100% - 44px), transparent 100%);
    }

    .chip {
        flex: 0 0 auto;
        scroll-snap-align: start;
        display: inline-flex;
        align-items: center;
        min-height: 44px;
        padding: 0 15px;
        font-size: 13px;
    }

    /* --- Touch targets: 44px minimum --- */
    .btn-action {
        min-height: 50px;
        padding: 14px 16px;
        font-size: 15px;
    }

    .btn-pill {
        display: inline-flex;
        align-items: center;
        min-height: 40px;
        padding: 0 16px;
        font-size: 13px;
    }

    .btn-toggle {
        min-height: 40px;
        padding: 8px 14px;
        font-size: 13px;
    }

    .btn-icon,
    .btn-swap {
        min-width: 46px;
        min-height: 46px;
    }

    .btn-mini-copy {
        top: 2px;
        right: 2px;
        width: 42px;
        height: 42px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 15px;
    }

    /* Keep the label clear of the copy button's enlarged hit area */
    .stat-box:has(.btn-mini-copy) {
        padding-right: 48px;
    }

    .ref-item {
        padding: 12px 8px;
        min-height: 92px;
        justify-content: center;
    }

    /* --- Swap button sits between two stacked fields, so rotate the arrow --- */
    .dimension-inputs-grid,
    .scaler-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .btn-swap {
        justify-self: center;
    }

    .scale-link-icon {
        display: none;
    }

    /* --- Preview viewport: taller, so 9:16 sources are actually readable --- */
    .visual-viewport {
        height: 58vh;
        min-height: 280px;
        max-height: 440px;
        padding: 14px;
    }

    .export-actions {
        gap: 12px;
    }

    .toast {
        bottom: calc(18px + env(safe-area-inset-bottom));
        left: 12px;
        right: 12px;
        transform: none;
        justify-content: center;
        text-align: left;
        font-size: 13px;
        line-height: 1.5;
        padding: 12px 18px;
        border-radius: var(--radius-md);
    }

    .toast.hidden {
        transform: translateY(20px);
        opacity: 0;
    }
}

/* ==========================================================================
   Touch devices: neutralise sticky :hover states left behind after a tap
   ========================================================================== */
@media (hover: none) {
    .drop-zone:hover:not(.drag-over) {
        border-color: rgba(255, 255, 255, 0.15);
        background: rgba(255, 255, 255, 0.02);
        transform: none;
    }

    .chip:hover:not(.active) {
        background: rgba(255, 255, 255, 0.05);
        border-color: rgba(255, 255, 255, 0.08);
        color: var(--text-secondary);
    }

    .btn-toggle:hover:not(.active) {
        background: rgba(255, 255, 255, 0.06);
        border-color: var(--border-color);
        color: var(--text-secondary);
    }

    .btn-pill:hover {
        background: rgba(255, 255, 255, 0.05);
        border-color: rgba(255, 255, 255, 0.08);
        color: var(--text-secondary);
    }

    .btn-icon:hover {
        background: rgba(255, 255, 255, 0.08);
        color: var(--text-primary);
    }

    .btn-swap:hover {
        background: rgba(255, 255, 255, 0.08);
        border-color: var(--border-color);
        transform: none;
    }

    .ref-item:hover {
        border-color: var(--border-color);
        background: rgba(10, 14, 26, 0.4);
        transform: none;
    }

    .btn-action.primary:hover,
    .export-btn.primary:hover,
    .share-btn.primary:hover {
        transform: none;
        box-shadow: var(--shadow-glow);
    }

    .btn-action.secondary:hover {
        background: rgba(255, 255, 255, 0.07);
        border-color: var(--border-color);
    }

    /* Kill the blue flash and the 300ms tap delay */
    button,
    .chip,
    .ref-item,
    .drop-zone,
    .badge {
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
    }
}