:root {
    --primary: #171717;
    --on-primary: #ffffff;
    --ink: #171717;
    --body: #4d4d4d;
    --mute: #888888;
    --hairline: #ebebeb;
    --hairline-strong: #a1a1a1;
    --canvas: #ffffff;
    --canvas-soft: #fafafa;
    --canvas-soft-2: #f5f5f5;
    --link: #0070f3;
    --error: #ee0000;
    --error-soft: #f7d4d6;
    --app-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
    --mesh-opacity: 0.9;
    --theme-color: #ffffff;
    --gradient-develop-start: #007cf0;
    --gradient-develop-end: #00dfd8;
    --gradient-preview-end: #ff0080;
    --gradient-ship-end: #f9cb28;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --font: "Geist Sans", Geist, Inter, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
}

html[data-theme="dark"] {
    --primary: #ededed;
    --on-primary: #0a0a0a;
    --ink: #ededed;
    --body: #a1a1a1;
    --mute: #737373;
    --hairline: #262626;
    --hairline-strong: #525252;
    --canvas: #0a0a0a;
    --canvas-soft: #111111;
    --canvas-soft-2: #171717;
    --link: #52a8ff;
    --error: #ff6369;
    --error-soft: #3a1517;
    --app-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
    --mesh-opacity: 0.38;
    --theme-color: #0a0a0a;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

html {
    height: 100%;
    color-scheme: light;
}

html[data-theme="dark"] {
    color-scheme: dark;
}

body {
    font-family: var(--font);
    background: var(--canvas-soft);
    color: var(--ink);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(24px + var(--safe-top)) calc(24px + var(--safe-right)) calc(24px + var(--safe-bottom)) calc(24px + var(--safe-left));
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: transparent;
    position: relative;
}

.page-mesh {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse 50% 45% at 15% 20%, color-mix(in srgb, var(--gradient-develop-start) 28%, transparent), transparent 70%),
        radial-gradient(ellipse 40% 40% at 85% 25%, color-mix(in srgb, var(--gradient-preview-end) 20%, transparent), transparent 65%),
        radial-gradient(ellipse 45% 40% at 60% 90%, color-mix(in srgb, var(--gradient-ship-end) 18%, transparent), transparent 60%),
        radial-gradient(ellipse 35% 35% at 40% 50%, color-mix(in srgb, var(--gradient-develop-end) 16%, transparent), transparent 55%);
    filter: blur(48px);
    opacity: var(--mesh-opacity);
    animation: mesh-drift 18s ease-in-out infinite alternate;
}

@keyframes mesh-drift {
    from { transform: translate3d(-1%, 0, 0) scale(1); }
    to { transform: translate3d(1.5%, 1%, 0) scale(1.05); }
}

.app {
    position: relative;
    z-index: 1;
    width: min(880px, 100%);
    max-height: calc(100dvh - 48px - var(--safe-top) - var(--safe-bottom));
    display: flex;
    flex-direction: column;
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    box-shadow: var(--app-shadow);
    overflow: hidden;
    animation: rise-in 0.55s ease-out both;
}

@keyframes rise-in {
    from {
        opacity: 0.85;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.app-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--hairline);
    flex-shrink: 0;
}

.header-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
    flex-shrink: 0;
}

.header-tools {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-tools .site-nav {
    flex: 1;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    min-height: 36px;
    padding: 0;
    border: 1px solid var(--hairline);
    border-radius: 9999px;
    background: var(--canvas);
    color: var(--ink);
    cursor: pointer;
}

.theme-toggle:hover {
    border-color: var(--hairline-strong);
    background: var(--canvas-soft);
}

.theme-toggle svg {
    width: 16px;
    height: 16px;
    display: none;
}

html[data-theme="light"] .theme-icon-moon,
html:not([data-theme]) .theme-icon-moon {
    display: block;
}

html[data-theme="dark"] .theme-icon-sun {
    display: block;
}

.site-nav {
    display: flex;
    gap: 4px;
    padding: 3px;
    border: 1px solid var(--hairline);
    border-radius: 9999px;
    background: var(--canvas-soft);
}

.site-nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    min-width: 72px;
    padding: 0 14px;
    border-radius: 9999px;
    color: var(--body);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
}

.site-nav-link:hover {
    color: var(--ink);
}

.site-nav-link.is-active {
    background: var(--primary);
    color: var(--on-primary);
}

.brand h1 {
    font-size: clamp(1.35rem, 3vw, 1.75rem);
    font-weight: 600;
    letter-spacing: -0.05em;
    line-height: 1.15;
    color: var(--ink);
}

.tagline {
    margin-top: 6px;
    font-size: 14px;
    line-height: 20px;
    color: var(--body);
    max-width: 32rem;
}

.nav-tag {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--mute);
    white-space: nowrap;
    padding-top: 4px;
}

.workspace {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

.dropzone {
    margin: 16px 16px 0;
    border: 1px dashed var(--hairline-strong);
    border-radius: var(--radius-md);
    padding: 36px 20px;
    text-align: center;
    background: var(--canvas-soft);
    cursor: pointer;
    flex-shrink: 0;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.app:not(.has-files) .dropzone {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 16px;
    min-height: 220px;
}

.dropzone:hover,
.dropzone:focus-visible {
    border-color: var(--ink);
    outline: none;
}

.dropzone.dragover {
    background: var(--canvas-soft-2);
    border-color: var(--link);
    border-style: solid;
}

.dropzone.shake {
    animation: shake 0.35s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

.dropzone-kicker {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--mute);
    margin-bottom: 8px;
}

.dropzone-title {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 14px;
    color: var(--ink);
}

.file-info {
    margin-top: 14px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--mute);
}

.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    padding: 12px 16px;
    border-bottom: 1px solid var(--hairline);
    flex-shrink: 0;
}

.toolbar-settings {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 200px;
    flex-wrap: wrap;
}

.toolbar-settings label {
    font-size: 13px;
    font-weight: 500;
    color: var(--body);
    flex-shrink: 0;
}

.preset-row {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.preset-btn {
    height: 32px;
    padding: 0 12px;
    border-radius: 9999px;
    border: 1px solid var(--hairline);
    background: var(--canvas);
    color: var(--ink);
    font-family: var(--font);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
}

.preset-btn:hover {
    border-color: var(--hairline-strong);
    background: var(--canvas-soft);
}

.preset-btn.is-active {
    background: var(--primary);
    color: var(--on-primary);
    border-color: var(--primary);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 160px;
    max-width: 280px;
}

#qualitySlider {
    flex: 1;
    accent-color: var(--ink);
    cursor: pointer;
    height: 28px;
}

.quality-value {
    font-family: var(--font-mono);
    font-size: 12px;
    min-width: 40px;
    text-align: right;
    color: var(--ink);
}

.toolbar-group {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.toolbar-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--body);
    flex-shrink: 0;
}

.select-control {
    height: 32px;
    padding: 0 28px 0 12px;
    border-radius: 9999px;
    border: 1px solid var(--hairline);
    background-color: var(--canvas);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888888' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    color: var(--ink);
    font-family: var(--font);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    outline: none;
    transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

html[data-theme="dark"] .select-control {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a1a1a1' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

.select-control:hover:not(:disabled) {
    border-color: var(--hairline-strong);
    background-color: var(--canvas-soft);
}

.select-control:focus-visible {
    border-color: var(--ink);
    box-shadow: 0 0 0 1px var(--ink);
}

.select-control:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.pill-badge {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 2px 7px;
    border-radius: 9999px;
    background: var(--canvas-soft-2);
    border: 1px solid var(--hairline);
    color: var(--body);
    white-space: nowrap;
    flex-shrink: 0;
}

.transparency-grid {
    background-color: var(--canvas-soft-2);
    background-image:
        linear-gradient(45deg, color-mix(in srgb, var(--hairline-strong) 25%, transparent) 25%, transparent 25%),
        linear-gradient(-45deg, color-mix(in srgb, var(--hairline-strong) 25%, transparent) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, color-mix(in srgb, var(--hairline-strong) 25%, transparent) 75%),
        linear-gradient(-45deg, transparent 75%, color-mix(in srgb, var(--hairline-strong) 25%, transparent) 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}

.action-bar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.action-bar[hidden] {
    display: none !important;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    height: 44px;
    padding: 0 16px;
    border: 1px solid transparent;
    border-radius: 9999px;
    cursor: pointer;
    font-family: var(--font);
    font-size: 14px;
    font-weight: 500;
    line-height: 20px;
    transition: background-color 0.15s ease, border-color 0.15s ease, opacity 0.15s ease, transform 0.15s ease;
}

.btn:active:not(:disabled) {
    transform: scale(0.98);
}

.primary-btn {
    background: var(--primary);
    color: var(--on-primary);
}

.primary-btn:hover:not(:disabled) {
    opacity: 0.88;
}

.success-btn {
    background: var(--primary);
    color: var(--on-primary);
}

.success-btn:hover:not(:disabled) {
    opacity: 0.88;
}

.danger-btn {
    background: var(--canvas);
    color: var(--error);
    border-color: var(--hairline);
}

.danger-btn:hover:not(:disabled) {
    border-color: var(--error);
    background: var(--error-soft);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.icon-btn {
    width: 36px;
    min-height: 36px;
    height: 36px;
    padding: 0;
    border-radius: 9999px;
    border: 1px solid var(--hairline);
    background: var(--canvas);
    color: var(--body);
    font-size: 18px;
    line-height: 1;
}

.icon-btn:hover {
    border-color: var(--ink);
    color: var(--ink);
}

.results-container {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding: 16px;
    -webkit-overflow-scrolling: touch;
}

.results-container[hidden] {
    display: none !important;
}

.image-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
}

.image-card {
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: card-in 0.3s ease-out both;
}

@keyframes card-in {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card-header {
    padding: 10px 12px;
    border-bottom: 1px solid var(--hairline);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.file-name {
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-body {
    padding: 12px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.preview-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1.35;
    background: var(--canvas-soft-2);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.preview-wrapper.photo {
    aspect-ratio: 1;
}

.preview-wrapper img,
.compare img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.compare {
    --pos: 50%;
    isolation: isolate;
}

.compare-base,
.compare-after,
.compare-after img {
    position: absolute;
    inset: 0;
}

.compare-after {
    z-index: 1;
    overflow: hidden;
    clip-path: inset(0 50% 0 0);
}

.compare-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    left: var(--pos);
    z-index: 3;
    width: 2px;
    transform: translateX(-50%);
    background: #ffffff;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.2);
    pointer-events: none;
}

.compare-handle::after {
    content: "‹ ›";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translate(-50%, -50%);
    border-radius: 9999px;
    background: var(--canvas);
    color: var(--ink);
    border: 1px solid var(--hairline);
    font-size: 13px;
    letter-spacing: -1px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
}

.compare-range {
    position: absolute;
    inset: 0;
    z-index: 4;
    margin: 0;
    opacity: 0;
    cursor: ew-resize;
    appearance: none;
    background: transparent;
}

.compare-label {
    position: absolute;
    bottom: 8px;
    z-index: 3;
    pointer-events: none;
    font-size: 11px;
    font-weight: 500;
    line-height: 1;
    padding: 5px 8px;
    border-radius: 9999px;
    background: color-mix(in srgb, var(--canvas) 82%, transparent);
    color: var(--ink);
}

.compare-label.start {
    left: 8px;
}

.compare-label.end {
    right: 8px;
}

.pdf-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.pdf-icon {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--on-primary);
    background: var(--primary);
    border-radius: 6px;
    padding: 6px 8px;
}

.page-count {
    font-size: 13px;
    color: var(--body);
}

.stats {
    display: flex;
    justify-content: space-between;
    gap: 6px;
}

.stat-item {
    flex: 1;
    text-align: center;
}

.stat-item strong {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--ink);
}

.stat-item span {
    display: block;
    margin-top: 2px;
    font-size: 11px;
    color: var(--mute);
}

.stat-saved.worse {
    color: var(--error);
}

.download-actions .btn {
    width: 100%;
    height: 40px;
    min-height: 40px;
    font-size: 13px;
}

.loading-overlay {
    position: absolute;
    inset: 0;
    z-index: 6;
    background: color-mix(in srgb, var(--canvas) 88%, transparent);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 10px;
    font-size: 12px;
    color: var(--body);
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--hairline);
    border-top-color: var(--ink);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error-text {
    color: var(--error);
    font-size: 12px;
    padding: 0 12px;
    text-align: center;
}

.app-footer {
    padding: 12px 24px calc(12px + var(--safe-bottom));
    border-top: 1px solid var(--hairline);
    text-align: center;
    font-size: 12px;
    color: var(--mute);
    background: var(--canvas-soft);
    flex-shrink: 0;
}

@media (max-width: 640px) {
    body {
        padding: 0;
        align-items: stretch;
    }

    .app {
        width: 100%;
        max-height: none;
        min-height: 100vh;
        min-height: 100dvh;
        border: none;
        border-radius: 0;
    }

    .app-header {
        flex-direction: column;
        padding: calc(16px + var(--safe-top)) 16px 16px;
    }

    .header-meta {
        width: 100%;
        align-items: stretch;
    }

    .header-tools {
        width: 100%;
    }

    .site-nav {
        width: 100%;
        flex: 1;
    }

    .theme-toggle {
        width: 44px;
        height: 44px;
        min-height: 44px;
        flex-shrink: 0;
    }

    .site-nav-link {
        flex: 1;
    }

    .nav-tag {
        white-space: normal;
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .toolbar-settings {
        flex-wrap: wrap;
    }

    .preset-row {
        width: 100%;
    }

    .preset-btn {
        flex: 1;
        min-height: 40px;
        height: 40px;
    }

    .slider-container {
        max-width: none;
        width: 100%;
        flex-basis: 100%;
    }

    .toolbar-group {
        width: 100%;
        justify-content: space-between;
    }

    .toolbar-group .select-control {
        flex: 1;
        min-height: 40px;
        height: 40px;
    }

    .action-bar {
        width: 100%;
    }

    .action-bar .btn {
        flex: 1;
    }

    .dropzone {
        padding: 28px 16px;
    }
}

@media (hover: none) {
    .dropzone:hover {
        border-color: var(--hairline-strong);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}