server/static/style.css

:root {
    --bg: #0b1320;
    --bg-soft: rgba(15, 28, 42, 0.75);
    --bg-elevated: rgba(18, 34, 48, 0.9);
    --surface: rgba(255, 255, 255, 0.06);
    --surface-strong: rgba(255, 255, 255, 0.12);
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.18);
    --text: #f6f4ef;
    --text-soft: rgba(246, 244, 239, 0.72);
    --text-faint: rgba(246, 244, 239, 0.46);
    --accent-coral: #f36f5e;
    --accent-gold: #ffb36a;
    --accent-teal: #2ac3c3;
    --accent-sage: #97d77d;
    --success: #73d49c;
    --danger: #ff8f8f;
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 24px;
    --shadow-panel: 0 18px 60px rgba(0, 0, 0, 0.28);
    --shadow-glow: 0 0 36px rgba(243, 111, 94, 0.14);
    --transition: 180ms ease;
    --compare: 50%;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    font-family: "DM Sans", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(243, 111, 94, 0.18), transparent 34%),
        radial-gradient(circle at 80% 10%, rgba(42, 195, 195, 0.18), transparent 28%),
        radial-gradient(circle at 50% 100%, rgba(255, 179, 106, 0.12), transparent 28%),
        var(--bg);
    color: var(--text);
    overflow-x: hidden;
}

body {
    position: relative;
}

button,
input,
textarea {
    font: inherit;
}

button {
    cursor: pointer;
}

.ambient {
    position: fixed;
    border-radius: 999px;
    filter: blur(90px);
    opacity: 0.35;
    pointer-events: none;
    z-index: 0;
    animation: drift 18s ease-in-out infinite;
}

.ambient-1 {
    width: 360px;
    height: 360px;
    top: -40px;
    left: -60px;
    background: rgba(243, 111, 94, 0.36);
}

.ambient-2 {
    width: 300px;
    height: 300px;
    right: -40px;
    top: 180px;
    background: rgba(42, 195, 195, 0.28);
    animation-delay: -6s;
}

.ambient-3 {
    width: 400px;
    height: 400px;
    left: 32%;
    bottom: -160px;
    background: rgba(255, 179, 106, 0.22);
    animation-delay: -11s;
}

@keyframes drift {
    0%,
    100% { transform: translate3d(0, 0, 0) scale(1); }
    50% { transform: translate3d(22px, -18px, 0) scale(1.08); }
}

.shell {
    position: relative;
    z-index: 1;
    max-width: 1720px;
    margin: 0 auto;
    padding: 28px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    margin-bottom: 24px;
}

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

.brand-mark {
    width: 58px;
    height: 58px;
    display: grid;
    place-items: center;
    border-radius: 18px;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.03));
    border: 1px solid var(--border);
    box-shadow: var(--shadow-glow);
}

.brand h1 {
    margin: 0;
    font-family: "Space Grotesk", sans-serif;
    font-size: 2rem;
    line-height: 1;
    letter-spacing: -0.04em;
}

.brand p {
    margin: 6px 0 0;
    color: var(--text-soft);
    max-width: 680px;
}

.status-cluster {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.status-pill,
.metric-pill {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(10, 20, 33, 0.66);
    border: 1px solid var(--border);
    backdrop-filter: blur(14px);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: var(--text-faint);
}

.status-dot.online {
    background: var(--success);
    box-shadow: 0 0 16px rgba(115, 212, 156, 0.6);
}

.status-dot.error {
    background: var(--danger);
    box-shadow: 0 0 16px rgba(255, 143, 143, 0.5);
}

.metric-label {
    color: var(--text-faint);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.metric-pill strong {
    font-size: 1.02rem;
}

.layout {
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr) 320px;
    gap: 20px;
    align-items: start;
}

.left-rail,
.right-rail,
.center-stage {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.glass {
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, rgba(20, 36, 52, 0.82), rgba(10, 22, 34, 0.72));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-panel);
    backdrop-filter: blur(20px);
}

.glass::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(255, 255, 255, 0.1), transparent 26%, transparent 70%, rgba(42, 195, 195, 0.08));
    opacity: 0.8;
    pointer-events: none;
}

.card,
.hero,
.composer {
    padding: 18px;
}

.card-head,
.hero-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 16px;
}

.eyebrow {
    display: inline-flex;
    margin-bottom: 8px;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--text-faint);
}

h2 {
    margin: 0;
    font-family: "Space Grotesk", sans-serif;
    font-size: 1.15rem;
    letter-spacing: -0.03em;
}

.mode-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.mode-tab {
    border: 1px solid transparent;
    border-radius: 16px;
    padding: 14px 12px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-soft);
    transition: transform var(--transition), border-color var(--transition), background var(--transition), color var(--transition);
}

.mode-tab:hover,
.mode-tab.active {
    transform: translateY(-1px);
    border-color: rgba(255, 179, 106, 0.45);
    background: linear-gradient(145deg, rgba(255, 179, 106, 0.18), rgba(42, 195, 195, 0.14));
    color: var(--text);
}

.mode-tab.wide {
    grid-column: span 2;
}

.mode-copy {
    margin: 14px 0 0;
    color: var(--text-soft);
    line-height: 1.5;
}

.upload-stack {
    display: grid;
    gap: 12px;
}

.upload-tile {
    text-align: left;
    padding: 16px;
    border-radius: 18px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.04);
    transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.upload-tile.primary {
    background: linear-gradient(145deg, rgba(243, 111, 94, 0.16), rgba(255, 179, 106, 0.12));
    border-color: rgba(243, 111, 94, 0.24);
}

.upload-tile:hover {
    transform: translateY(-1px);
    border-color: var(--border-strong);
    background: rgba(255, 255, 255, 0.07);
}

.tile-label {
    display: block;
    font-weight: 700;
}

.tile-meta {
    display: block;
    margin-top: 6px;
    color: var(--text-soft);
    font-size: 0.92rem;
}

.mask-panel {
    margin-top: 18px;
    padding: 14px;
    border-radius: 18px;
    border: 1px solid rgba(42, 195, 195, 0.22);
    background: rgba(42, 195, 195, 0.08);
}

.mask-head {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
    margin-bottom: 14px;
}

.mask-actions,
.chip-row,
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tool-chip,
.ghost-button,
.secondary-button {
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
    border-radius: 14px;
    padding: 9px 12px;
    transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.tool-chip.active,
.tool-chip:hover,
.ghost-button:hover,
.secondary-button:hover {
    background: rgba(255, 255, 255, 0.09);
    border-color: var(--border-strong);
    transform: translateY(-1px);
}

.thumb-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.thumb-grid.results {
    margin-top: 10px;
}

.thumb-card {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.04);
    min-height: 118px;
}

.thumb-card img {
    width: 100%;
    height: 118px;
    object-fit: cover;
    display: block;
}

.thumb-card span {
    position: absolute;
    left: 10px;
    right: 10px;
    bottom: 10px;
    padding: 6px 8px;
    border-radius: 12px;
    font-size: 0.78rem;
    background: rgba(5, 10, 18, 0.72);
}

.hero {
    padding: 18px;
}

.compare-wrap {
    position: relative;
}

.stage-frame {
    position: relative;
    min-height: 620px;
    padding: 18px;
    border-radius: 22px;
    background:
        radial-gradient(circle at 20% 18%, rgba(243, 111, 94, 0.08), transparent 24%),
        radial-gradient(circle at 80% 12%, rgba(42, 195, 195, 0.12), transparent 20%),
        rgba(5, 12, 20, 0.82);
    border: 1px solid rgba(255, 255, 255, 0.06);
    overflow: hidden;
}

.stage-media {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 580px;
    transform-origin: center center;
    transition: transform 140ms ease;
}

.stage-image,
#mask-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

#mask-canvas {
    z-index: 3;
    pointer-events: none;
}

.compare-overlay {
    position: absolute;
    inset: 0;
    width: var(--compare);
    overflow: hidden;
    border-right: 2px solid rgba(255, 255, 255, 0.72);
    z-index: 2;
}

.stage-empty {
    position: absolute;
    inset: 0;
    display: grid;
    place-content: center;
    text-align: center;
    gap: 14px;
    padding: 32px;
}

.empty-badge {
    justify-self: center;
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid rgba(255, 179, 106, 0.34);
    background: rgba(255, 179, 106, 0.1);
    color: var(--accent-gold);
    font-size: 0.82rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.stage-empty h3 {
    margin: 0;
    font-family: "Space Grotesk", sans-serif;
    font-size: 2rem;
    letter-spacing: -0.05em;
}

.stage-empty p {
    margin: 0;
    color: var(--text-soft);
    max-width: 520px;
}

.compare-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 14px;
    color: var(--text-soft);
}

#compare-slider {
    flex: 1;
    appearance: none;
    height: 6px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--accent-coral), var(--accent-teal));
    outline: none;
}

#compare-slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 999px;
    background: white;
    box-shadow: 0 0 0 5px rgba(255, 255, 255, 0.12);
}

.progress-strip {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.progress-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border);
}

.steps-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.step-chip {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(42, 195, 195, 0.12);
    border: 1px solid rgba(42, 195, 195, 0.24);
    color: var(--text);
    font-size: 0.82rem;
}

.composer-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.prompt-input {
    width: 100%;
    min-height: 126px;
    resize: vertical;
    padding: 16px 18px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.18);
    color: var(--text);
    outline: none;
    line-height: 1.6;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.prompt-input:focus {
    border-color: rgba(255, 179, 106, 0.45);
    box-shadow: 0 0 0 4px rgba(255, 179, 106, 0.12);
}

.prompt-input::placeholder {
    color: var(--text-faint);
}

.action-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.primary-button {
    border: none;
    border-radius: 18px;
    padding: 14px 18px;
    min-width: 170px;
    color: #131d25;
    font-weight: 800;
    letter-spacing: 0.01em;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-coral), var(--accent-teal));
    box-shadow: 0 18px 30px rgba(243, 111, 94, 0.22);
    transition: transform var(--transition), box-shadow var(--transition);
}

.primary-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 22px 40px rgba(243, 111, 94, 0.26);
}

.primary-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    box-shadow: none;
}

.response-banner {
    margin: 0;
    padding: 14px 16px;
    border-radius: 18px;
    background: rgba(42, 195, 195, 0.1);
    border: 1px solid rgba(42, 195, 195, 0.24);
    color: var(--text);
    line-height: 1.55;
}

.response-banner.error {
    background: rgba(255, 143, 143, 0.1);
    border-color: rgba(255, 143, 143, 0.24);
}

.mode-controls {
    display: grid;
    gap: 16px;
}

.control-group {
    display: grid;
    gap: 14px;
}

.control-group.dual {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.control-group.advanced {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field,
.range-field {
    display: grid;
    gap: 8px;
}

.field span,
.range-field span {
    color: var(--text-soft);
    font-size: 0.82rem;
}

.field input,
.range-field input {
    width: 100%;
    padding: 12px 14px;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.18);
    color: var(--text);
}

.range-field {
    grid-template-columns: 1fr;
}

.range-field strong {
    justify-self: end;
    font-size: 0.86rem;
    color: var(--accent-gold);
}

.range-field input[type="range"] {
    padding: 0;
    height: 6px;
    appearance: none;
    background: linear-gradient(90deg, rgba(243, 111, 94, 0.85), rgba(42, 195, 195, 0.85));
}

.range-field input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 999px;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.12);
}

.preset-grid,
.history-list,
.layer-list {
    display: grid;
    gap: 10px;
}

.preset-card,
.history-card-item,
.layer-item {
    position: relative;
    overflow: hidden;
    padding: 14px;
    border-radius: 18px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.05);
    transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.preset-card:hover,
.history-card-item:hover,
.layer-item:hover {
    transform: translateY(-1px);
    border-color: var(--border-strong);
    background: rgba(255, 255, 255, 0.08);
}

.preset-card h3,
.history-card-item h3,
.layer-item h3 {
    margin: 0 0 6px;
    font-size: 0.98rem;
}

.preset-card p,
.history-card-item p,
.layer-item p {
    margin: 0;
    color: var(--text-soft);
    line-height: 1.45;
    font-size: 0.88rem;
}

.preset-tags,
.history-tags,
.layer-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.mini-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.78rem;
    color: var(--text-soft);
}

.suggestion-chip {
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.suggestion-chip:hover {
    background: rgba(255, 179, 106, 0.14) !important;
    border-color: rgba(255, 179, 106, 0.45) !important;
    color: var(--accent) !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 179, 106, 0.15);
}

.suggestion-chip:active {
    transform: translateY(0);
}

.history-card-item {
    display: grid;
    grid-template-columns: 72px 1fr;
    gap: 12px;
    align-items: start;
}

.history-card-item img {
    width: 72px;
    height: 72px;
    border-radius: 14px;
    object-fit: cover;
    background: rgba(0, 0, 0, 0.2);
}

.toast-stack {
    position: fixed;
    right: 22px;
    bottom: 22px;
    display: grid;
    gap: 12px;
    z-index: 10;
}

.toast {
    min-width: 260px;
    max-width: 360px;
    padding: 14px 16px;
    border-radius: 18px;
    background: rgba(8, 15, 23, 0.92);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-panel);
    animation: toast-in 260ms ease;
}

.toast strong {
    display: block;
    margin-bottom: 6px;
}

.toast p {
    margin: 0;
    color: var(--text-soft);
    line-height: 1.5;
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

body.fullscreen-mode .shell {
    max-width: none;
    padding: 18px;
}

body.fullscreen-mode .layout {
    grid-template-columns: 1fr;
}

body.fullscreen-mode .left-rail,
body.fullscreen-mode .right-rail {
    display: none;
}

body.fullscreen-mode .stage-frame {
    min-height: calc(100vh - 260px);
}

[hidden] {
    display: none !important;
}

@media (max-width: 1360px) {
    .layout {
        grid-template-columns: 280px minmax(0, 1fr);
    }

    .right-rail {
        grid-column: 1 / -1;
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 20px;
    }
}

@media (max-width: 980px) {
    .shell {
        padding: 18px;
    }

    .topbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .layout {
        grid-template-columns: 1fr;
    }

    .left-rail,
    .right-rail {
        display: flex;
        flex-direction: column;
    }

    .stage-frame {
        min-height: 420px;
    }

    .stage-media {
        min-height: 380px;
    }

    .control-group.dual,
    .control-group.advanced {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .brand h1 {
        font-size: 1.56rem;
    }

    .card,
    .hero,
    .composer {
        padding: 14px;
    }

    .mode-grid {
        grid-template-columns: 1fr 1fr;
    }

    .hero-actions,
    .status-cluster {
        width: 100%;
    }

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

    .history-card-item {
        grid-template-columns: 1fr;
    }
}