:root {
    /* Light theme (default) */
    --bg: #f5f6fb;
    --surface: #ffffff;
    --surface-elevated: #ffffff;
    --surface-muted: #f1f3f9;
    --border: #e3e6ee;
    --border-strong: #c8cee0;
    --text: #1a1d2b;
    --text-muted: #5b6275;
    --text-soft: #858da3;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-soft: #eef2ff;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.10), 0 4px 12px rgba(15, 23, 42, 0.06);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --base-color: #8b5cf6;
    --sft-baseline-color: #ec4899;
    --A-75en-color: #10b981;
    --A-25en-color: #f59e0b;
    --hero-grad-1: rgba(99, 102, 241, 0.18);
    --hero-grad-2: rgba(236, 72, 153, 0.12);
    --hero-grad-bg-from: #ffffff;
    --hero-grad-bg-to: #f8f9ff;
}

[data-theme="dark"] {
    --bg: #0a0a0b;
    --surface: #121214;
    --surface-elevated: #161618;
    --surface-muted: #1c1c1f;
    --border: #25252a;
    --border-strong: #36363c;
    --text: #e6e6e7;
    --text-muted: #9a9aa0;
    --text-soft: #6a6a70;
    --accent: #7a86ff;
    --accent-hover: #9aa3ff;
    --accent-soft: rgba(122, 134, 255, 0.10);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.40), 0 1px 3px rgba(0, 0, 0, 0.30);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.45), 0 2px 4px rgba(0, 0, 0, 0.30);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.55), 0 4px 12px rgba(0, 0, 0, 0.40);
    --base-color: #b794f6;
    --sft-baseline-color: #f06ba8;
    --A-75en-color: #2ec27e;
    --A-25en-color: #f5b748;
    /* very subtle hero gradients — stay near-black */
    --hero-grad-1: rgba(255, 255, 255, 0.025);
    --hero-grad-2: rgba(255, 255, 255, 0.015);
    --hero-grad-bg-from: #121214;
    --hero-grad-bg-to: #0a0a0b;
}

* { box-sizing: border-box; }

/* Ensure HTML `hidden` attribute always wins over class-based display rules */
[hidden] { display: none !important; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
    font-family: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
    background: var(--surface-muted);
    padding: 0.05rem 0.4rem;
    border-radius: 6px;
    font-size: 0.85em;
}

/* ---------- Hero ---------- */

.hero {
    background:
        radial-gradient(ellipse at 20% 0%, var(--hero-grad-1) 0%, transparent 55%),
        radial-gradient(ellipse at 90% 30%, var(--hero-grad-2) 0%, transparent 55%),
        linear-gradient(180deg, var(--hero-grad-bg-from) 0%, var(--hero-grad-bg-to) 100%);
    border-bottom: 1px solid var(--border);
    padding: 2.5rem 0 2rem;  /* vertical only; horizontal handled by .hero-inner to match body sections */
    position: relative;
}


/* Theme toggle button (fixed top-right) */
.theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 30;  /* below backdrop (40) + drawer (50) so the modal can capture clicks */
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    line-height: 1;
    box-shadow: var(--shadow-md);
    transition: all 0.18s ease;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: rotate(15deg);
}

.theme-toggle .theme-icon-light,
.theme-toggle .theme-icon-dark {
    pointer-events: none;
    transition: opacity 0.18s ease;
}

.theme-toggle .theme-icon-dark { display: none; }
[data-theme="dark"] .theme-toggle .theme-icon-light { display: none; }
[data-theme="dark"] .theme-toggle .theme-icon-dark { display: inline; }

.hero-inner {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 2rem;  /* matches .controls / main / .prompt-display horizontal alignment */
}

.eyebrow {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.3rem 0.7rem;
    border-radius: 999px;
    margin-bottom: 0.8rem;
}

.hero h1 {
    margin: 0 0 0.5rem;
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.hero-accent {
    background: linear-gradient(120deg, #6366f1 0%, #ec4899 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-sub {
    margin: 0 0 0.6rem;
    color: var(--text-muted);
    max-width: 80ch;
    font-size: 0.95rem;
}

.hero-meta {
    margin: 0;
    color: var(--text-soft);
    font-size: 0.8rem;
    font-family: "JetBrains Mono", ui-monospace, monospace;
}

.hero-note {
    margin: 0.7rem 0 0.4rem;
    padding: 0.55rem 0.85rem;
    background: var(--surface-muted);
    border-left: 3px solid var(--accent);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 0.82rem;
    line-height: 1.5;
    max-width: 80ch;
}

/* ---------- Controls bar ---------- */

.controls {
    max-width: 1440px;
    margin: 1.25rem auto 0;
    padding: 0 2rem;
    display: flex;
    gap: 0.85rem;
    flex-wrap: wrap;
    align-items: stretch;
}

.control {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.65rem 0.9rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    min-width: 0;
}

.control-grow { flex: 1 1 280px; }
.control-prompt { flex: 2 1 380px; }

.control-label {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-soft);
    white-space: nowrap;
}

.control-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.segmented {
    display: inline-flex;
    background: var(--surface-muted);
    padding: 3px;
    border-radius: 10px;
    gap: 2px;
    flex-wrap: wrap;
}

.seg-btn {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.4rem 0.7rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.seg-btn:hover { color: var(--text); }

.seg-btn.active {
    background: var(--surface);
    color: var(--text);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.seg-count {
    opacity: 0.6;
    font-weight: 400;
    font-size: 0.8em;
}

.prompt-nav {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.icon-btn {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    font-weight: 600;
    transition: all 0.12s ease;
}

.icon-btn:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

.icon-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    background: var(--surface);
    border-color: var(--border);
    color: var(--text);
}

.prompt-jump {
    width: 60px;
    height: 32px;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0 0.5rem;
    text-align: center;
    font: inherit;
    font-variant-numeric: tabular-nums;
    background: var(--surface);
    color: var(--text);
}

.prompt-jump::-webkit-outer-spin-button,
.prompt-jump::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.ghost-btn {
    height: 32px;
    padding: 0 0.8rem;
    border: 1px solid var(--border);
    background: var(--surface);
    border-radius: 8px;
    font: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.12s ease;
}

.ghost-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

.prompt-counter {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    font-family: "JetBrains Mono", ui-monospace, monospace;
}

/* ---------- Global step slider ---------- */

.step-global {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.3rem 0.5rem;
    background: var(--surface-muted);
    border-radius: 10px;
}

.step-global input[type=range] {
    flex: 1;
    accent-color: var(--accent);
    height: 6px;
    cursor: pointer;
}

.step-end-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    flex-shrink: 0;
}

/* ---------- Models toggle bar ---------- */

.models-bar-section {
    max-width: 1440px;
    margin: 0.85rem auto 0;
    padding: 0 2rem;
}

.models-bar {
    padding: 0.7rem 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.85rem;
    flex-wrap: wrap;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.models-bar-secondary { margin-top: 0.6rem; }

.pill.pill-cat {
    padding: 0.3rem 0.75rem;
    font-size: 0.78rem;
}

.pill.pill-cat.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.browse-item-text-wrap { flex: 1; display: flex; flex-direction: column; gap: 0.35rem; min-width: 0; }
.browse-item-chips { display: flex; flex-wrap: wrap; gap: 0.25rem; }
.browse-chip {
    display: inline-block;
    font-size: 0.65rem;
    padding: 0.1rem 0.45rem;
    border-radius: 4px;
    background: var(--surface-muted);
    color: var(--text-muted);
    font-family: "JetBrains Mono", ui-monospace, monospace;
}

.pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    flex: 1 1 auto;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.35rem 0.8rem 0.35rem 0.55rem;
    border-radius: 999px;
    border: 1.5px solid var(--border);
    background: var(--surface);
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-soft);
    transition: all 0.12s ease;
    user-select: none;
    font-family: inherit;
}

.pill:hover { border-color: var(--border-strong); color: var(--text); }

.pill.active {
    background: var(--text);
    color: var(--surface);
    border-color: var(--text);
}

.pill .pill-check {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.18);
    font-size: 0.7rem;
    font-weight: 700;
    color: inherit;
    flex-shrink: 0;
}

.pill:not(.active) .pill-check {
    background: var(--surface-muted);
}

.pill .pill-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.pill .pill-dot.group-dot-base { background: var(--base-color); }
.pill .pill-dot.group-dot-sft-baseline { background: var(--sft-baseline-color); }
.pill .pill-dot.group-dot-A-75en { background: var(--A-75en-color); }
.pill .pill-dot.group-dot-A-25en { background: var(--A-25en-color); }

/* ---------- Prompt display ---------- */

.prompt-display {
    max-width: 1440px;
    margin: 1.1rem auto 0;
    padding: 0 2rem;
}

.prompt-display-head {
    display: flex;
    align-items: baseline;
    gap: 0.7rem;
    margin-bottom: 0.45rem;
}

.prompt-display-tag {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.22rem 0.55rem;
    border-radius: 6px;
}

.prompt-display-meta {
    font-size: 0.75rem;
    color: var(--text-soft);
    font-family: "JetBrains Mono", ui-monospace, monospace;
}

.prompt-text {
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-md);
    padding: 0.95rem 1.2rem;
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.96rem;
    color: var(--text);
    box-shadow: var(--shadow-sm);
    min-height: 2.5rem;
}

.prompt-tags {
    margin-top: 0.55rem;
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.prompt-tags-label {
    font-weight: 600;
    color: var(--text-soft);
    margin-right: 0.25rem;
}

.prompt-tags-list {
    color: var(--text-muted);
}

/* ---------- Main grid: 4 cards in one row ---------- */

main {
    max-width: 1440px;
    margin: 1.2rem auto 3rem;
    padding: 0 2rem;
}

.completions-display-head {
    display: flex;
    align-items: baseline;
    gap: 0.7rem;
    margin: 0.6rem 0 0.5rem;
}

.completions-display-tag {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.22rem 0.55rem;
    border-radius: 6px;
}

.completions-display-meta {
    font-size: 0.75rem;
    color: var(--text-soft);
    font-family: "JetBrains Mono", ui-monospace, monospace;
}

.cards-row {
    display: grid;
    gap: 0.85rem;
}

.cards-row-1 { grid-template-columns: minmax(0, 1fr); }
.cards-row-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cards-row-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cards-row-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.empty-state {
    background: var(--surface);
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-md);
    padding: 2.5rem 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.card {
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.85rem 0.95rem 0.95rem;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.18s ease;
    min-width: 0;
    border-top: 3px solid var(--border);
}

.card.group-base { border-top-color: var(--base-color); }
.card.group-sft-baseline { border-top-color: var(--sft-baseline-color); }
.card.group-A-75en { border-top-color: var(--A-75en-color); }
.card.group-A-25en { border-top-color: var(--A-25en-color); }

.card:hover { box-shadow: var(--shadow-md); }

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.55rem;
    padding-bottom: 0.55rem;
    border-bottom: 1px solid var(--border);
    gap: 0.4rem;
}

.card-title-wrap {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    min-width: 0;
}

.card-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.card-dot.group-dot-base { background: var(--base-color); }
.card-dot.group-dot-sft-baseline { background: var(--sft-baseline-color); }
.card-dot.group-dot-A-75en { background: var(--A-75en-color); }
.card-dot.group-dot-A-25en { background: var(--A-25en-color); }

.card-title {
    font-weight: 600;
    font-size: 0.83rem;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-step-tag {
    font-family: "JetBrains Mono", ui-monospace, monospace;
    font-size: 0.66rem;
    color: var(--text-muted);
    padding: 0.16rem 0.45rem;
    background: var(--surface-muted);
    border-radius: 5px;
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

.card-step-tag.static {
    background: transparent;
    border: 1px dashed var(--border-strong);
    color: var(--text-soft);
}

.completion {
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.83rem;
    line-height: 1.55;
    flex: 1;
    color: var(--text);
}

.completion.empty {
    color: var(--text-soft);
    font-style: italic;
}

/* ---------- Prompt list modal (slide-from-right) ---------- */

.backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
    z-index: 40;
    animation: fade-in 0.18s ease;
    cursor: pointer;
}

[data-theme="dark"] .backdrop { background: rgba(0, 0, 0, 0.65); }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

.drawer {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(540px, 92vw);
    background: var(--surface);
    border-left: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    z-index: 50;
    animation: slide-in 0.2s ease;
}

@keyframes slide-in {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

.drawer-header {
    padding: 0.9rem 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    gap: 0.6rem;
    align-items: center;
    justify-content: space-between;
    background: var(--surface);
}

.drawer-title {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
}

.close-btn {
    height: 34px;
    padding: 0 0.85rem;
    border: 1px solid var(--border);
    background: var(--surface-muted);
    border-radius: 8px;
    font: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    flex-shrink: 0;
    transition: all 0.12s ease;
}

.close-btn:hover {
    background: var(--text);
    color: var(--surface);
    border-color: var(--text);
}

.browse-list {
    list-style: none;
    margin: 0;
    padding: 0.5rem;
    overflow-y: auto;
    flex: 1;
}

.browse-item {
    display: flex;
    gap: 0.55rem;
    padding: 0.65rem 0.8rem;
    border-radius: 10px;
    cursor: pointer;
    border: 1px solid transparent;
    margin-bottom: 0.3rem;
    align-items: flex-start;
}

.browse-item:hover { background: var(--surface-muted); }

.browse-item.active {
    background: var(--accent-soft);
    border-color: var(--accent);
}

.browse-item-num {
    font-family: "JetBrains Mono", ui-monospace, monospace;
    font-size: 0.72rem;
    color: var(--text-soft);
    flex-shrink: 0;
    font-weight: 500;
    line-height: 1.45;
    min-width: 2.2rem;
}

.browse-item-text {
    font-size: 0.85rem;
    color: var(--text);
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.45;
    flex: 1;
}

/* ---------- Footer ---------- */

footer {
    border-top: 1px solid var(--border);
    padding: 1.5rem 2rem;
    color: var(--text-soft);
    font-size: 0.8rem;
    text-align: center;
    background: var(--surface);
}

footer p { margin: 0; max-width: 80ch; margin-left: auto; margin-right: auto; }

/* ---------- Responsive ---------- */

@media (max-width: 1080px) {
    .cards-row-3, .cards-row-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
    .hero { padding: 2rem 1.2rem 1.5rem; }
    .controls, .prompt-display, main { padding-left: 1.2rem; padding-right: 1.2rem; }
    .models-bar-section { padding-left: 1.2rem; padding-right: 1.2rem; }
    .cards-row-2, .cards-row-3, .cards-row-4 { grid-template-columns: 1fr; }
    .control-prompt { flex-basis: 100%; }
}