/* Genebay — clean light design system (devbay family, emerald accent) */
:root {
    --bg: #f8fafc;
    --bg-soft: #f1f5f9;
    --text: #0f172a;
    --text-dim: #64748b;
    --text-faint: #94a3b8;
    --card: #ffffff;
    --card-strong: #f8fafc;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --accent-1: #059669;
    --accent-2: #047857;
    --accent-3: #10b981;
    --accent-soft: rgba(5, 150, 105, 0.08);
    --good: #10b981;
    --good-soft: rgba(16, 185, 129, 0.1);
    --warn: #d97706;
    --warn-soft: rgba(245, 158, 11, 0.12);
    --danger: #dc2626;
    --danger-soft: rgba(220, 38, 38, 0.08);
    --radius: 0.625rem;
    --shadow: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
    --shadow-hover: 0 4px 12px 0 rgba(15, 23, 42, 0.08);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
            "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

[data-theme="dark"] {
    --bg: #0f172a;
    --bg-soft: #1e293b;
    --text: #f1f5f9;
    --text-dim: #94a3b8;
    --text-faint: #64748b;
    --card: #1e293b;
    --card-strong: #0f172a;
    --border: #334155;
    --border-strong: #475569;
    --accent-1: #34d399;
    --accent-2: #6ee7b7;
    --accent-3: #059669;
    --accent-soft: rgba(52, 211, 153, 0.14);
    --good: #34d399;
    --good-soft: rgba(52, 211, 153, 0.12);
    --warn: #fbbf24;
    --warn-soft: rgba(251, 191, 36, 0.12);
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.1);
    --shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 12px 0 rgba(0, 0, 0, 0.4);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
}

.container { width: min(960px, 92vw); margin: 0 auto; }

.hidden { display: none !important; }

/* ---------- header ---------- */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-logo { display: flex; }
.brand-name { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.02em; }
.brand-accent { color: var(--accent-1); }
.nav-right { display: flex; align-items: center; gap: 10px; }
.icon-btn {
    display: flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; border-radius: 0.5rem;
    background: var(--card); border: 1px solid var(--border);
    color: var(--text-dim); cursor: pointer; transition: all 0.15s ease;
    font-family: inherit;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--card-strong); }
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

.lang-select {
    appearance: none; -webkit-appearance: none;
    background: var(--card); border: 1px solid var(--border);
    border-radius: 0.5rem; color: var(--text-dim);
    font-family: inherit; font-size: 0.8rem; font-weight: 600;
    padding: 8px 28px 8px 12px; cursor: pointer; transition: all 0.15s ease;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 10px center;
}
.lang-select:hover { color: var(--text); border-color: var(--border-strong); }

/* ---------- hero ---------- */
.hero { text-align: center; padding: 44px 0 28px; }
.hero-title {
    font-size: clamp(1.9rem, 5vw, 2.9rem);
    font-weight: 900; letter-spacing: -0.03em; line-height: 1.2;
}
.hero-title .accent-text { color: var(--accent-1); }
.hero-sub { max-width: 620px; margin: 12px auto 0; color: var(--text-dim); font-size: 1.02rem; }

/* ---------- cards ---------- */
.card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px;
    box-shadow: var(--shadow); margin-bottom: 20px;
}
.card-title { font-size: 1.05rem; font-weight: 800; margin-bottom: 4px; display: flex; align-items: center; gap: 10px; }
.card-title .step {
    flex: none; width: 24px; height: 24px; border-radius: 999px;
    background: var(--accent-soft); color: var(--accent-1);
    font-size: 0.78rem; font-weight: 800; line-height: 24px; text-align: center;
}
.card-sub { color: var(--text-dim); font-size: 0.88rem; margin-bottom: 14px; }

/* ---------- sequence input ---------- */
.seq-input {
    width: 100%;
    background: var(--card-strong); border: 1px solid var(--border);
    border-radius: 0.5rem; padding: 12px 14px;
    font-family: var(--mono); font-size: 0.92rem; line-height: 1.7;
    color: var(--text); resize: vertical; min-height: 150px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.seq-input:focus { outline: none; border-color: var(--accent-1); box-shadow: 0 0 0 3px var(--accent-soft); }

.tool-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.example-group { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.example-label { font-size: 0.8rem; font-weight: 600; color: var(--text-faint); }
.chip {
    border: 1px solid var(--border); background: var(--card);
    border-radius: 999px; padding: 5px 13px;
    font-family: inherit; font-size: 0.82rem; font-weight: 600; color: var(--text-dim);
    cursor: pointer; transition: all 0.15s ease;
}
.chip:hover { color: var(--accent-1); border-color: var(--accent-3); background: var(--accent-soft); }

.warn-bar {
    margin-top: 12px; border-radius: 0.5rem; padding: 9px 14px;
    background: var(--warn-soft); color: var(--warn);
    font-size: 0.85rem; font-weight: 600;
}

/* ---------- buttons ---------- */
.btn {
    border: 1px solid var(--border); background: var(--card);
    border-radius: 0.5rem; padding: 8px 16px;
    font-family: inherit; font-size: 0.88rem; font-weight: 600;
    color: var(--text-dim); cursor: pointer; transition: all 0.15s ease;
}
.btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--card-strong); }
.btn-sm { padding: 4px 12px; font-size: 0.8rem; border-radius: 0.375rem; }
.btn.ok { color: var(--good); border-color: var(--good); background: var(--good-soft); }

/* ---------- type badge & warnings ---------- */
.badge-row { display: flex; align-items: center; gap: 8px; }
.type-badge {
    display: inline-block; padding: 2px 11px; border-radius: 999px;
    background: var(--accent-soft); color: var(--accent-1);
    font-size: 0.76rem; font-weight: 700;
}
.type-badge.mixed { background: var(--warn-soft); color: var(--warn); }

/* ---------- stats ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.stat {
    background: var(--card-strong); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 14px 16px;
    display: flex; flex-direction: column; gap: 6px;
}
.stat-label {
    font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.06em; color: var(--text-faint);
}
.stat-value { font-size: 1.5rem; font-weight: 800; letter-spacing: -0.02em; color: var(--accent-1); }
.stat-value .stat-unit { font-size: 0.9rem; font-weight: 600; color: var(--text-dim); }
.stat-value.small { font-size: 1.15rem; }
.stat-line {
    display: flex; justify-content: space-between; align-items: baseline;
    font-size: 0.86rem; color: var(--text-dim); gap: 10px;
}
.stat-val { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }
.stat-note { font-size: 0.74rem; color: var(--text-faint); }

.gc-bar { height: 6px; border-radius: 999px; background: var(--bg-soft); border: 1px solid var(--border); overflow: hidden; }
.gc-bar-fill { display: block; height: 100%; width: 0; background: var(--accent-1); border-radius: 999px; transition: width 0.2s ease; }

.base-counts { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.base-chip {
    display: flex; align-items: center; gap: 8px;
    background: var(--card-strong); border: 1px solid var(--border);
    border-radius: 0.5rem; padding: 6px 13px;
}
.base-letter {
    font-family: var(--mono); font-weight: 700; color: var(--accent-1);
    font-size: 1rem;
}
.base-num { font-size: 0.9rem; font-weight: 700; color: var(--text); font-variant-numeric: tabular-nums; }

.note { font-size: 0.78rem; color: var(--text-faint); margin-top: 14px; line-height: 1.7; }
.note-soft { color: var(--warn); font-size: 0.8rem; margin-top: 10px; font-weight: 600; }

/* ---------- segmented tabs ---------- */
.seg { display: inline-flex; flex-wrap: wrap; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 0.5rem; padding: 3px; gap: 3px; }
.seg-btn {
    border: none; background: transparent; border-radius: 0.375rem;
    padding: 7px 13px; font-family: inherit; font-size: 0.86rem; font-weight: 600;
    color: var(--text-dim); cursor: pointer; transition: all 0.15s ease;
}
.seg-btn:hover:not(:disabled) { color: var(--text); }
.seg-btn.active { background: var(--card); color: var(--accent-1); box-shadow: var(--shadow); }
.seg-btn:disabled, .seg-btn.disabled { opacity: 0.45; cursor: not-allowed; }

/* ---------- outputs ---------- */
.empty-hint { color: var(--text-faint); font-size: 0.9rem; }
.out-desc { font-size: 0.86rem; color: var(--text-dim); margin: 12px 0 8px; }
.out-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 6px; }
.out-label { font-size: 0.8rem; font-weight: 700; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.05em; }
.seq-out {
    width: 100%; background: var(--card-strong); border: 1px solid var(--border);
    border-radius: 0.5rem; padding: 11px 13px;
    font-family: var(--mono); font-size: 0.9rem; line-height: 1.7;
    color: var(--text); white-space: pre-wrap; overflow-wrap: anywhere;
    min-height: 96px; max-height: 300px; overflow-y: auto;
}

/* ---------- translation ---------- */
.opts-row { display: flex; gap: 14px; flex-wrap: wrap; margin: 2px 0 4px; align-items: end; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field-label { font-size: 0.78rem; font-weight: 600; color: var(--text-dim); }
.input {
    background: var(--card); border: 1px solid var(--border);
    border-radius: 0.5rem; padding: 7px 11px;
    font-family: inherit; font-size: 0.9rem; color: var(--text);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.input:focus { outline: none; border-color: var(--accent-1); box-shadow: 0 0 0 3px var(--accent-soft); }
select.input { cursor: pointer; }

.tr-meta { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 8px; }
.tr-meta-item { font-size: 0.85rem; color: var(--text-dim); }
.tr-meta-item b { color: var(--accent-1); font-variant-numeric: tabular-nums; }

.aa-legend { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.aa-chip {
    border: 1px solid var(--border); background: var(--card-strong);
    border-radius: 0.375rem; padding: 2px 9px;
    font-size: 0.78rem; font-weight: 600; color: var(--text-dim);
    font-variant-numeric: tabular-nums;
}
.aa-chip.stop { color: var(--danger); border-color: var(--danger); background: var(--danger-soft); }

/* ---------- codon table ---------- */
.codon-card { padding: 16px 20px; }
.codon-card summary {
    cursor: pointer; font-size: 0.95rem; font-weight: 800;
    color: var(--text); list-style-position: outside; user-select: none;
}
.codon-card summary:hover { color: var(--accent-1); }
.codon-cap { font-size: 0.78rem; color: var(--text-faint); margin: 8px 0 10px; }
.table-wrap { overflow-x: auto; }
.codon-grid { display: grid; gap: 3px; min-width: 560px; }
.codon-row { display: grid; grid-template-columns: 22px repeat(16, 1fr); gap: 3px; }
.codon-head i { font-size: 0.72rem; font-style: normal; font-weight: 700; color: var(--text-faint); text-align: center; }
.codon-first { font-style: normal; font-family: var(--mono); font-weight: 800; color: var(--accent-1); font-size: 0.8rem; display: flex; align-items: center; }
.codon-cell {
    display: flex; align-items: center; justify-content: space-between; gap: 2px;
    background: var(--card-strong); border: 1px solid var(--border);
    border-radius: 0.3rem; padding: 2px 6px; min-width: 0;
}
.codon-cell b { font-family: var(--mono); font-size: 0.72rem; font-weight: 600; color: var(--text-dim); }
.codon-cell span { font-size: 0.78rem; font-weight: 800; color: var(--accent-2); }
.codon-cell.stop { border-color: var(--danger); background: var(--danger-soft); }
.codon-cell.stop span { color: var(--danger); }
.codon-cell.meth { border-color: var(--accent-3); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); margin-top: 32px; background: var(--card); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 26px 0; }
.footer-brand .brand-name { font-size: 1.05rem; }
.footer-tag { font-size: 0.85rem; color: var(--text-dim); margin-top: 3px; }
.footer-meta { font-size: 0.76rem; color: var(--text-faint); max-width: 440px; text-align: right; line-height: 1.7; }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
    .nav { height: auto; flex-wrap: wrap; padding: 10px 0; }
    .hero { padding: 32px 0 22px; }
    .stat-grid { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
    .footer-inner { flex-direction: column; text-align: center; }
    .footer-meta { text-align: center; }
}