/* ============================================================
   ARIA Universal Protocol — site styles (v0.9.0)
   Dark-mode premium, subtle glass, mobile-first.
   ============================================================ */

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

:root {
    /* Surfaces */
    --bg:            #0a0a0f;
    --bg-elev-1:     #0f0f17;
    --bg-elev-2:     #151521;
    --surface:       #151521;
    --surface-soft:  rgba(255, 255, 255, 0.03);
    --border:        rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);

    /* Text */
    --text:          #f0f0f5;
    --text-muted:    #a0a0b0;
    --text-dim:      #6e6e80;

    /* Tier accents */
    --efficiency:    #3b82f6;
    --quality:       #10b981;
    --specialist:    #a855f7;

    /* Generic accents */
    --accent:        #3b82f6;
    --accent-soft:   rgba(59, 130, 246, 0.16);
    --danger:        #ef4444;
    --warning:       #f59e0b;

    /* Layout */
    --max-w:         1200px;
    --radius-sm:     8px;
    --radius:        12px;
    --radius-lg:     20px;

    /* Type */
    --font-sans:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono:     'JetBrains Mono', 'SF Mono', 'Fira Code', 'Roboto Mono', monospace;
}

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: color 0.18s ease; }
a:hover { color: #60a5fa; }

::selection { background: var(--accent-soft); color: var(--text); }

.container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Backdrop grid (very subtle) ===== */
.bg-grid {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image:
        radial-gradient(circle at 20% 0%, rgba(59, 130, 246, 0.06), transparent 40%),
        radial-gradient(circle at 80% 30%, rgba(168, 85, 247, 0.05), transparent 40%),
        radial-gradient(circle at 50% 100%, rgba(16, 185, 129, 0.04), transparent 50%),
        linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 100% 100%, 56px 56px, 56px 56px;
    pointer-events: none;
}

/* ===== Navigation ===== */
.nav {
    position: sticky;
    top: 0;
    z-index: 80;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    background: rgba(10, 10, 15, 0.7);
    border-bottom: 1px solid var(--border);
}

.nav-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.08em;
    color: var(--text);
}

.brand-mark {
    width: 26px;
    height: 26px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--efficiency), var(--specialist));
    display: inline-grid;
    place-items: center;
    color: white;
    font-size: 0.78rem;
    font-weight: 700;
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.35);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.18s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
}

.nav-icon {
    display: inline-flex;
    width: 20px;
    height: 20px;
}

.nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border-strong);
    color: var(--text);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.18s ease;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--efficiency), #2563eb);
    color: #fff;
    box-shadow: 0 4px 18px rgba(59, 130, 246, 0.32);
}

.btn-primary:hover {
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
    border-color: var(--border-strong);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text);
    border-color: rgba(255, 255, 255, 0.24);
}

.btn-lg {
    padding: 14px 26px;
    font-size: 1rem;
}

.btn-sm {
    padding: 7px 14px;
    font-size: 0.82rem;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    padding: 96px 0 80px;
    overflow: hidden;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface-soft);
    font-size: 0.78rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.hero-eyebrow::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--quality);
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
}

.hero h1 {
    font-size: clamp(2.4rem, 5.6vw, 4rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.02em;
    margin: 18px 0 16px;
    background: linear-gradient(135deg, #ffffff 30%, #a3a3b8 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-tagline {
    font-size: clamp(1.1rem, 2.2vw, 1.4rem);
    color: var(--text);
    font-weight: 500;
    max-width: 720px;
    margin-bottom: 18px;
}

.hero-sub {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 680px;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero-grid-bg {
    position: absolute;
    top: -10%;
    left: 50%;
    transform: translateX(-50%);
    width: 1400px;
    max-width: 140vw;
    height: 700px;
    background:
        radial-gradient(circle at 30% 20%, rgba(59, 130, 246, 0.18), transparent 45%),
        radial-gradient(circle at 70% 60%, rgba(168, 85, 247, 0.14), transparent 45%);
    filter: blur(60px);
    z-index: -1;
    pointer-events: none;
}

/* ===== Sections ===== */
.section {
    padding: 80px 0;
    position: relative;
}

.section-eyebrow {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.8rem, 3.6vw, 2.6rem);
    font-weight: 700;
    letter-spacing: -0.015em;
    color: var(--text);
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 700px;
    margin-bottom: 48px;
}

/* ===== Tier cards ===== */
.tier-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.tier-card {
    position: relative;
    padding: 28px;
    border-radius: var(--radius);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
    border: 1px solid var(--border);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.tier-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.tier-card:hover {
    transform: translateY(-2px);
    border-color: var(--border-strong);
}

.tier-card:hover::before { opacity: 1; }

.tier-card.efficiency::before { background: radial-gradient(at top right, rgba(59, 130, 246, 0.12), transparent 60%); }
.tier-card.quality::before    { background: radial-gradient(at top right, rgba(16, 185, 129, 0.12), transparent 60%); }
.tier-card.specialist::before { background: radial-gradient(at top right, rgba(168, 85, 247, 0.14), transparent 60%); }

.tier-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.tier-badge.efficiency { background: rgba(59, 130, 246, 0.14); color: var(--efficiency); border: 1px solid rgba(59, 130, 246, 0.32); }
.tier-badge.quality    { background: rgba(16, 185, 129, 0.14); color: var(--quality);    border: 1px solid rgba(16, 185, 129, 0.32); }
.tier-badge.specialist { background: rgba(168, 85, 247, 0.14); color: var(--specialist); border: 1px solid rgba(168, 85, 247, 0.32); }

.tier-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
}

.tier-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 18px;
}

.tier-models {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.tier-models li {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--text);
    padding: 8px 12px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
}

/* ===== Why grid ===== */
.why-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.why-card {
    padding: 22px;
    border-radius: var(--radius);
    background: var(--surface-soft);
    border: 1px solid var(--border);
}

.why-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(59, 130, 246, 0.12);
    color: var(--efficiency);
    display: grid;
    place-items: center;
    margin-bottom: 14px;
}

.why-card h4 {
    font-size: 1rem;
    color: var(--text);
    margin-bottom: 6px;
    font-weight: 600;
}

.why-card p {
    color: var(--text-muted);
    font-size: 0.88rem;
}

/* ===== Benchmark mini-table ===== */
.bench-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    padding: 24px;
    border-radius: var(--radius);
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.06), transparent);
    border: 1px solid var(--border);
}

.bench-cell {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
}

.bench-tps {
    font-family: var(--font-mono);
    font-size: 1.7rem;
    color: var(--efficiency);
    font-weight: 700;
    letter-spacing: -0.01em;
}

.bench-name {
    font-size: 0.85rem;
    color: var(--text);
    font-weight: 500;
}

.bench-meta {
    font-size: 0.75rem;
    color: var(--text-dim);
    font-family: var(--font-mono);
}

/* ===== Tables ===== */
.table-wrap {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface-soft);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.table th, .table td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    background: rgba(255, 255, 255, 0.03);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-size: 0.74rem;
}

.table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.table tbody tr:last-child td { border-bottom: none; }

.tps {
    font-family: var(--font-mono);
    color: var(--efficiency);
    font-weight: 600;
}

.tps-zen5 { color: var(--quality); }

.delta-pos { color: var(--quality); font-weight: 600; }

.cell-mono { font-family: var(--font-mono); font-size: 0.85rem; }

/* ===== Hardware section ===== */
.hw-callout {
    padding: 28px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.06), rgba(59, 130, 246, 0.04));
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.hw-callout h3 {
    font-size: 1.3rem;
    margin-bottom: 6px;
    color: var(--text);
}

.hw-callout p {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 540px;
}

/* ===== Get involved ===== */
.involve-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.involve-card {
    padding: 28px;
    border-radius: var(--radius);
    background: var(--surface-soft);
    border: 1px solid var(--border);
}

.involve-card h3 {
    font-size: 1.2rem;
    color: var(--text);
    margin-bottom: 8px;
}

.involve-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

/* ===== License pills ===== */
.lic {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    font-weight: 600;
    border: 1px solid var(--border);
}

.lic.mit      { background: rgba(59, 130, 246, 0.10); color: #93c5fd; border-color: rgba(59, 130, 246, 0.30); }
.lic.apache   { background: rgba(16, 185, 129, 0.10); color: #6ee7b7; border-color: rgba(16, 185, 129, 0.30); }
.lic.falcon   { background: rgba(168, 85, 247, 0.10); color: #c4b5fd; border-color: rgba(168, 85, 247, 0.30); }
.lic.excluded { background: rgba(239, 68, 68, 0.10);  color: #fca5a5; border-color: rgba(239, 68, 68, 0.30); }

/* ===== Tabs (models page) ===== */
.tabs {
    display: inline-flex;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 4px;
    gap: 4px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.tab {
    padding: 10px 18px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.18s ease;
    font-family: var(--font-sans);
}

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

.tab.active {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text);
}

.tab.active.efficiency { background: rgba(59, 130, 246, 0.16); color: var(--efficiency); }
.tab.active.quality    { background: rgba(16, 185, 129, 0.16); color: var(--quality); }
.tab.active.specialist { background: rgba(168, 85, 247, 0.16); color: var(--specialist); }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== Model cards ===== */
.model-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.model-card {
    padding: 22px;
    border-radius: var(--radius);
    background: var(--surface-soft);
    border: 1px solid var(--border);
    transition: border-color 0.18s ease;
}

.model-card:hover { border-color: var(--border-strong); }

.model-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
    gap: 10px;
}

.model-name {
    font-size: 1.02rem;
    color: var(--text);
    font-weight: 600;
}

.model-id {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-dim);
    margin-bottom: 14px;
}

.model-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 14px;
}

.model-stat {
    font-size: 0.78rem;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.model-stat strong { color: var(--text); }

.model-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--accent);
}

/* ===== Methodology card ===== */
.method-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.method-card {
    padding: 20px;
    border-radius: var(--radius);
    background: var(--surface-soft);
    border: 1px solid var(--border);
}

.method-label {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
}

.method-value {
    font-size: 1.1rem;
    color: var(--text);
    font-weight: 600;
}

/* ===== Disclaimer / notes ===== */
.note {
    padding: 16px 20px;
    border-radius: var(--radius);
    background: rgba(245, 158, 11, 0.06);
    border: 1px solid rgba(245, 158, 11, 0.24);
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.55;
}

.note strong { color: #fcd34d; }

.note.info {
    background: rgba(59, 130, 246, 0.06);
    border-color: rgba(59, 130, 246, 0.24);
}

.note.info strong { color: #93c5fd; }

/* ===== Footer ===== */
.footer {
    padding: 56px 0 32px;
    border-top: 1px solid var(--border);
    margin-top: 80px;
    background: var(--bg-elev-1);
}

.footer-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 36px;
    margin-bottom: 36px;
}

.footer-brand .brand { margin-bottom: 12px; }

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
    max-width: 320px;
}

.footer-col h5 {
    font-size: 0.78rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 14px;
    font-weight: 600;
}

.footer-col a {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.footer-col a:hover { color: var(--text); }

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    font-size: 0.85rem;
    flex-wrap: wrap;
    gap: 12px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .tier-grid     { grid-template-columns: 1fr; }
    .why-grid      { grid-template-columns: repeat(2, 1fr); }
    .bench-strip   { grid-template-columns: repeat(2, 1fr); }
    .involve-grid  { grid-template-columns: 1fr; }
    .method-grid   { grid-template-columns: 1fr; }
    .footer-row    { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-links.open {
        display: flex;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        padding: 12px 24px;
        background: rgba(10, 10, 15, 0.96);
        backdrop-filter: blur(14px);
        border-bottom: 1px solid var(--border);
    }
    .nav-links.open a {
        padding: 12px 0;
        border-bottom: 1px solid var(--border);
        font-size: 1rem;
    }
    .nav-links.open a:last-child { border-bottom: none; }
    .nav-toggle { display: inline-flex; }

    .hero { padding: 64px 0 56px; }
    .section { padding: 56px 0; }

    .why-grid     { grid-template-columns: 1fr; }
    .bench-strip  { grid-template-columns: 1fr; }
    .model-grid   { grid-template-columns: 1fr; }
    .footer-row   { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}