:root {
    --font-body: 'IBM Plex Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-display: 'Noto Serif SC', 'Songti SC', serif;
    --font-mono: 'JetBrains Mono', 'Cascadia Mono', monospace;

    --bg: #f7f9fc;
    --bg-soft: #f1f4f8;
    --bg-panel: rgba(255, 255, 255, 0.82);
    --bg-panel-strong: #ffffff;
    --text: #16202b;
    --text-soft: #526171;
    --text-faint: #738294;
    --line: rgba(22, 32, 43, 0.1);
    --line-strong: rgba(22, 32, 43, 0.14);
    --accent: #42688c;
    --accent-strong: #355777;
    --accent-alt: #1f2c39;
    --shadow: 0 18px 50px rgba(66, 104, 140, 0.1);
    --shadow-soft: 0 10px 24px rgba(66, 104, 140, 0.06);
    --radius-xl: 28px;
    --radius-lg: 22px;
    --radius-md: 16px;
    --container: 1200px;
    --nav-height: 78px;
}

[data-theme="dark"] {
    --bg: #0a0a0f;
    --bg-soft: #111118;
    --bg-panel: rgba(26, 26, 36, 0.82);
    --bg-panel-strong: #1a1a24;
    --text: #f5f5f7;
    --text-soft: #a1a1aa;
    --text-faint: #71717a;
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.14);
    --accent: #7f9fbe;
    --accent-strong: #98b4cf;
    --accent-alt: #dbe4ee;
    --shadow: 0 22px 70px rgba(0, 0, 0, 0.42);
    --shadow-soft: 0 14px 36px rgba(0, 0, 0, 0.28);
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-body);
    background:
        radial-gradient(circle at top left, rgba(66, 104, 140, 0.05), transparent 24%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
    color: var(--text);
    line-height: 1.65;
    min-width: 320px;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: radial-gradient(circle at center, black 45%, transparent 100%);
    opacity: 0.3;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font: inherit;
}

.container {
    width: min(var(--container), calc(100% - 40px));
    margin: 0 auto;
}

.nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(18px);
    background: color-mix(in srgb, var(--bg) 78%, transparent);
    border-bottom: 1px solid var(--line);
}

.nav-inner {
    width: min(var(--container), calc(100% - 40px));
    margin: 0 auto;
    min-height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    gap: 14px;
}

.brand-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    color: #ffffff;
    background: #4b6782;
    box-shadow: var(--shadow-soft);
}

.brand-icon [data-lucide] {
    width: 24px;
    height: 24px;
    stroke-width: 2.2;
}

.brand-word {
    display: grid;
    gap: 2px;
}

.brand-word strong {
    font-size: 1.05rem;
    letter-spacing: 0.01em;
}

.brand-word small {
    color: var(--text-faint);
    font-size: 0.76rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 22px;
}

.nav-links a {
    color: var(--text-soft);
    font-size: 0.95rem;
}

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

.nav-doc-link {
    color: var(--accent) !important;
    font-weight: 700;
}

.nav-cta,
.theme-toggle,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border-radius: 999px;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.nav-cta {
    padding: 11px 18px;
    border: 1px solid var(--line-strong);
    background: color-mix(in srgb, var(--bg-panel) 92%, #eef2f6);
    box-shadow: var(--shadow-soft);
    font-weight: 600;
    color: var(--text-soft);
}

.nav-cta:hover,
.btn:hover,
.theme-toggle:hover {
    transform: translateY(-1px);
}

.nav-cta:hover,
.theme-toggle:hover,
.nav-mobile-toggle:hover {
    border-color: color-mix(in srgb, var(--accent) 25%, var(--line));
    color: var(--text);
}

.theme-toggle,
.nav-mobile-toggle {
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--bg-panel) 92%, #eef2f6);
    color: var(--text-soft);
    box-shadow: var(--shadow-soft);
    cursor: pointer;
}

.nav-mobile-toggle {
    display: none;
}

.icon-sun,
[data-theme="dark"] .icon-moon {
    display: inline-flex;
}

.icon-moon,
[data-theme="dark"] .icon-sun {
    display: none;
}

.nav-mobile {
    display: none;
}

.hero {
    padding: 48px 0 20px;
}

.hero-grid,
.start-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
    gap: 28px;
    align-items: start;
}

.hero-copy,
.hero-runtime,
.section-head,
.manifesto-card,
.ladder-step,
.capability-card,
.release-strip,
.arch-diagram,
.arch-card,
.matrix-card,
.start-copy,
.start-panel {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.eyebrow,
.section-label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 7px 14px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--accent) 10%, var(--bg-panel-strong));
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    border: 1px solid color-mix(in srgb, var(--accent) 20%, var(--line));
}

.hero-kicker {
    margin: 14px 0 8px;
    color: var(--text-soft);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 0.8rem;
}

.hero h1,
.section-head h2 {
    margin: 0;
    font-family: var(--font-display);
    letter-spacing: -0.03em;
    line-height: 1.08;
}

.hero h1 {
    max-width: 12ch;
    font-size: clamp(2.4rem, 5vw, 4rem);
}

.hero-lead,
.section-head p,
.manifesto-card p,
.capability-card p,
.arch-card p,
.matrix-card p,
.start-list,
.footer-brand small {
    color: var(--text-soft);
}

.hero-lead {
    max-width: 62ch;
    margin: 18px 0 14px;
    font-size: 1rem;
}

.hero-quote {
    margin: 0 0 22px;
    padding-left: 18px;
    border-left: 3px solid color-mix(in srgb, var(--accent) 60%, transparent);
    color: var(--text);
    font-size: 0.96rem;
}

.hero-actions,
.download-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.btn {
    padding: 13px 20px;
    border: 1px solid transparent;
    font-weight: 700;
}

.btn-primary {
    background: #4b6782;
    color: #ffffff;
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--bg-panel);
    border-color: var(--line-strong);
    box-shadow: var(--shadow-soft);
}

.btn-ghost {
    border-color: var(--line);
}

.hero-metrics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 24px;
}

.metric {
    padding: 16px 14px;
    border-radius: var(--radius-md);
    background: var(--bg-panel);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
}

.metric strong {
    display: block;
    font-size: 1.35rem;
    margin-bottom: 2px;
}

.metric span {
    color: var(--text-faint);
    font-size: 0.9rem;
}

.panel {
    border-radius: var(--radius-xl);
    background: var(--bg-panel);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.runtime-panel,
.start-panel {
    padding: 22px;
}

.panel-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    font-weight: 700;
}

.panel-badge {
    color: var(--text-faint);
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.terminal {
    overflow: hidden;
    border-radius: var(--radius-lg);
    border: 1px solid var(--line);
    background: #131314;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.terminal-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: #f8efe7;
    font-size: 0.84rem;
    background: rgba(255, 255, 255, 0.04);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
}

.dot.red {
    background: #ff6d5f;
}

.dot.yellow {
    background: #f5be4f;
}

.dot.green {
    background: #28c840;
}

.terminal-body {
    display: grid;
    gap: 10px;
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 0.86rem;
    color: #f7f3ef;
}

.terminal-body code {
    white-space: pre-wrap;
    word-break: break-word;
}

.terminal-body code span {
    color: #7cc3ff;
}

.terminal-body .output {
    color: #d5c7bb;
}

.runtime-grid {
    display: grid;
    gap: 14px;
    margin-top: 16px;
}

.runtime-grid article,
.manifesto-card,
.ladder-step,
.capability-card,
.arch-card,
.matrix-card {
    padding: 20px;
    border-radius: var(--radius-lg);
    background: color-mix(in srgb, var(--bg-panel-strong) 90%, transparent);
    border: 1px solid var(--line);
}

.runtime-grid span,
.manifesto-card span,
.arch-card span {
    display: block;
    margin-bottom: 10px;
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.runtime-grid strong,
.manifesto-card h3,
.ladder-step h3,
.capability-card h3,
.arch-card h3,
.matrix-card h3,
.start-copy h2,
.release-strip h3 {
    margin: 0 0 10px;
}

.section {
    padding: 88px 0;
}

.section-alt {
    background: color-mix(in srgb, var(--bg-soft) 78%, transparent);
    border-block: 1px solid var(--line);
}

.section-head {
    max-width: 760px;
    margin-bottom: 30px;
}

.section-head h2 {
    font-size: clamp(2.1rem, 4vw, 3.5rem);
    margin-top: 16px;
}

.section-head p {
    margin-top: 16px;
    font-size: 1.04rem;
}

.manifesto-grid,
.architecture-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.manifesto-card h3,
.capability-card h3,
.arch-card h3,
.matrix-card h3 {
    font-size: 1.2rem;
}

.ladder-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 14px;
}

.ladder-step strong {
    display: block;
    margin-bottom: 18px;
    font-family: var(--font-display);
    font-size: 2.2rem;
    color: var(--accent);
}

.capability-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    margin-bottom: 24px;
}

.capability-card i {
    width: 22px;
    height: 22px;
    margin-bottom: 18px;
    color: var(--accent-alt);
}

.release-strip {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 24px;
    align-items: start;
    padding: 24px;
    border-radius: var(--radius-xl);
    border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--line));
    background: color-mix(in srgb, var(--bg-panel-strong) 94%, transparent);
    box-shadow: var(--shadow-soft);
}

.release-strip ul {
    margin: 0;
    padding-left: 18px;
    color: var(--text-soft);
}

.release-strip li + li {
    margin-top: 8px;
}

.architecture-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.arch-diagram {
    padding: 26px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--bg-panel-strong) 96%, transparent);
    box-shadow: var(--shadow-soft);
}

.arch-layer-label {
    margin-bottom: 14px;
    text-align: center;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.arch-nodes,
.arch-bottom-nodes {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.arch-node-box {
    min-width: 120px;
    padding: 14px 18px;
    text-align: center;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--bg-panel);
}

.arch-node-icon {
    margin-bottom: 6px;
    color: var(--accent);
}

.arch-node-icon [data-lucide] {
    width: 20px;
    height: 20px;
}

.arch-node-name {
    font-size: 0.92rem;
    font-weight: 700;
}

.arch-node-sub {
    margin-top: 4px;
    color: var(--text-faint);
    font-size: 0.77rem;
    line-height: 1.45;
}

.arch-arrow-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 10px 0;
    color: var(--accent);
}

.arch-arrow-block span {
    color: var(--text-faint);
    font-size: 0.78rem;
    font-weight: 600;
}

.arch-core-panel {
    padding: 22px;
    border-radius: 18px;
    border: 1px solid color-mix(in srgb, var(--accent) 18%, var(--line));
    background: color-mix(in srgb, var(--bg-soft) 60%, var(--bg-panel-strong));
}

.arch-core-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 18px;
}

.arch-badge {
    padding: 6px 12px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--accent) 12%, var(--bg-panel-strong));
    color: var(--accent);
    border: 1px solid color-mix(in srgb, var(--accent) 20%, var(--line));
    font-size: 0.78rem;
    font-weight: 700;
}

.arch-badge-alt {
    color: #059669;
    border-color: rgba(5, 150, 105, 0.18);
    background: rgba(5, 150, 105, 0.08);
}

.arch-loop-box {
    padding: 18px;
    margin-bottom: 18px;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: var(--bg-panel);
}

.arch-loop-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 14px;
    color: var(--accent);
    font-size: 0.94rem;
    font-weight: 800;
}

.arch-loop-flow {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.arch-loop-step {
    min-width: 94px;
    padding: 12px 16px;
    text-align: center;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--bg-panel-strong) 92%, transparent);
}

.arch-loop-icon {
    margin-bottom: 6px;
    color: var(--accent);
}

.arch-loop-text {
    font-size: 0.8rem;
    font-weight: 700;
    white-space: nowrap;
}

.arch-loop-next {
    color: var(--accent);
}

.arch-mod-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.arch-mod-card {
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--bg-panel);
}

.arch-mod-name {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
    font-size: 0.86rem;
    font-weight: 800;
    color: var(--text);
}

.arch-mod-desc {
    color: var(--text-faint);
    font-size: 0.78rem;
    line-height: 1.5;
}

.arch-node-box-db {
    border-color: rgba(217, 119, 6, 0.22);
}

.arch-node-box-llm {
    border-color: color-mix(in srgb, var(--accent) 30%, var(--line));
}

.arch-stats-strip {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 20px;
}

.arch-stat {
    padding: 14px;
    text-align: center;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--bg-panel);
}

.arch-stat strong {
    display: block;
    color: var(--accent);
    font-size: 1.4rem;
    margin-bottom: 4px;
}

.arch-stat span {
    color: var(--text-faint);
    font-size: 0.84rem;
}

.matrix-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.start-list {
    margin: 18px 0 28px;
    padding-left: 20px;
}

.start-list li + li {
    margin-top: 10px;
}

.footer {
    padding: 36px 0 16px;
}

.footer-grid {
    display: flex;
    justify-content: space-between;
    gap: 28px;
    padding-top: 14px;
}

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

.footer-slogan {
    color: var(--text-faint);
    font-style: italic;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, minmax(120px, 1fr));
    gap: 28px;
}

.footer-links h4 {
    margin: 0 0 12px;
}

.footer-links a {
    display: block;
    color: var(--text-soft);
    margin-bottom: 8px;
}

.footer-bottom {
    margin-top: 26px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    text-align: center;
    color: var(--text-faint);
    font-size: 0.92rem;
}

@media (max-width: 1100px) {
    .hero-grid,
    .start-grid {
        grid-template-columns: 1fr;
    }

    .manifesto-grid,
    .capability-grid,
    .architecture-grid,
    .matrix-grid,
    .release-strip {
        grid-template-columns: 1fr 1fr;
    }

    .arch-mod-grid,
    .arch-stats-strip {
        grid-template-columns: 1fr 1fr;
    }

    .ladder-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .hero h1 {
        max-width: none;
    }
}

@media (max-width: 820px) {
    .nav-links {
        display: none;
    }

    .nav-mobile-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .nav-mobile {
        width: min(var(--container), calc(100% - 40px));
        margin: 0 auto 14px;
        padding: 14px;
        border-radius: var(--radius-lg);
        border: 1px solid var(--line);
        background: var(--bg-panel);
        box-shadow: var(--shadow-soft);
    }

    .nav-mobile.open {
        display: grid;
        gap: 10px;
    }

    .hero {
        padding-top: 34px;
    }

    .hero-metrics,
    .manifesto-grid,
    .capability-grid,
    .release-strip,
    .architecture-grid,
    .matrix-grid,
    .arch-mod-grid,
    .arch-stats-strip,
    .footer-grid,
    .footer-links {
        grid-template-columns: 1fr;
        display: grid;
    }

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

    .footer-grid {
        gap: 24px;
    }
}

@media (max-width: 560px) {
    .container,
    .nav-inner {
        width: min(var(--container), calc(100% - 28px));
    }

    .hero h1 {
        font-size: 2.6rem;
    }

    .section {
        padding: 68px 0;
    }

    .hero-actions,
    .download-actions {
        flex-direction: column;
    }

    .btn,
    .nav-cta {
        width: 100%;
    }

    .hero-metrics,
    .ladder-grid {
        grid-template-columns: 1fr;
    }

    .runtime-panel,
    .start-panel,
    .manifesto-card,
    .ladder-step,
    .capability-card,
    .arch-diagram,
    .arch-card,
    .matrix-card {
        padding: 18px;
    }

    .arch-core-panel,
    .arch-loop-box,
    .arch-mod-card,
    .arch-node-box,
    .arch-stat {
        padding: 14px;
    }
}