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

:root {
    --bg: #fafbfc;
    --bg-alt: #f4f5f8;
    --surface: #ffffff;
    --ink: #11141c;
    --ink-head: #1e293b;
    --ink-soft: #5b6072;
    --line: #eceef2;
    --line-soft: #f1f2f6;
    --accent: #2563eb;
    --accent-ink: #1d4ed8;
    --accent-soft: #eef4ff;
    --radius: 18px;
    --radius-sm: 12px;
    --shadow-card: 0 1px 2px rgba(17, 20, 28, 0.04), 0 12px 32px -16px rgba(17, 20, 28, 0.14);
    --shadow-float: 0 30px 70px -30px rgba(15, 23, 42, 0.32);
}

body {
    font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC",
        "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 28px;
}

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

/* header */

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(250, 251, 252, 0.78);
    backdrop-filter: saturate(1.6) blur(14px);
    -webkit-backdrop-filter: saturate(1.6) blur(14px);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 650;
    letter-spacing: 0.01em;
    color: var(--ink);
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    color: var(--accent-ink);
}
.brand-mark svg { width: 100%; height: 100%; display: block; }
.site-footer .brand-mark { color: #fff; }

.auth-nav { display: flex; align-items: center; gap: 10px; }

.link-plain {
    font-size: 14px;
    font-weight: 500;
    color: var(--ink-soft);
    padding: 8px 14px;
    border-radius: 10px;
    transition: color .18s ease, background-color .18s ease;
}
.link-plain:hover { color: var(--ink); background: var(--bg-alt); }

.btn-outline {
    font-size: 14px;
    font-weight: 550;
    padding: 9px 18px;
    color: #fff;
    background: var(--ink);
    border-radius: 11px;
    transition: transform .18s ease, box-shadow .18s ease, background-color .18s ease;
}
.btn-outline:hover {
    background: #000;
    transform: translateY(-1px);
    box-shadow: 0 10px 24px -12px rgba(17, 20, 28, 0.6);
}

/* hero */

.hero {
    position: relative;
    padding: 24px 0 56px;
    text-align: center;
    overflow: hidden;
}

.visually-hidden {
    position: absolute;
    width: 1px; height: 1px;
    margin: -1px; padding: 0; border: 0;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    overflow: hidden;
    white-space: nowrap;
}

.hero::before {
    content: "";
    position: absolute;
    top: -140px;
    left: 50%;
    transform: translateX(-50%);
    width: 760px;
    height: 760px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.12), rgba(37, 99, 235, 0) 68%);
    pointer-events: none;
}

.hero-inner {
    position: relative;
    z-index: 1;
    max-width: 740px;
    margin: 0 auto;
}

.eyebrow {
    display: inline-block;
    font-size: 12.5px;
    font-weight: 550;
    letter-spacing: 0.04em;
    color: var(--accent-ink);
    background: var(--accent-soft);
    border: 1px solid rgba(37, 99, 235, 0.18);
    padding: 6px 14px;
    border-radius: 999px;
    margin-bottom: 26px;
}

.hero h1 {
    font-size: 54px;
    font-weight: 720;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 22px;
    color: var(--ink-head);
}

.hero h1 .grad {
    background: linear-gradient(100deg, #3b82f6, #1d4ed8 55%, #0ea5e9);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-sub {
    font-size: 17px;
    color: var(--ink-soft);
    max-width: 580px;
    margin: 0 auto 36px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
}

.btn-fill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    padding: 13px 26px;
    color: #fff;
    background: var(--accent);
    border-radius: 13px;
    box-shadow: 0 14px 30px -12px rgba(37, 99, 235, 0.6);
    transition: transform .18s ease, box-shadow .18s ease, background-color .18s ease;
}
.btn-fill:hover { transform: translateY(-2px); background: var(--accent-ink); box-shadow: 0 20px 40px -14px rgba(37, 99, 235, 0.7); }

.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 15px;
    font-weight: 550;
    padding: 13px 22px;
    color: var(--ink);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 13px;
    transition: border-color .18s ease, background-color .18s ease;
}
.btn-ghost:hover { border-color: #d7dae2; background: var(--bg-alt); }

/* hero ring stage */

.hero-stage-wrap {
    position: relative;
    z-index: 1;
    /* full-bleed: break out of the container to span the viewport */
    width: 100vw;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
    aspect-ratio: 2962 / 2160;
    max-height: 86vh;
    margin-top: -8px;
    margin-bottom: -8px;
}

.hero-stage {
    display: block;
    width: 100%;
    height: 100%;
    /* flip the ring's black field to white so it melts into the light page */
    filter: invert(1) hue-rotate(180deg) contrast(0.92) brightness(1.05);
}

/* section head */

.section-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px;
}

.section-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.16em;
    color: var(--accent-ink);
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-head h2 {
    font-size: 34px;
    font-weight: 700;
    letter-spacing: -0.015em;
    color: var(--ink-head);
    margin-bottom: 14px;
}

.section-head p {
    font-size: 16px;
    color: var(--ink-soft);
}

/* features — light panel with a soft blue aura echoing the ring */

.features {
    position: relative;
    padding: 92px 0 100px;
    background:
        radial-gradient(900px 440px at 50% -8%, rgba(37, 99, 235, 0.08), rgba(37, 99, 235, 0) 70%),
        radial-gradient(680px 380px at 88% 112%, rgba(14, 165, 233, 0.07), rgba(14, 165, 233, 0) 70%),
        linear-gradient(180deg, #ffffff, #f6f8fc 60%, #ffffff);
    overflow: hidden;
}

.feature-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.feature-card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 30px 26px;
    box-shadow: var(--shadow-card);
    transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(37, 99, 235, 0.3);
    box-shadow: 0 28px 56px -28px rgba(37, 99, 235, 0.3);
}

.feature-icon {
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(140deg, rgba(37, 99, 235, 0.12), rgba(14, 165, 233, 0.08));
    border: 1px solid rgba(37, 99, 235, 0.14);
    color: var(--accent-ink);
    margin-bottom: 20px;
}
.feature-icon svg { width: 24px; height: 24px; display: block; }

.feature-card h3 {
    font-size: 18px;
    font-weight: 650;
    color: var(--ink-head);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14.5px;
    color: var(--ink-soft);
}

/* stats */

.stats {
    padding: 20px 0 72px;
}

.stats-inner {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
}

.stat {
    background: var(--surface);
    padding: 30px 22px;
    text-align: center;
}

.stat-num {
    font-size: 30px;
    font-weight: 720;
    letter-spacing: -0.02em;
    color: var(--accent-ink);
    margin-bottom: 6px;
}

.stat-label {
    font-size: 13.5px;
    color: var(--ink-soft);
}

/* process */

.process {
    padding: 80px 0;
    background: var(--bg-alt);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.process-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.process-list li {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px 22px;
    box-shadow: var(--shadow-card);
}

.process-num {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    color: var(--accent-ink);
    background: var(--accent-soft);
    border-radius: 8px;
    padding: 3px 10px;
    margin-bottom: 16px;
}

.process-body h3 {
    font-size: 17px;
    font-weight: 650;
    color: var(--ink-head);
    margin-bottom: 9px;
}

.process-body p {
    font-size: 14px;
    color: var(--ink-soft);
}

/* roles */

.roles { padding: 80px 0; }

.role-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.role-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 30px 24px;
    box-shadow: var(--shadow-card);
    transition: transform .2s ease, box-shadow .2s ease;
}
.role-card:hover { transform: translateY(-4px); box-shadow: 0 20px 44px -22px rgba(15, 23, 42, 0.4); }

.role-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--accent-ink);
    background: var(--accent-soft);
    border-radius: 999px;
    padding: 4px 12px;
    margin-bottom: 18px;
}

.role-card h3 {
    font-size: 18px;
    font-weight: 650;
    color: var(--ink-head);
    margin-bottom: 10px;
}

.role-card p {
    font-size: 14px;
    color: var(--ink-soft);
}

/* footer */

.site-footer {
    padding: 40px 0;
    background: var(--ink-head);
    color: rgba(255, 255, 255, 0.72);
    font-size: 13.5px;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.footer-inner .brand { color: #fff; }

/* responsive */

@media (max-width: 920px) {
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .process-list { grid-template-columns: repeat(2, 1fr); }
    .role-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-inner { grid-template-columns: repeat(2, 1fr); }
    .hero h1 { font-size: 40px; }
}

@media (max-width: 540px) {
    .feature-grid, .process-list, .role-grid, .stats-inner { grid-template-columns: 1fr; }
    .hero h1 { font-size: 32px; }
    .hero-actions { flex-direction: column; }
    .footer-inner { flex-direction: column; text-align: center; }
}