/* ========================================
   RUEDU 睿度科创 — 官方网站样式
   ======================================== */

/* ── RESET ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
    color: #1a1a2e;
    background: #fafafa;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* ── COLORS ── */
:root {
    --pri: #4f46e5;
    --pri-dark: #3730a3;
    --pri-light: #e0e7ff;
    --sec: #0ea5e9;
    --dark: #0f172a;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gradient: linear-gradient(135deg, #4f46e5 0%, #0ea5e9 50%, #06b6d4 100%);
    --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
    --shadow-md: 0 4px 24px rgba(0,0,0,.08);
    --shadow-lg: 0 12px 48px rgba(0,0,0,.1);
    --radius: 16px;
    --radius-sm: 10px;
}

/* ── CONTAINER ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ── SECTION HEADER ── */
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--pri);
    background: var(--pri-light);
    padding: 6px 16px;
    border-radius: 50px;
    margin-bottom: 16px;
}
.section-header h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--dark);
    line-height: 1.3;
}
.section-desc {
    font-size: 1.1rem;
    color: var(--gray-500);
    max-width: 640px;
    margin: 12px auto 0;
}
section { padding: 100px 0; }

/* ── NAV ── */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(255,255,255,.82);
    border-bottom: 1px solid rgba(0,0,0,.06);
    transition: all 0.3s;
}
.nav.scrolled { box-shadow: var(--shadow-sm); }
.nav-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 68px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-icon { font-size: 1.6rem; color: var(--pri); }
.logo-text { font-size: 1.25rem; font-weight: 800; color: var(--dark); }
.logo-sub {
    font-size: 0.7rem; font-weight: 500; color: var(--gray-400);
    margin-left: 6px;
    letter-spacing: 0.05em;
}
.nav-links { display: flex; list-style: none; gap: 8px; align-items: center; }
.nav-links a {
    text-decoration: none; color: var(--gray-600);
    font-size: 0.9rem; font-weight: 500; padding: 8px 14px; border-radius: 8px;
    transition: all 0.2s;
}
.nav-links a:hover { color: var(--pri); background: var(--pri-light); }
.nav-cta {
    background: var(--pri) !important; color: #fff !important;
    padding: 8px 20px !important; border-radius: 50px !important;
    font-weight: 600 !important;
}
.nav-cta:hover { background: var(--pri-dark) !important; }
.nav-links a.active-link { color: var(--pri) !important; background: var(--pri-light); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--gray-700); border-radius: 1px; transition: all 0.3s; }

/* ── HERO ── */
.hero { padding: 160px 0 120px; position: relative; overflow: hidden; }
.hero::before {
    content: '';
    position: absolute; top: -50%; left: -20%;
    width: 80%; height: 200%;
    background: radial-gradient(ellipse at center, rgba(79,70,229,.06) 0%, transparent 70%);
    pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-badge {
    display: inline-block; font-size: 0.8rem; font-weight: 600; color: var(--pri);
    background: var(--pri-light); padding: 6px 16px; border-radius: 50px; margin-bottom: 24px;
}
.hero-title {
    font-size: clamp(2rem, 5vw, 3.4rem); font-weight: 900; line-height: 1.2;
    color: var(--dark); margin-bottom: 24px;
}
.text-gradient { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 1.1rem; color: var(--gray-500); margin-bottom: 32px; max-width: 520px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 36px; }
.hero-features {
    display: flex; gap: 24px; flex-wrap: wrap;
    font-size: 0.85rem; font-weight: 600; color: var(--gray-500);
}
.hero-visual { display: flex; justify-content: center; }
.hero-box { text-align: center; }
.hero-box-inner {
    width: 320px; height: 320px; position: relative;
    display: flex; align-items: center; justify-content: center;
}
.box-glow {
    position: absolute; width: 200px; height: 200px;
    background: var(--gradient); border-radius: 50%; filter: blur(80px); opacity: 0.35;
    animation: pulse 3s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.35; }
    50% { transform: scale(1.15); opacity: 0.5; }
}
.box-cube {
    position: relative; z-index: 1;
    width: 140px; height: 140px;
    transform: rotateX(-25deg) rotateY(30deg);
    transform-style: preserve-3d;
    animation: float 6s ease-in-out infinite;
}
@keyframes float {
    0%, 100% { transform: rotateX(-25deg) rotateY(30deg) translateY(0); }
    50% { transform: rotateX(-25deg) rotateY(30deg) translateY(-12px); }
}
.cube-face {
    position: absolute;
    width: 140px; height: 140px;
    border: 2px solid rgba(79,70,229,.25);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 1.1rem; color: var(--pri);
    backdrop-filter: blur(10px);
}
.cube-face.front { background: rgba(255,255,255,.7); transform: translateZ(70px); }
.cube-face.top { background: rgba(224,231,255,.6); transform: rotateX(90deg) translateZ(70px); }
.cube-face.right { background: rgba(224,231,255,.4); transform: rotateY(90deg) translateZ(70px); }
.box-label { margin-top: 20px; font-size: 0.9rem; color: var(--gray-400); font-weight: 500; }

/* ── BUTTONS ── */
.btn { display: inline-block; padding: 14px 32px; border-radius: 50px; font-size: 0.95rem; font-weight: 600; text-decoration: none; cursor: pointer; transition: all 0.3s; border: none; }
.btn-primary { background: var(--pri); color: #fff; box-shadow: 0 4px 16px rgba(79,70,229,.25); }
.btn-primary:hover { background: var(--pri-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(79,70,229,.35); }
.btn-outline { background: transparent; color: var(--pri); border: 2px solid var(--pri-light); }
.btn-outline:hover { background: var(--pri-light); }
.btn-lg { padding: 18px 48px; font-size: 1.05rem; }

/* ── PAINS ── */
.pains { background: var(--gray-50); }
.pains-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.pain-card {
    background: #fff; border-radius: var(--radius); padding: 36px 28px;
    box-shadow: var(--shadow-sm); transition: all 0.3s;
    border: 1px solid transparent;
}
.pain-card:hover { box-shadow: var(--shadow-md); border-color: var(--gray-200); transform: translateY(-4px); }
.pain-number {
    font-size: 2.5rem; font-weight: 900; color: var(--pri-light);
    margin-bottom: 12px; line-height: 1;
}
.pain-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; color: var(--dark); }
.pain-card p { font-size: 0.92rem; color: var(--gray-500); line-height: 1.7; }

/* ── ARCH ── */
.arch { background: #fff; }
.arch-stack { max-width: 700px; margin: 0 auto; display: flex; flex-direction: column; gap: 0; }
.arch-layer {
    padding: 32px; border-radius: var(--radius);
    position: relative;
    transition: all 0.3s;
}
.arch-layer:hover { transform: translateX(8px); }
.layer-app { background: linear-gradient(135deg, #eef2ff, #e0e7ff); border: 2px solid #c7d2fe; margin-bottom: -6px; z-index: 3; }
.layer-router { background: linear-gradient(135deg, #ecfeff, #cffafe); border: 2px solid #a5f3fc; margin-bottom: -6px; z-index: 2; }
.layer-hardware { background: linear-gradient(135deg, #f5f3ff, #ede9fe); border: 2px solid #ddd6fe; z-index: 1; }
.layer-label {
    font-size: 0.75rem; font-weight: 700; letter-spacing: 0.06em;
    color: var(--pri); margin-bottom: 8px;
}
.layer-content h4 { font-size: 1.15rem; font-weight: 700; margin-bottom: 6px; color: var(--dark); }
.layer-content p { font-size: 0.93rem; color: var(--gray-500); }
.arch-note {
    text-align: center; margin-top: 32px; padding: 16px 24px;
    background: var(--pri-light); border-radius: 50px;
    font-size: 0.95rem; color: var(--pri-dark); font-weight: 500;
    max-width: 500px; margin-left: auto; margin-right: auto;
}

/* ── ROUTER ── */
.router { background: var(--gray-50); }
.router-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.router-item {
    background: #fff; border-radius: var(--radius); padding: 32px 24px;
    text-align: center; box-shadow: var(--shadow-sm); transition: all 0.3s;
}
.router-item:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.router-icon { font-size: 2.5rem; margin-bottom: 16px; }
.router-item h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
.router-item p { font-size: 0.88rem; color: var(--gray-500); }

/* ── PRODUCTS ── */
.products { background: #fff; }
.products-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
    align-items: stretch; margin-bottom: 32px;
}
.product-card {
    background: var(--gray-50); border-radius: var(--radius); padding: 40px 32px;
    border: 2px solid var(--gray-200); transition: all 0.3s; position: relative;
    display: flex; flex-direction: column;
}
.product-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.product-card.featured {
    background: #fff; border-color: var(--pri);
    box-shadow: 0 8px 40px rgba(79,70,229,.12);
    transform: scale(1.03);
}
.product-card.featured:hover { transform: scale(1.03) translateY(-4px); }
.product-badge {
    position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
    background: var(--pri); color: #fff; font-size: 0.8rem; font-weight: 700;
    padding: 6px 20px; border-radius: 50px;
}
.product-tier {
    font-size: 0.8rem; font-weight: 600; color: var(--pri); letter-spacing: 0.08em;
    text-transform: uppercase; margin-bottom: 8px;
}
.product-card h3 { font-size: 1.6rem; font-weight: 800; color: var(--dark); margin-bottom: 4px; }
.product-sub { font-size: 0.65rem; color: var(--gray-400); margin-left: 8px; font-weight: 500; letter-spacing: 0.1em; }
.product-price {
    font-size: 2rem; font-weight: 900; color: var(--dark); margin: 16px 0 8px;
}
.price-note { font-size: 0.75rem; color: var(--gray-400); font-weight: 500; margin-left: 6px; }
.product-desc { font-size: 0.9rem; color: var(--gray-500); margin-bottom: 20px; }
.product-specs { list-style: none; margin-top: auto; }
.product-specs li {
    font-size: 0.88rem; color: var(--gray-600); padding: 8px 0;
    border-bottom: 1px solid var(--gray-200);
}
.product-specs li:last-child { border-bottom: none; }
.product-specs li::before { content: '✓ '; color: var(--pri); font-weight: 700; margin-right: 6px; }
.products-compare { text-align: center; color: var(--gray-500); font-size: 0.9rem; font-weight: 500; }

/* ── SKILLS ── */
.skills { background: var(--gray-50); }
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 60px; }
.skill-card {
    background: #fff; border-radius: var(--radius); padding: 32px 28px;
    box-shadow: var(--shadow-sm); transition: all 0.3s; border: 1px solid transparent;
}
.skill-card:hover { box-shadow: var(--shadow-md); border-color: var(--pri-light); transform: translateY(-4px); }
.skill-num { font-size: 2rem; font-weight: 900; color: var(--pri-light); margin-bottom: 12px; line-height: 1; }
.skill-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
.skill-card p { font-size: 0.9rem; color: var(--gray-500); line-height: 1.6; }

/* Skills Plus */
.skills-plus-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.plus-card {
    background: #fff; border-radius: var(--radius); padding: 28px 22px;
    border: 1px solid var(--gray-200); transition: all 0.3s; text-align: center;
}
.plus-card:hover { box-shadow: var(--shadow-md); border-color: var(--pri-light); }
.plus-badge {
    display: inline-block; font-size: 0.7rem; font-weight: 700; padding: 4px 10px;
    border-radius: 50px; margin-bottom: 12px;
    background: #dcfce7; color: #166534;
}
.plus-card h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
.plus-card p { font-size: 0.82rem; color: var(--gray-500); line-height: 1.6; }

/* ── SCENARIOS ── */
.scenarios { background: #fff; }
.scenarios-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.scenario-card {
    background: var(--gray-50); border-radius: var(--radius); padding: 40px 32px;
    border: 1px solid var(--gray-200); transition: all 0.3s;
}
.scenario-card:hover { box-shadow: var(--shadow-md); border-color: var(--pri-light); transform: translateY(-4px); }
.scenario-icon { font-size: 2.5rem; margin-bottom: 20px; }
.scenario-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; color: var(--dark); }
.scenario-card p { font-size: 0.93rem; color: var(--gray-500); margin-bottom: 12px; line-height: 1.6; }
.scenario-tag {
    display: inline-block; font-size: 0.78rem; font-weight: 600; color: var(--pri);
    background: var(--pri-light); padding: 4px 12px; border-radius: 50px;
}

/* ── SERVICE ── */
.service { background: var(--gray-50); }
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.service-card {
    background: #fff; border-radius: var(--radius); padding: 40px 24px;
    text-align: center; box-shadow: var(--shadow-sm); transition: all 0.3s;
}
.service-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.service-num {
    font-size: 2rem; font-weight: 900; background: var(--gradient);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text; margin-bottom: 8px;
}
.service-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--dark); margin-bottom: 6px; }
.service-card p { font-size: 0.88rem; color: var(--gray-500); }

/* ── FOUNDER ── */
.founder { background: #fff; }
.founder-card {
    max-width: 800px; margin: 0 auto;
    background: var(--gray-50); border-radius: 24px; padding: 56px;
    display: flex; gap: 40px; align-items: flex-start;
    box-shadow: var(--shadow-sm);
}
.founder-avatar { flex-shrink: 0; }
.avatar-placeholder {
    width: 100px; height: 100px; border-radius: 50%;
    background: var(--gradient);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 2.5rem; font-weight: 800;
}
.founder-text blockquote {
    font-size: 1.2rem; font-weight: 600; color: var(--dark);
    line-height: 1.7; margin: 16px 0 20px; padding-left: 20px;
    border-left: 4px solid var(--pri);
}
.founder-desc { font-size: 0.95rem; color: var(--gray-500); line-height: 1.8; margin-bottom: 20px; }
.founder-name strong { display: block; font-size: 1rem; color: var(--dark); margin-bottom: 4px; }
.founder-name span { font-size: 0.82rem; color: var(--gray-400); }

/* ── ROADMAP ── */
.roadmap { background: var(--gray-50); }
.roadmap-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.roadmap-card {
    background: #fff; border-radius: var(--radius); padding: 32px 24px;
    text-align: center; box-shadow: var(--shadow-sm); transition: all 0.3s;
    border-top: 3px solid var(--pri-light);
}
.roadmap-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.roadmap-icon { font-size: 2.2rem; margin-bottom: 16px; }
.roadmap-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; color: var(--dark); }
.roadmap-card p { font-size: 0.85rem; color: var(--gray-500); line-height: 1.6; }

/* ── CTA ── */
.cta { background: #fff; }
.cta-card {
    max-width: 720px; margin: 0 auto; text-align: center;
    background: linear-gradient(135deg, #1e1b4b, #312e81);
    border-radius: 24px; padding: 64px 48px; color: #fff;
}
.cta-card h2 { font-size: 1.9rem; font-weight: 800; margin-bottom: 16px; line-height: 1.3; }
.cta-card p { font-size: 1rem; opacity: 0.8; margin-bottom: 32px; line-height: 1.7; }
.cta-contact { display: flex; justify-content: center; gap: 32px; flex-wrap: wrap; margin-bottom: 36px; }
.contact-item { display: flex; align-items: center; gap: 8px; font-size: 0.95rem; opacity: 0.85; }
.contact-icon { font-size: 1.2rem; }

/* ── FOOTER ── */
.footer {
    background: var(--dark); color: var(--gray-400); padding: 40px 0;
    text-align: center; font-size: 0.85rem;
}
.footer-brand { display: flex; align-items: center; justify-content: center; gap: 8px; margin-bottom: 8px; }
.footer-brand span { color: #fff; font-weight: 700; font-size: 1rem; }
.footer-tagline { margin-bottom: 12px; letter-spacing: 0.05em; }
.footer-copy { color: var(--gray-500); }

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; text-align: center; }
    .hero-desc { margin: 0 auto 32px; }
    .hero-actions { justify-content: center; }
    .hero-features { justify-content: center; }
    .hero-visual { order: -1; }
    .hero-box-inner { width: 240px; height: 240px; }
    .cube-face { width: 100px; height: 100px; }
    .cube-face.front { transform: translateZ(50px); }
    .cube-face.top { transform: rotateX(90deg) translateZ(50px); }
    .cube-face.right { transform: rotateY(90deg) translateZ(50px); }

    .pains-grid { grid-template-columns: repeat(2, 1fr); }
    .products-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto 32px; }
    .product-card.featured { transform: none; }
    .product-card.featured:hover { transform: translateY(-4px); }
    .skills-grid { grid-template-columns: repeat(2, 1fr); }
    .skills-plus-grid { grid-template-columns: repeat(2, 1fr); }
    .scenarios-grid { grid-template-columns: 1fr; }
    .router-grid { grid-template-columns: repeat(2, 1fr); }
    .roadmap-grid { grid-template-columns: repeat(2, 1fr); }
    .founder-card { flex-direction: column; align-items: center; text-align: center; }
    .founder-text blockquote { border-left: none; padding-left: 0; }
}

@media (max-width: 640px) {
    .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0; background: rgba(255,255,255,.96); flex-direction: column; padding: 20px; gap: 4px; border-bottom: 1px solid var(--gray-200); backdrop-filter: blur(20px); }
    .nav-links.active { display: flex; }
    .nav-toggle { display: flex; }
    .pains-grid, .skills-grid, .skills-plus-grid, .router-grid, .service-grid, .roadmap-grid { grid-template-columns: 1fr; }
    section { padding: 64px 0; }
    .hero { padding: 120px 0 64px; }
    .cta-card { padding: 48px 24px; }
    .cta-contact { flex-direction: column; align-items: center; gap: 12px; }
}