:root {
    --bg-dark: #0b1220;
    --bg-darker: #050914;
    --bg-card: rgba(148, 163, 184, 0.09);
    --bg-card-strong: rgba(148, 163, 184, 0.15);
    --border: rgba(255, 255, 255, 0.16);
    --text-primary: #eef6ff;
    --text-secondary: #9fb3c8;
    --accent: #38bdf8;
    --accent-secondary: #2dd4bf;
    --accent-warm: #f59e0b;
    --danger: #ff6b6b;
    --success: #34d399;
    --glow: rgba(56, 189, 248, 0.25);
    --shadow: 0 28px 70px rgba(2, 8, 23, 0.45);
    --radius-lg: 30px;
    --radius-md: 20px;
    --radius-sm: 14px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    background:
        radial-gradient(circle at 16% 8%, rgba(56, 189, 248, 0.24), transparent 28%),
        radial-gradient(circle at 80% 12%, rgba(45, 212, 191, 0.16), transparent 25%),
        radial-gradient(circle at 58% 84%, rgba(99, 102, 241, 0.16), transparent 32%),
        linear-gradient(135deg, #050914 0%, #0b1220 48%, #101827 100%);
    color: var(--text-primary);
    font-family: "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
    font-size: 15px;
    line-height: 1.66;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
    background-size: 68px 68px;
    mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.72), transparent 78%);
}

a {
    color: inherit;
}

.container {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
}

.main-content {
    flex: 1;
    padding-top: 76px;
}

.global-header {
    position: fixed;
    top: 14px;
    left: 0;
    right: 0;
    z-index: 100;
    pointer-events: none;
}

.header-container {
    width: min(1120px, calc(100% - 28px));
    height: 68px;
    margin: 0 auto;
    padding: 0 12px 0 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(5, 9, 20, 0.72);
    box-shadow: var(--shadow);
    backdrop-filter: blur(22px);
    pointer-events: auto;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.brand-mark {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: #04111f;
    font-size: 1.2rem;
    font-weight: 900;
    box-shadow: 0 0 28px var(--glow);
}

.brand-copy {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
    gap: 8px;
}

.brand-copy strong {
    font-size: 0.98rem;
    letter-spacing: 0.16em;
}

.brand-copy small {
    color: var(--text-secondary);
    font-size: 0.68rem;
}

.main-nav ul {
    display: flex;
    align-items: center;
    gap: 6px;
    list-style: none;
}

.main-nav a {
    display: inline-flex;
    align-items: center;
    min-height: 42px;
    padding: 0 18px;
    border-radius: 999px;
    color: var(--text-secondary);
    font-size: 0.92rem;
    font-weight: 700;
    text-decoration: none;
    transition: color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}

.main-nav a:hover,
.main-nav a.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    width: 46px;
    height: 46px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 4px auto;
    background: var(--text-primary);
    border-radius: 999px;
}

.global-footer {
    margin-top: auto;
    padding: 42px 0 30px;
    border-top: 1px solid var(--border);
    background: rgba(5, 9, 20, 0.82);
}

.footer-container {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 28px;
    align-items: center;
}

.footer-title {
    font-size: 1.05rem;
    font-weight: 800;
}

.footer-subtitle,
.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.86rem;
}

.footer-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.footer-links a,
.footer-copyright a {
    color: var(--text-secondary);
    text-decoration: none;
}

.footer-links a {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: 999px;
    transition: all 0.25s ease;
}

.footer-links a:hover,
.footer-copyright a:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.section {
    padding: 64px 0;
}

.section-soft {
    background: rgba(255, 255, 255, 0.04);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-header {
    max-width: 760px;
    margin: 0 auto 30px;
    text-align: center;
}

.section-header.left {
    margin-left: 0;
    text-align: left;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    color: var(--accent);
    font-size: 0.72rem;
    font-weight: 900;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.eyebrow::before {
    content: "";
    width: 26px;
    height: 1px;
    background: currentColor;
}

.section-title {
    margin-bottom: 10px;
    color: var(--text-primary);
    font-size: clamp(1.45rem, 2.5vw, 2.15rem);
    font-weight: 800;
    line-height: 1.18;
    letter-spacing: -0.025em;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 0.94rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 0 19px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    font-size: 0.88rem;
    font-weight: 700;
    text-decoration: none;
    transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.btn:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.14);
}

.btn-primary {
    border-color: transparent;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: #04111f;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #7dd3fc, #5eead4);
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.glass-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.05));
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
}

.tag,
.skill-tag,
.cloud-tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 11px;
    border: 1px solid rgba(56, 189, 248, 0.26);
    border-radius: 999px;
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 800;
}

.reveal,
.fade-in-scroll {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.75s ease, transform 0.75s ease;
}

.reveal.visible,
.fade-in-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.cursor-glow {
    position: fixed;
    width: 360px;
    height: 360px;
    left: 0;
    top: 0;
    z-index: -1;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.14), transparent 62%);
    pointer-events: none;
    transform: translate(-50%, -50%);
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }

    .cursor-glow {
        display: none;
    }
}

@media (max-width: 820px) {
    .main-content {
        padding-top: 82px;
    }

    .brand-copy small {
        display: none;
    }

    .nav-toggle {
        display: block;
    }

    .main-nav {
        position: absolute;
        top: 78px;
        right: 14px;
        width: min(280px, calc(100vw - 28px));
        padding: 12px;
        border: 1px solid var(--border);
        border-radius: 24px;
        background: rgba(5, 9, 20, 0.94);
        box-shadow: var(--shadow);
        opacity: 0;
        transform: translateY(-12px);
        pointer-events: none;
        transition: all 0.25s ease;
    }

    .main-nav.open {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
    }

    .main-nav ul {
        flex-direction: column;
        align-items: stretch;
    }

    .main-nav a {
        width: 100%;
        justify-content: center;
    }

    .section {
        padding: 48px 0;
    }

    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 560px) {
    .container,
    .footer-container {
        width: min(100% - 28px, 1180px);
    }

    .header-container {
        height: 62px;
    }

    .cursor-glow {
        display: none;
    }

    .brand-mark {
        width: 38px;
        height: 38px;
    }

    .button-row,
    .button-row .btn {
        width: 100%;
    }
}