:root {
    --bg: #fafbfc;
    --bg-alt: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --accent: #0077ff;
    --accent2: #00d4ff;
    --accent3: #00f5d4;
    --gradient: linear-gradient(135deg, #00d4ff, #0077ff 50%, #00f5d4);
    --radius: 14px;
    --shadow: 0 4px 24px rgba(15, 23, 42, 0.08);
    --nav-h: 72px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--bg); color: var(--text); line-height: 1.7; }
a { color: inherit; text-decoration: none; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

.nav { position: fixed; inset: 0 0 auto; height: var(--nav-h); z-index: 100; background: rgba(255,255,255,.85); backdrop-filter: blur(16px); border-bottom: 1px solid rgba(0,119,255,.08); }
.nav-inner { max-width: 1140px; margin: 0 auto; padding: 0 24px; height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { font-size: 1.25rem; font-weight: 700; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-menu { display: flex; gap: 8px; }
.nav-menu a { padding: 8px 14px; border-radius: 8px; font-size: .9rem; font-weight: 500; color: var(--muted); transition: .2s; }
.nav-menu a:hover, .nav-menu a.active { color: var(--accent); background: rgba(0,119,255,.08); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

.hero { min-height: 100vh; display: flex; align-items: center; justify-content: center; position: relative; padding: calc(var(--nav-h) + 40px) 24px 80px; overflow: hidden; }
.hero-grid { position: absolute; inset: 0; background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0,212,255,.12), transparent), linear-gradient(180deg, #fff 0%, var(--bg) 100%); }
.hero-inner { position: relative; text-align: center; max-width: 720px; }
.hero-tag { font-size: .95rem; color: var(--muted); margin-bottom: 16px; letter-spacing: .05em; }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.2; margin-bottom: 20px; }
.gradient-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-type { font-size: 1.2rem; color: var(--muted); min-height: 1.8em; margin-bottom: 32px; }
.cursor { animation: blink 1s step-end infinite; color: var(--accent); }
@keyframes blink { 50% { opacity: 0; } }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 12px 28px; border-radius: 10px; font-weight: 600; font-size: .95rem; border: none; cursor: pointer; transition: .25s; }
.btn-primary { background: var(--gradient); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,119,255,.35); }
.btn-outline { background: transparent; border: 2px solid rgba(0,119,255,.25); color: var(--text); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.scroll-hint { position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%); text-align: center; font-size: .75rem; color: var(--muted); }
.mouse { width: 22px; height: 34px; border: 2px solid var(--muted); border-radius: 12px; margin: 8px auto 0; position: relative; }
.mouse::after { content: ''; width: 4px; height: 8px; background: var(--accent); border-radius: 2px; position: absolute; top: 6px; left: 50%; transform: translateX(-50%); animation: scroll 2s infinite; }
@keyframes scroll { 0%,100%{opacity:1;top:6px} 50%{opacity:.3;top:14px} }

.section { padding: 100px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head .label { display: inline-block; font-size: .8rem; font-weight: 600; color: var(--accent); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 12px; }
.section-head h2 { font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 700; }
.section-head p { color: var(--muted); margin-top: 10px; }

.about-layout { display: grid; grid-template-columns: auto 1fr; gap: 48px; align-items: start; }
.about-avatar { width: 200px; height: 200px; border-radius: var(--radius); background: var(--gradient); display: flex; align-items: center; justify-content: center; font-size: 4rem; font-weight: 800; color: #fff; box-shadow: var(--shadow); }
.about-body h3 { font-size: 1.5rem; margin-bottom: 16px; }
.about-body p { color: var(--muted); margin-bottom: 12px; }
.about-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0; }
.tag-item { display: flex; align-items: center; gap: 8px; padding: 10px 16px; background: var(--bg); border-radius: 10px; font-size: .9rem; border: 1px solid rgba(0,0,0,.06); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 28px; }
.stat { text-align: center; padding: 20px; background: var(--bg); border-radius: var(--radius); }
.stat strong { display: block; font-size: 1.6rem; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat span { font-size: .8rem; color: var(--muted); }

.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.card { background: #fff; border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); border: 1px solid rgba(0,0,0,.04); transition: .3s; }
.card:hover { transform: translateY(-4px); }
.card-icon { font-size: 2rem; margin-bottom: 12px; }
.card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.card p { font-size: .9rem; color: var(--muted); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.tags span { font-size: .75rem; padding: 4px 10px; background: rgba(0,119,255,.08); color: var(--accent); border-radius: 20px; font-weight: 500; }
.progress { height: 6px; background: rgba(0,0,0,.06); border-radius: 3px; margin-top: 16px; overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: var(--gradient); border-radius: 3px; transition: width 1s ease; }

.work-card { padding: 0; overflow: hidden; }
.work-cover { height: 160px; background: linear-gradient(135deg, #e8f4ff, #f0fdf9); display: flex; align-items: center; justify-content: center; font-size: 3.5rem; position: relative; }
.work-links { position: absolute; inset: 0; background: rgba(15,23,42,.7); display: flex; align-items: center; justify-content: center; gap: 12px; opacity: 0; transition: .3s; }
.work-card:hover .work-links { opacity: 1; }
.work-links a { padding: 8px 18px; background: #fff; border-radius: 8px; font-size: .85rem; font-weight: 600; color: var(--accent); }
.work-body { padding: 20px; }
.work-cat { font-size: .75rem; color: var(--accent); font-weight: 600; }
.work-body h3 { margin: 6px 0 8px; }

.contact-layout { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: start; }
.contact-info h3 { font-size: 1.3rem; margin-bottom: 12px; }
.contact-info p { color: var(--muted); margin-bottom: 20px; }
.contact-info ul { list-style: none; }
.contact-info li { padding: 10px 0; color: var(--muted); }
.contact-form { background: #fff; padding: 32px; border-radius: var(--radius); box-shadow: var(--shadow); }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; }
.field input, .field textarea { width: 100%; padding: 12px 14px; border: 1px solid rgba(0,0,0,.1); border-radius: 8px; font: inherit; transition: .2s; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent2); box-shadow: 0 0 0 3px rgba(0,212,255,.15); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.footer { padding: 48px 0; background: var(--text); color: #94a3b8; }
.footer-inner { text-align: center; }
.footer-brand { font-size: 1.3rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-social { display: flex; justify-content: center; gap: 16px; margin-bottom: 16px; font-size: 1.3rem; }
.footer-social a:hover { opacity: .8; }
.copyright { font-size: .85rem; }
.filing { margin-top: 10px; font-size: .8rem; }
.filing a { color: #94a3b8; margin: 0 8px; }

.reveal { opacity: 0; transform: translateY(24px); transition: .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
    .about-layout, .contact-layout { grid-template-columns: 1fr; }
    .about-avatar { margin: 0 auto; }
    .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .nav-menu { display: none; position: fixed; top: var(--nav-h); left: 0; right: 0; background: #fff; flex-direction: column; padding: 16px; box-shadow: var(--shadow); }
    .nav-menu.open { display: flex; }
    .nav-toggle { display: flex; }
    .form-row { grid-template-columns: 1fr; }
}

/* ========== 漂流玫瑰花瓣 ========== */
.petals-layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 50;
    overflow: hidden;
}
.petal {
    position: absolute;
    top: -40px;
    will-change: transform, opacity;
    animation: petal-fall 12s linear infinite;
    /* 只在 transform/opacity 上做动画 —— GPU 合成层属性，不触发 reflow */
}
.petal-inner {
    animation: petal-drift 8s ease-in-out infinite;
    /* 内层单独负责摇摆旋转 —— 和外层 translateY 互不干扰 */
}
.petal svg { display: block; }

@keyframes petal-fall {
    0%   { transform: translateY(0); opacity: 0; }
    8%   { opacity: 0.9; }
    92%  { opacity: 0.75; }
    100% { transform: translateY(calc(100vh + 80px)); opacity: 0; }
}

@keyframes petal-drift {
    0%   { transform: translateX(0) rotate(0deg); }
    20%  { transform: translateX(30px) rotate(72deg); }
    40%  { transform: translateX(-20px) rotate(144deg); }
    60%  { transform: translateX(25px) rotate(216deg); }
    80%  { transform: translateX(-15px) rotate(288deg); }
    100% { transform: translateX(0) rotate(360deg); }
}

/* ========== 系统减少动态效果开关 — 无障碍硬要求 ========== */
@media (prefers-reduced-motion: reduce) {
    .petals-layer { display: none; }
}