/* ===========================================================
   徐葳 · 个人简介 — 科技感主题
   纯原生 CSS，无任何第三方库依赖
   =========================================================== */

:root {
    --bg: #050a14;
    --bg-soft: #0a1120;
    --panel: rgba(13, 22, 40, 0.72);
    --panel-line: rgba(0, 229, 255, 0.18);
    --cyan: #00e5ff;
    --blue: #2979ff;
    --green: #00ff9d;
    --text: #d6e2f0;
    --muted: #7c8ba3;
    --glow: 0 0 18px rgba(0, 229, 255, 0.35);
    --mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, "Courier New", monospace;
    --sans: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(0, 229, 255, 0.3); color: #fff; }

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

/* ---------- 粒子背景 ---------- */
#bg-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background:
        radial-gradient(ellipse at 20% 10%, rgba(41, 121, 255, 0.18), transparent 55%),
        radial-gradient(ellipse at 85% 90%, rgba(0, 255, 157, 0.10), transparent 50%),
        var(--bg);
}

/* ---------- 顶部导航 ---------- */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px clamp(18px, 5vw, 64px);
    transition: background .35s, backdrop-filter .35s, border-color .35s;
    border-bottom: 1px solid transparent;
}
.navbar.scrolled {
    background: rgba(5, 10, 20, 0.82);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--panel-line);
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand-mark {
    width: 36px; height: 36px;
    display: grid; place-items: center;
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    color: #04111f;
    font-family: var(--mono);
    font-weight: 800;
    border-radius: 8px;
    box-shadow: var(--glow);
}
.brand-text { font-size: 16px; letter-spacing: .5px; }
.brand-text small { display: block; font-size: 10px; color: var(--muted); letter-spacing: 2px; font-family: var(--mono); }

.nav-links { display: flex; gap: 26px; list-style: none; align-items: center; }
.nav-links a {
    font-size: 14px; color: var(--muted);
    position: relative; padding: 6px 0;
    transition: color .25s;
}
.nav-links a::after {
    content: ""; position: absolute; left: 0; bottom: 0;
    width: 0; height: 2px; background: var(--cyan);
    box-shadow: var(--glow); transition: width .25s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-cta {
    border: 1px solid var(--panel-line);
    padding: 6px 16px !important; border-radius: 20px;
    color: var(--cyan) !important;
}
.nav-cta::after { display: none; }
.nav-cta:hover { background: rgba(0, 229, 255, 0.12); box-shadow: var(--glow); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); transition: .3s; }

/* ---------- Hero ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 20px 80px;
    overflow: hidden;
}
.hero-grid {
    position: absolute; inset: 0; z-index: -1;
    background-image:
        linear-gradient(rgba(0, 229, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.06) 1px, transparent 1px);
    background-size: 46px 46px;
    mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}
.hero-inner { max-width: 880px; }
.hero-kicker {
    font-family: var(--mono); color: var(--cyan);
    font-size: clamp(11px, 1.4vw, 14px); letter-spacing: 2px;
    margin-bottom: 18px; opacity: .9;
}
.hero-title { font-size: clamp(56px, 13vw, 150px); line-height: 1; font-weight: 800; letter-spacing: 4px; }
.hero-sub {
    margin-top: 18px; font-size: clamp(18px, 3.2vw, 30px);
    font-weight: 600; color: #eaf2fb;
}
.hero-type {
    margin-top: 14px; font-family: var(--mono);
    color: var(--muted); font-size: clamp(13px, 2vw, 17px);
    min-height: 1.7em;
}
.caret { color: var(--cyan); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-actions { margin-top: 34px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
    padding: 13px 30px; border-radius: 30px; font-size: 15px; font-weight: 600;
    transition: transform .2s, box-shadow .2s, background .2s; cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, var(--cyan), var(--blue)); color: #04111f; box-shadow: var(--glow); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 0 28px rgba(0, 229, 255, 0.6); }
.btn-ghost { border: 1px solid var(--panel-line); color: var(--text); }
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); box-shadow: var(--glow); }

.hero-stats {
    margin-top: 56px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
    max-width: 720px; margin-left: auto; margin-right: auto;
}
.stat { padding: 18px 8px; border: 1px solid var(--panel-line); border-radius: 12px; background: var(--panel); }
.stat b { display: block; font-family: var(--mono); font-size: clamp(26px, 4vw, 38px); color: var(--cyan); text-shadow: var(--glow); }
.stat span { font-size: 12px; color: var(--muted); }

.scroll-hint { position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%); width: 26px; height: 42px; border: 2px solid var(--panel-line); border-radius: 14px; }
.scroll-hint span { position: absolute; top: 8px; left: 50%; transform: translateX(-50%); width: 4px; height: 8px; background: var(--cyan); border-radius: 2px; animation: scrolld 1.6s infinite; }
@keyframes scrolld { 0% { top: 8px; opacity: 1; } 70% { top: 24px; opacity: 0; } 100% { opacity: 0; } }

/* 标题：蓝色渐变流光文字 */
.glitch {
    position: relative;
    background: linear-gradient(110deg, #00e5ff 0%, #2979ff 25%, #bcd8ff 50%, #2979ff 75%, #00e5ff 100%);
    background-size: 220% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    animation: textflow 4.5s linear infinite;
    filter: drop-shadow(0 0 16px rgba(41, 121, 255, 0.45));
}
@keyframes textflow { to { background-position: 220% center; } }
.glitch::before, .glitch::after { display: none; }

/* ---------- 通用 section ---------- */
.section { max-width: 1120px; margin: 0 auto; padding: 92px clamp(18px, 5vw, 40px); }
.section-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 44px; }
.section-index { font-family: var(--mono); font-size: 14px; color: var(--cyan); border: 1px solid var(--panel-line); padding: 4px 10px; border-radius: 6px; }
.section-title { font-size: clamp(24px, 4vw, 38px); font-weight: 700; letter-spacing: 1px; }
.section-title em { font-style: normal; font-family: var(--mono); font-size: 14px; color: var(--muted); letter-spacing: 2px; margin-left: 6px; }

/* ---------- 简介 ---------- */
.about-grid { display: grid; grid-template-columns: 280px 1fr; gap: 48px; align-items: center; }
.about-portrait { position: relative; width: 240px; height: 240px; margin: 0 auto; display: grid; place-items: center; }
.portrait-ring { position: absolute; inset: 0; border: 1px solid var(--panel-line); border-radius: 50%; box-shadow: var(--glow); animation: spin 18s linear infinite; }
.portrait-ring::before { content: ""; position: absolute; inset: 16px; border: 1px dashed rgba(0, 229, 255, 0.35); border-radius: 50%; }
@keyframes spin { to { transform: rotate(360deg); } }
.portrait-avatar {
    width: 150px; height: 150px; border-radius: 50%;
    object-fit: cover; object-position: top center;
    box-shadow: 0 0 30px rgba(0, 229, 255, 0.5);
}
.portrait-tag { position: absolute; bottom: -6px; font-family: var(--mono); font-size: 12px; letter-spacing: 3px; color: var(--cyan); background: var(--bg); padding: 2px 12px; border: 1px solid var(--panel-line); border-radius: 20px; }

.profile-list { list-style: none; }
.profile-list li { position: relative; padding: 9px 0 9px 24px; border-bottom: 1px dashed rgba(124, 139, 163, 0.18); }
.profile-list li b { color: var(--cyan); }
.dot { position: absolute; left: 4px; top: 18px; width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); }
.about-desc { margin-top: 20px; color: var(--muted); }
.about-desc b { color: var(--text); }

/* ---------- 技术栈 ---------- */
.skills-wrap { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr)); gap: 20px; }
.skill-group { padding: 22px; border: 1px solid var(--panel-line); border-radius: 14px; background: var(--panel); transition: transform .25s, border-color .25s, box-shadow .25s; }
.skill-group:hover { transform: translateY(-4px); border-color: var(--cyan); box-shadow: var(--glow); }
.skill-title { font-size: 16px; margin-bottom: 16px; display: flex; align-items: center; gap: 10px; color: #eaf2fb; }
.skill-title .ico { color: var(--cyan); font-size: 18px; }
.tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
    font-family: var(--mono); font-size: 13px;
    padding: 6px 14px; border-radius: 20px;
    border: 1px solid var(--panel-line); color: var(--text);
    background: rgba(0, 229, 255, 0.04);
    transition: .2s;
}
.tag:hover { background: rgba(0, 229, 255, 0.15); color: var(--cyan); border-color: var(--cyan); transform: translateY(-2px); }

/* ---------- 项目 ---------- */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr)); gap: 20px; }
.project-card { position: relative; padding: 26px 24px; border: 1px solid var(--panel-line); border-radius: 14px; background: var(--panel); overflow: hidden; transition: transform .25s, border-color .25s, box-shadow .25s; }
.project-card::before { content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 2px; background: linear-gradient(90deg, var(--cyan), transparent); transform: scaleX(0); transform-origin: left; transition: transform .35s; }
.project-card:hover { transform: translateY(-5px); border-color: var(--cyan); box-shadow: var(--glow); }
.project-card:hover::before { transform: scaleX(1); }
.project-no { font-family: var(--mono); font-size: 13px; color: var(--cyan); letter-spacing: 2px; }
.project-card h3 { margin: 10px 0 10px; font-size: 18px; color: #eaf2fb; }
.project-card p { color: var(--muted); font-size: 14px; }

/* ---------- 培训客户 ---------- */
.training-note { color: var(--muted); margin-bottom: 26px; }
.clients-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.client {
    font-size: 14px; text-align: center; padding: 14px 10px;
    border: 1px solid var(--panel-line); border-radius: 10px;
    background: var(--panel); color: var(--text);
    transition: .22s;
}
.client:hover { color: var(--cyan); border-color: var(--cyan); box-shadow: var(--glow); transform: translateY(-3px); }

/* ---------- 著作 ---------- */
.books-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(440px, 100%), 1fr)); gap: 24px; }
.book-card { display: flex; gap: 20px; padding: 22px; border: 1px solid var(--panel-line); border-radius: 14px; background: var(--panel); transition: .25s; }
.book-card:hover { transform: translateY(-4px); border-color: var(--cyan); box-shadow: var(--glow); }
.book-cover {
    flex: 0 0 110px; height: 150px;
    border-radius: 8px;
    object-fit: contain;
    background: #f0f4f8;
    box-shadow: var(--glow);
}
.book-meta { min-width: 0; }
.book-meta h3 { font-size: 17px; margin-bottom: 8px; color: #eaf2fb; white-space: nowrap; }
.book-meta p { font-size: 14px; color: var(--muted); }

/* ---------- 联系 ---------- */
.contact-box { text-align: center; padding: 50px 24px; border: 1px solid var(--panel-line); border-radius: 18px; background: var(--panel); position: relative; overflow: hidden; }
.contact-box::after { content: ""; position: absolute; inset: -2px; background: radial-gradient(circle at 50% 0%, rgba(0,229,255,.18), transparent 60%); pointer-events: none; }
.contact-lead { color: var(--muted); margin-bottom: 22px; }
.contact-mail { display: inline-block; font-family: var(--mono); font-size: clamp(18px, 3.5vw, 28px); color: var(--cyan); padding: 14px 28px; border: 1px solid var(--panel-line); border-radius: 40px; box-shadow: var(--glow); transition: .25s; }
.contact-mail:hover { background: rgba(0,229,255,.1); transform: translateY(-3px); }
.mail-ico { margin-right: 8px; }
.contact-links { margin-top: 24px; display: flex; gap: 22px; justify-content: center; flex-wrap: wrap; }
.contact-links a { color: var(--muted); font-size: 14px; transition: color .2s; }
.contact-links a:hover { color: var(--cyan); }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--panel-line); padding: 34px clamp(18px, 5vw, 40px); text-align: center; }
.footer-inner { display: flex; flex-direction: column; gap: 6px; }
.footer-brand { font-weight: 600; }
.footer-meta { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.footer-beian { margin-top: 14px; font-size: 12px; color: var(--muted); display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.footer-beian a:hover { color: var(--cyan); }

/* ---------- 滚动入场 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.show { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
    .about-grid { grid-template-columns: 1fr; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .nav-links {
        position: fixed; top: 68px; right: 0; width: 220px;
        flex-direction: column; gap: 0; padding: 10px 0;
        background: rgba(5, 10, 20, 0.96); backdrop-filter: blur(12px);
        border: 1px solid var(--panel-line); border-radius: 0 0 0 14px;
        transform: translateX(110%); transition: transform .3s;
    }
    .nav-links.open { transform: translateX(0); }
    .nav-links li { width: 100%; }
    .nav-links a { display: block; padding: 12px 24px !important; }
    .nav-links a::after { display: none; }
    .nav-toggle { display: flex; }
}
@media (max-width: 520px) {
    .section { padding: 72px clamp(16px, 5vw, 24px); }
    .hero { padding: 110px 16px 70px; }
    .hero-stats { gap: 12px; margin-top: 44px; }
    .stat { padding: 14px 6px; }
    .stat span { font-size: 11px; }
    .section-head { flex-wrap: wrap; gap: 10px; margin-bottom: 32px; }
    .book-card { flex-direction: column; align-items: center; text-align: center; }
    .book-meta h3 { white-space: normal; }
    .contact-mail { font-size: clamp(15px, 4.6vw, 22px); padding: 12px 20px; word-break: break-all; }
}
@media (max-width: 360px) {
    .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    .hero-actions .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
    .reveal { opacity: 1; transform: none; }
}