/* ============================================
   全局重置 & CSS 变量
============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #050810;
  --bg2:       #0b0f1e;
  --surface:   #111527;
  --surface2:  #1a2035;
  --accent:    #00d4ff;
  --accent2:   #7b5ea7;
  --accent3:   #00ff9d;
  --text:      #e2e8f0;
  --muted:     #64748b;
  --border:    rgba(0,212,255,0.12);
  --radius:    14px;
  --font-mono: 'JetBrains Mono', monospace;
  --font-main: 'Noto Sans SC', sans-serif;
  --ease-out:  cubic-bezier(0.16,1,0.3,1);
  --nav-h:     64px;
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.7;
}
a  { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* 粒子 Canvas */
#bg-canvas {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none; opacity: 0.5;
}

/* 网格线背景 */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0,212,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 90% at 50% 50%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 90% at 50% 50%, black 30%, transparent 100%);
}

/* 角落光晕 */
body::after {
  content: '';
  position: fixed;
  top: -180px; right: -180px;
  width: 560px; height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(123,94,167,0.14) 0%, transparent 65%);
  z-index: 0; pointer-events: none;
  animation: driftGlow 12s ease-in-out infinite alternate;
}
@keyframes driftGlow {
  from { transform: translate(0,0) scale(1);        opacity: 0.8; }
  to   { transform: translate(-40px,40px) scale(1.15); opacity: 1; }
}

/* ============================================
   导航栏
============================================ */
#navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 6vw; z-index: 999;
  backdrop-filter: blur(18px);
  background: rgba(5,8,16,0.72);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}
.nav-logo {
  font-family: var(--font-mono); font-size: 1.3rem;
  font-weight: 600; letter-spacing: 0.1em; color: var(--accent);
}
.nav-logo .dot { color: var(--accent3); }
.nav-links { display: flex; gap: 2.5rem; }
.nav-links a {
  font-size: 0.88rem; letter-spacing: 0.08em;
  color: var(--muted); position: relative; transition: color 0.25s;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 1.5px; background: var(--accent);
  transition: width 0.3s var(--ease-out);
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text); border-radius: 2px; transition: 0.3s;
}

/* ============================================
   Section 通用
============================================ */
section { position: relative; z-index: 1; padding: 110px 6vw; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section-title {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem,3vw,2rem);
  margin-bottom: 56px; letter-spacing: 0.04em;
}
.section-title .accent { color: var(--accent); margin-right: 0.5em; }

/* Reveal 进入动画 */
.reveal {
  opacity: 0; transform: translateY(32px);
  transition: opacity 0.75s var(--ease-out), transform 0.75s var(--ease-out);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============================================
   Hero
============================================ */
#hero {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  padding-top: calc(var(--nav-h) + 40px);
  padding-left: 8vw; padding-right: 8vw;
  background:
    radial-gradient(ellipse 60% 55% at 68% 38%, rgba(0,212,255,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 45% 40% at 18% 72%, rgba(123,94,167,0.09) 0%, transparent 70%);
}
.hero-content { max-width: 720px; }

/* 圆形头像 */
.hero-avatar { margin-bottom: 32px; transition-delay: 0s; }
.avatar-ring {
  display: inline-flex; align-items: center; justify-content: center;
  width: 116px; height: 116px;
  border-radius: 50%; padding: 3px;
  background: conic-gradient(
    var(--accent) 0deg, var(--accent2) 120deg,
    var(--accent3) 240deg, var(--accent) 360deg
  );
  animation: spinRing 5s linear infinite;
  box-shadow: 0 0 28px rgba(0,212,255,0.35), 0 0 60px rgba(0,212,255,0.12);
}
@keyframes spinRing {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.avatar-inner {
  width: 100%; height: 100%; border-radius: 50%;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 1.55rem;
  font-weight: 600; color: var(--accent); letter-spacing: 0.06em;
  animation: spinRing 5s linear infinite reverse;
  user-select: none;
}

.hero-greeting {
  font-family: var(--font-mono); color: var(--accent);
  font-size: 1rem; letter-spacing: 0.15em;
  margin-bottom: 14px; transition-delay: 0.1s;
}
.hero-name {
  font-size: clamp(3rem,8vw,5.5rem);
  font-weight: 700; line-height: 1.1;
  letter-spacing: -0.02em; margin-bottom: 18px;
  background: linear-gradient(135deg, #fff 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition-delay: 0.2s;
}
.cursor-blink {
  -webkit-text-fill-color: var(--accent);
  animation: blink 1s step-end infinite;
}
@keyframes blink {
  0%,100% { opacity: 1; }
  50%     { opacity: 0; }
}
.hero-tagline {
  font-size: clamp(1rem,2.5vw,1.2rem);
  color: var(--muted); margin-bottom: 40px;
  letter-spacing: 0.06em; transition-delay: 0.3s;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; transition-delay: 0.4s; }
.btn {
  display: inline-block; padding: 13px 32px;
  border-radius: 50px; font-size: 0.9rem;
  font-weight: 600; letter-spacing: 0.06em; cursor: pointer;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #05080f; box-shadow: 0 0 24px rgba(0,212,255,0.28);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(0,212,255,0.5); }
.btn-outline { border: 1.5px solid var(--accent); color: var(--accent); }
.btn-outline:hover {
  transform: translateY(-3px);
  background: rgba(0,212,255,0.08);
  box-shadow: 0 8px 24px rgba(0,212,255,0.18);
}
.scroll-hint {
  margin-top: 72px; display: flex; flex-direction: column;
  align-items: flex-start; gap: 8px; transition-delay: 0.6s;
}
.scroll-hint span {
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--muted); letter-spacing: 0.15em;
}
.scroll-arrow {
  width: 1.5px; height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollDown 1.6s ease-in-out infinite;
}
@keyframes scrollDown {
  0%   { transform: scaleY(0); transform-origin: top;    opacity: 1; }
  50%  { transform: scaleY(1); transform-origin: top;    opacity: 1; }
  100% { transform: scaleY(1); transform-origin: bottom; opacity: 0; }
}

/* ============================================
   ������
============================================ */
#about { background: linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px; align-items: start;
}
.about-text p { color: var(--muted); margin-bottom: 16px; font-size: 1.02rem; }
.about-text strong { color: var(--text); }
.about-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.tag {
  padding: 6px 16px; border-radius: 50px;
  background: var(--surface); border: 1px solid var(--border);
  font-size: 0.82rem; color: var(--muted);
  transition: border-color 0.25s, color 0.25s, transform 0.25s;
}
.tag:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.about-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px 32px;
  display: flex; flex-direction: column; gap: 18px;
}
.info-item {
  display: flex; justify-content: space-between;
  font-size: 0.9rem; padding-bottom: 14px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.info-item:last-child { border-bottom: none; padding-bottom: 0; }
.info-label { font-family: var(--font-mono); color: var(--muted); font-size: 0.8rem; }
.status-dot::before {
  content: ''; display: inline-block;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent3); margin-right: 7px;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { opacity:1; box-shadow:0 0 0 0 rgba(0,255,157,0.4); }
  50%     { opacity:0.7; box-shadow:0 0 0 6px rgba(0,255,157,0); }
}

/* ============================================
   ����
============================================ */
#skills { background: var(--bg2); }
.skills-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 32px; }
.skill-category {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: border-color 0.3s, transform 0.3s;
}
.skill-category:hover { border-color: rgba(0,212,255,0.35); transform: translateY(-4px); }
.skill-category h3 {
  font-family: var(--font-mono); font-size: 0.85rem;
  color: var(--accent); letter-spacing: 0.1em;
  margin-bottom: 24px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.skill-bar-wrap { margin-bottom: 16px; }
.skill-bar-wrap span { display: block; font-size: 0.82rem; color: var(--muted); margin-bottom: 6px; }
.skill-bar {
  height: 5px; background: var(--surface2);
  border-radius: 99px; overflow: hidden; position: relative;
}
.skill-bar::after {
  content: ''; position: absolute; inset: 0; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 99px; transition: width 1.1s var(--ease-out);
}
.skill-bar.animated::after { width: var(--target-w); }

/* ============================================
   ��Ŀչʾ
============================================ */
#projects { background: linear-gradient(180deg, var(--bg2) 0%, var(--bg) 100%); }
.projects-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.project-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  display: flex; flex-direction: column; gap: 12px;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
  cursor: default; position: relative; overflow: hidden;
}
.project-card::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(0,212,255,0.04) 0%, transparent 60%);
  opacity: 0; transition: opacity 0.3s; pointer-events: none;
}
.project-card:hover {
  border-color: rgba(0,212,255,0.45); transform: translateY(-7px);
  box-shadow: 0 20px 56px rgba(0,0,0,0.45);
}
.project-card:hover::before { opacity: 1; }
.project-header { display: flex; justify-content: space-between; align-items: center; }
.project-icon { font-size: 1.6rem; }
.project-link {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; border: 1px solid var(--border);
  font-size: 1rem; color: var(--muted);
  transition: border-color 0.25s, color 0.25s, transform 0.25s;
}
.project-link:hover { border-color: var(--accent); color: var(--accent); transform: rotate(-45deg); }
.project-card h3 { font-size: 1.02rem; font-weight: 600; color: var(--text); }
.project-card p  { font-size: 0.87rem; color: var(--muted); line-height: 1.75; flex: 1; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.project-tags span {
  font-family: var(--font-mono); font-size: 0.72rem;
  padding: 3px 10px; border-radius: 4px;
  background: rgba(0,212,255,0.07); color: var(--accent);
  border: 1px solid rgba(0,212,255,0.15);
}

/* ============================================
   ��ϵ��ʽ
============================================ */
#contact { background: var(--bg); text-align: center; }
#contact .section-title { margin-bottom: 16px; }
.contact-sub { color: var(--muted); margin-bottom: 48px; font-size: 1rem; }
.contact-cards { display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; }
.contact-card {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 32px 40px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  min-width: 180px;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}
.contact-card:hover {
  border-color: rgba(0,212,255,0.4); transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0,212,255,0.1);
}
.contact-icon  { font-size: 1.6rem; margin-bottom: 4px; }
.contact-label { font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent); letter-spacing: 0.12em; }
.contact-value { font-size: 0.88rem; color: var(--muted); }

/* ============================================
   ҳ�� & ����
============================================ */
footer {
  position: relative; z-index: 1;
  text-align: center; padding: 28px;
  font-size: 0.82rem; color: var(--muted);
  border-top: 1px solid rgba(255,255,255,0.04);
}
footer .accent { color: var(--accent); }
#cursor-glow {
  position: fixed; width: 340px; height: 340px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,212,255,0.07) 0%, transparent 70%);
  pointer-events: none; z-index: 0;
  transform: translate(-50%,-50%);
  transition: left 0.1s ease, top 0.1s ease;
}

/* ============================================
   ��Ӧʽ
============================================ */
@media (max-width: 1024px) { .projects-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 900px) {
  .about-grid  { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-links  { display: none; }
  .nav-toggle { display: flex; }
  #hero { padding-left: 6vw; padding-right: 6vw; }
  .projects-grid { grid-template-columns: 1fr; }
  .contact-cards { flex-direction: column; align-items: center; }
}