/* ============================================================
   lji 个人主页 —— 炫酷动效风
   色板:深空背景 + 青蓝/紫/品红霓虹
   ============================================================ */

:root {
  --bg: #05060a;
  --bg-soft: #0b0e16;
  --fg: #e6edf6;
  --muted: #8b95a7;
  --cyan: #00f0ff;
  --purple: #a855f7;
  --pink: #ec4899;
  --border: rgba(255, 255, 255, 0.08);
  --card: rgba(255, 255, 255, 0.03);

  --grad: linear-gradient(135deg, var(--cyan), var(--purple) 50%, var(--pink));
  --grad-soft: linear-gradient(135deg, rgba(0,240,255,.15), rgba(168,85,247,.15), rgba(236,72,153,.15));
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  overflow-x: hidden;
  /* 隐藏默认光标,改用自定义光晕(触摸设备无影响) */
  cursor: none;
}
@media (hover: none) { body { cursor: auto; } }

a { color: inherit; text-decoration: none; }
code {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  color: var(--cyan);
}

/* ============ 粒子背景 canvas ============ */
#bg-canvas {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ============ 自定义光标 ============ */
#cursor-glow {
  position: fixed;
  width: 360px; height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(168,85,247,.12), transparent 60%);
  pointer-events: none;
  z-index: 1;
  transform: translate(-50%, -50%);
  transition: opacity .3s;
  mix-blend-mode: screen;
}

/* ============ 布局 ============ */
.section {
  position: relative;
  z-index: 2;
  max-width: 960px;
  margin: 0 auto;
  padding: 6rem 1.5rem;
}

/* ============ HERO ============ */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 4rem;
}
.hero-inner { position: relative; }

.avatar {
  position: relative;
  width: 132px; height: 132px;
  margin: 0 auto 2rem;
  border-radius: 50%;
  padding: 4px;
  background: var(--grad);
  animation: spin 8s linear infinite;
}
.avatar svg { border-radius: 50%; display: block; animation: spin-reverse 8s linear infinite; }
.avatar-status {
  position: absolute; bottom: 8px; right: 8px;
  width: 18px; height: 18px;
  background: #22c55e;
  border: 3px solid var(--bg);
  border-radius: 50%;
  box-shadow: 0 0 12px #22c55e;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes spin        { to { transform: rotate(360deg); } }
@keyframes spin-reverse{ to { transform: rotate(-360deg); } }
@keyframes pulse       { 50% { box-shadow: 0 0 0 6px rgba(34,197,94,0); } }

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--muted);
  margin-bottom: 2.5rem;
  min-height: 1.5em;
}
.prompt { color: var(--cyan); margin-right: .5em; }
.caret { color: var(--cyan); animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-links { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .75rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  background: var(--grad);
  color: #05060a;
  transition: transform .2s, box-shadow .2s;
  box-shadow: 0 4px 24px rgba(168,85,247,.3);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(168,85,247,.5); }
.btn-ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
  box-shadow: none;
}
.btn-ghost:hover { border-color: var(--cyan); box-shadow: 0 0 24px rgba(0,240,255,.2); }

.scroll-hint {
  position: absolute; bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; gap: 6px;
}
.scroll-hint span {
  width: 22px; height: 22px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  animation: scroll-dot 1.5s infinite;
  opacity: 0;
}
.scroll-hint span:nth-child(2) { animation-delay: .2s; }
.scroll-hint span:nth-child(3) { animation-delay: .4s; }
@keyframes scroll-dot { 0% { opacity: 0; } 50% { opacity: .8; } 100% { opacity: 0; transform: rotate(45deg) translate(8px,8px); } }

/* ============ SECTION 标题 ============ */
.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: .5rem;
}
.hash { color: var(--cyan); }
.section-sub { color: var(--muted); margin-bottom: 3rem; }

/* ============ 技能栈 ============ */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}
.stack-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  backdrop-filter: blur(10px);
  transition: border-color .3s, transform .3s;
}
.stack-card:hover { border-color: var(--purple); transform: translateY(-4px); }
.stack-card h3 {
  font-size: .95rem;
  color: var(--cyan);
  margin-bottom: 1rem;
  font-family: "SF Mono", monospace;
  letter-spacing: .02em;
}
.tags { display: flex; flex-wrap: wrap; gap: .5rem; }
.tag {
  padding: .35rem .8rem;
  font-size: .85rem;
  border-radius: 8px;
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border);
  transition: all .2s;
}
.tag:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 12px rgba(0,240,255,.25);
}
.tags.small .tag { font-size: .75rem; padding: .25rem .6rem; }
.tagline-note { color: var(--muted); font-size: .95rem; }

/* ============ 项目卡片 ============ */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  /* 3D 透视容器 */
  perspective: 1000px;
}
.project-card {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 2rem;
  overflow: hidden;
  transform-style: preserve-3d;
  transition: transform .15s ease-out, box-shadow .3s;
}
.project-card::before {
  /* 顶部渐变描边光 */
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--grad);
  opacity: .6;
}
.project-glow {
  position: absolute; inset: 0;
  background: radial-gradient(600px circle at var(--mx,50%) var(--my,50%), rgba(168,85,247,.12), transparent 40%);
  opacity: 0; transition: opacity .3s;
  pointer-events: none;
}
.project-card:hover .project-glow { opacity: 1; }
.project-card:hover { box-shadow: 0 20px 50px rgba(0,0,0,.5); border-color: rgba(168,85,247,.4); }
.project-card h3 { font-size: 1.25rem; margin-bottom: .75rem; transform: translateZ(40px); }
.project-desc { color: var(--muted); font-size: .92rem; margin-bottom: 1.25rem; transform: translateZ(25px); }
.project-link {
  display: inline-block; margin-top: .5rem;
  color: var(--cyan);
  font-weight: 600;
  font-family: "SF Mono", monospace;
  transform: translateZ(30px);
}
.project-link.muted { color: var(--muted); }
.project-card:hover .project-link { letter-spacing: .02em; }

/* ============ 联系方式 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.contact-card {
  display: flex; align-items: center; gap: 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem;
  transition: all .3s;
}
.contact-card:hover {
  border-color: var(--cyan);
  transform: translateX(6px);
  box-shadow: -4px 0 24px rgba(0,240,255,.15);
}
.contact-icon { font-size: 1.75rem; }
.contact-label { font-size: .8rem; color: var(--muted); }
.contact-value { font-weight: 600; font-family: "SF Mono", monospace; }

/* ============ 页脚 ============ */
.footer {
  text-align: center;
  color: var(--muted);
  font-size: .9rem;
  border-top: 1px solid var(--border);
  padding-top: 3rem; padding-bottom: 3rem;
}

/* ============ 滚动渐入动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ============ 响应式 ============ */
@media (max-width: 600px) {
  .section { padding: 4rem 1.25rem; }
  #hero { min-height: 100svh; }
}

/* ============ 减少动效(无障碍) ============ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  #cursor-glow { display: none; }
  body { cursor: auto; }
}