/* ===== Reset & Base ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #fff;
  background: #030712;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; transition: .25s ease; }
img { max-width: 100%; display: block; }

/* ===== Navigation Bar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 40px; height: 64px;
  background: rgba(3, 7, 18, .72);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  transition: background .3s;
}
.navbar .logo {
  font-size: 20px; font-weight: 700; letter-spacing: 2px;
  color: #fff;
}
.navbar .logo span { color: #60a5fa; }
.nav-links { display: flex; gap: 6px; list-style: none; }
.nav-links a {
  padding: 8px 18px; border-radius: 999px; font-size: 14px;
  font-weight: 500; letter-spacing: .5px;
  color: rgba(255,255,255,.75);
  transition: .25s ease;
}
.nav-links a:hover,
.nav-links a.active {
  color: #fff; background: rgba(255,255,255,.1);
}

/* Mobile menu toggle */
.menu-toggle { display: none; background: none; border: none; color: #fff; font-size: 24px; cursor: pointer; }

/* ===== Hero Section (shared across pages) ===== */
.hero {
  min-height: 100vh; position: relative;
  display: flex; align-items: center; justify-content: center;
  padding: 100px 20px 60px; overflow: hidden;
  background-image:
    linear-gradient(rgba(0,0,0,.34), rgba(0,0,0,.72)),
    url("https://lieomh-personal-assets.oss-ap-southeast-1.aliyuncs.com/personal-site/images/space-bg.jpg");
  background-size: cover; background-position: center; background-attachment: fixed;
}
.hero-short {
  min-height: 60vh;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background:
    radial-gradient(circle at 30% 50%, rgba(59,130,246,.12), transparent 40%),
    radial-gradient(circle at 70% 40%, rgba(139,92,246,.1), transparent 35%),
    linear-gradient(180deg, rgba(0,0,0,.05), rgba(0,0,0,.7));
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 72px 72px; opacity: .2;
}
.hero-content {
  position: relative; z-index: 2;
  width: min(900px, 100%); text-align: center;
  animation: fadeUp .9s ease both;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== Avatar ===== */
.avatar {
  width: 148px; height: 148px; margin: 0 auto 28px;
  border-radius: 50%;
  border: 4px solid rgba(255,255,255,.85);
  background: url("https://lieomh-personal-assets.oss-ap-southeast-1.aliyuncs.com/personal-site/images/avatar.jpg") center/cover;
  box-shadow: 0 20px 60px rgba(0,0,0,.5), 0 0 0 10px rgba(255,255,255,.07);
}

/* ===== Typography ===== */
.hero h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(42px, 7vw, 78px);
  line-height: 1.05; letter-spacing: 4px;
  text-shadow: 0 10px 30px rgba(0,0,0,.6);
}
.subtitle {
  margin-top: 14px;
  font-size: clamp(15px, 2vw, 21px);
  letter-spacing: 6px; color: rgba(255,255,255,.8);
  text-transform: uppercase;
}
.divider {
  width: min(500px, 80%); height: 1px;
  margin: 28px auto;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.7), transparent);
}
.hero-desc {
  max-width: 700px; margin: 0 auto 36px;
  font-size: clamp(15px, 1.8vw, 19px);
  line-height: 1.9; color: rgba(255,255,255,.92);
  text-shadow: 0 6px 20px rgba(0,0,0,.6);
}
.hero-desc strong { color: #bfdbfe; }

/* ===== Buttons ===== */
.btn-group {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 14px;
  margin-bottom: 24px;
}
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  min-width: 110px; padding: 12px 24px;
  border: 1px solid rgba(255,255,255,.65);
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(12px);
  font-size: 15px; font-weight: 600; letter-spacing: 1px;
  color: #fff; cursor: pointer; transition: .25s ease;
}
.btn:hover {
  color: #0f172a; background: rgba(255,255,255,.92);
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(0,0,0,.3);
}
.btn-primary {
  background: rgba(59,130,246,.85); border-color: rgba(59,130,246,.9);
}
.btn-primary:hover {
  background: #3b82f6; color: #fff;
}

/* ===== Icon Row ===== */
.icon-row {
  display: flex; justify-content: center; gap: 14px; flex-wrap: wrap;
}
.icon-row a, .icon-row span {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.4);
  background: rgba(255,255,255,.08);
  color: rgba(255,255,255,.88);
  backdrop-filter: blur(10px);
  font-size: 18px; transition: .25s ease;
}
.icon-row a:hover, .icon-row span:hover {
  background: rgba(255,255,255,.92); color: #0f172a;
  transform: translateY(-3px);
}

/* ===== Content Panels ===== */
.panel {
  padding: 80px 20px;
  background: #f8fafc; color: #1e293b;
}
.panel-dark {
  background: #0f172a; color: #e2e8f0;
}
.wrap { width: min(1100px, 100%); margin: 0 auto; }

.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 {
  font-size: 34px; color: #0f172a; margin-bottom: 10px;
  position: relative; display: inline-block;
}
.panel-dark .section-header h2 { color: #f1f5f9; }
.section-header h2::after {
  content: ""; display: block;
  width: 48px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, #3b82f6, #8b5cf6);
  margin: 12px auto 0;
}
.section-header p { color: #64748b; font-size: 16px; }
.panel-dark .section-header p { color: #94a3b8; }

/* ===== Cards Grid ===== */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  background: #fff; border: 1px solid #e2e8f0; border-radius: 20px;
  padding: 28px; box-shadow: 0 10px 30px rgba(15,23,42,.06);
  transition: transform .3s, box-shadow .3s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(15,23,42,.1);
}
.card-dark {
  background: rgba(255,255,255,.05); border-color: rgba(255,255,255,.1);
}
.card-dark:hover { background: rgba(255,255,255,.08); }
.card h3 { color: #0f3d7f; font-size: 20px; margin-bottom: 12px; }
.card-dark h3 { color: #93c5fd; }
.card p, .card li { color: #5f6b7a; line-height: 1.85; font-size: 15px; }
.card-dark p, .card-dark li { color: #94a3b8; }
.card ul { padding-left: 18px; }
.card.wide { grid-column: span 2; }

/* ===== Tags ===== */
.tag-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.tag {
  padding: 7px 14px; border-radius: 999px;
  background: #eef4ff; color: #1d4ed8;
  font-weight: 600; font-size: 13px;
  border: 1px solid #dbeafe;
}
.card-dark .tag {
  background: rgba(59,130,246,.15); color: #93c5fd;
  border-color: rgba(59,130,246,.3);
}

/* ===== Timeline ===== */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 4px; bottom: 4px;
  width: 2px; background: linear-gradient(180deg, #3b82f6, #8b5cf6);
  border-radius: 1px;
}
.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item::before {
  content: ""; position: absolute; left: -28px; top: 6px;
  width: 12px; height: 12px; border-radius: 50%;
  background: #3b82f6; border: 3px solid #f8fafc;
}
.panel-dark .timeline-item::before { border-color: #0f172a; }
.timeline-item h3 { font-size: 18px; color: #0f172a; margin-bottom: 4px; }
.panel-dark .timeline-item h3 { color: #f1f5f9; }
.timeline-item .time { font-size: 13px; color: #94a3b8; margin-bottom: 8px; }
.timeline-item p { font-size: 15px; color: #64748b; line-height: 1.8; }
.panel-dark .timeline-item p { color: #94a3b8; }

/* ===== Contact Form Look ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact-info-card {
  padding: 36px; border-radius: 20px;
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1);
}
.contact-item { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 28px; }
.contact-item:last-child { margin-bottom: 0; }
.contact-icon {
  width: 48px; height: 48px; flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 14px;
  background: rgba(59,130,246,.15); color: #60a5fa;
  font-size: 22px;
}
.contact-item h4 { font-size: 16px; color: #f1f5f9; margin-bottom: 4px; }
.contact-item p { font-size: 14px; color: #94a3b8; }
.contact-item a { color: #60a5fa; }
.contact-item a:hover { text-decoration: underline; }

.contact-form {
  display: flex; flex-direction: column; gap: 16px;
  padding: 36px; border-radius: 20px;
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1);
}
.contact-form label { font-size: 14px; color: #94a3b8; margin-bottom: 2px; }
.contact-form input,
.contact-form textarea {
  width: 100%; padding: 12px 16px;
  border-radius: 12px; border: 1px solid rgba(255,255,255,.15);
  background: rgba(255,255,255,.05); color: #e2e8f0;
  font-size: 15px; font-family: inherit;
  transition: border-color .2s;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none; border-color: #3b82f6;
}
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-form .btn { align-self: flex-start; }

/* ===== Footer ===== */
.footer {
  text-align: center; padding: 32px 20px;
  background: #020617; color: #64748b;
  font-size: 13px; border-top: 1px solid rgba(255,255,255,.06);
}
.footer a { color: #60a5fa; }
.footer a:hover { text-decoration: underline; }

/* ===== Page-specific hero heights ===== */
.hero-page {
  min-height: 40vh; padding: 120px 20px 60px;
}
.hero-page h1 { font-size: clamp(32px, 5vw, 54px); }
.hero-page .subtitle { letter-spacing: 4px; font-size: clamp(14px, 1.6vw, 18px); }

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .navbar { padding: 0 20px; }
  .nav-links {
    display: none; flex-direction: column; gap: 0;
    position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(3,7,18,.95); backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(255,255,255,.08);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 24px; border-radius: 0; }
  .menu-toggle { display: block; }

  .cards { grid-template-columns: 1fr; }
  .card.wide { grid-column: span 1; }
  .contact-grid { grid-template-columns: 1fr; }
  .avatar { width: 120px; height: 120px; }
  .hero { background-attachment: scroll; }
}
/* ===== OSS迁移后布局修复：导航栏 + 首页居中 ===== */

.navbar,
.topbar {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  z-index: 9999 !important;
  height: 64px !important;
  padding: 0 40px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  background: rgba(3, 7, 18, 0.82) !important;
  backdrop-filter: blur(14px) !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08) !important;
}

.logo,
.navbar .logo,
.brand,
.topbar .brand {
  color: #fff !important;
  font-size: 18px !important;
  font-weight: 800 !important;
  letter-spacing: 1px !important;
  text-decoration: none !important;
}

.navbar ul,
.nav-links,
.topnav {
  list-style: none !important;
  margin: 0 !important;
  padding: 0 !important;
  display: flex !important;
  align-items: center !important;
  justify-content: flex-end !important;
  gap: 12px !important;
}

.navbar li,
.nav-links li,
.topnav li {
  list-style: none !important;
  margin: 0 !important;
  padding: 0 !important;
}

.navbar a,
.nav-links a,
.topnav a {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 8px 16px !important;
  border-radius: 999px !important;
  color: rgba(255, 255, 255, 0.88) !important;
  text-decoration: none !important;
  font-size: 14px !important;
  background: transparent !important;
  transition: all 0.25s ease !important;
}

.navbar a:hover,
.navbar a.active,
.nav-links a:hover,
.nav-links a.active,
.topnav a:hover,
.topnav a.active {
  color: #fff !important;
  background: rgba(255, 255, 255, 0.14) !important;
}

.menu-toggle {
  display: none !important;
}

.hero {
  min-height: 100vh !important;
  padding: 64px 20px 40px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  text-align: center !important;
}

.hero .content,
.content {
  width: min(880px, 92%) !important;
  margin: 0 auto !important;
  text-align: center !important;
  position: relative !important;
  z-index: 5 !important;
  transform: none !important;
}

.avatar {
  margin-left: auto !important;
  margin-right: auto !important;
}

.main-nav {
  display: flex !important;
  justify-content: center !important;
  align-items: center !important;
  flex-wrap: wrap !important;
  gap: 14px !important;
  margin-top: 24px !important;
}

.icons {
  display: flex !important;
  justify-content: center !important;
  align-items: center !important;
  gap: 12px !important;
  margin-top: 18px !important;
}

@media (max-width: 768px) {
  .navbar,
  .topbar {
    height: auto !important;
    min-height: 60px !important;
    padding: 12px 18px !important;
  }

  .navbar ul,
  .nav-links,
  .topnav {
    gap: 6px !important;
  }

  .navbar a,
  .nav-links a,
  .topnav a {
    padding: 6px 10px !important;
    font-size: 13px !important;
  }
}