:root {
  --bg: #0b1120;
  --bg-elevated: #151c2f;
  --bg-card: #1a2332;
  --border: rgba(148, 163, 184, 0.12);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-light: #7dd3fc;
  --accent-glow: rgba(56, 189, 248, 0.22);
  --gradient: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
  --radius: 12px;
  --radius-lg: 16px;
  --font: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
  --header-h: 64px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #0b1120;
  --bg-elevated: #151c2f;
  --bg-card: #1a2332;
  --border: rgba(148, 163, 184, 0.12);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --accent-glow: rgba(56, 189, 248, 0.22);
}

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

.container {
  width: min(1140px, 92vw);
  margin-inline: auto;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

[data-theme="light"] .bg-grid {
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
}

/* Header */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 100;
  backdrop-filter: blur(16px) saturate(180%);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 100%;
  gap: 1rem;
}

.nav__logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
  justify-self: start;
}

.nav__dot { color: var(--accent); }

.nav__links {
  display: flex;
  list-style: none;
  gap: 2rem;
  justify-self: center;
}

.nav__links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav__links a:hover { color: var(--text); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  justify-self: end;
  grid-column: 3;
}

.nav__toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* Hero */
.hero {
  position: relative;
  z-index: 1;
  padding: calc(var(--header-h) + 64px) 0 80px;
  min-height: 85vh;
  display: flex;
  align-items: center;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  width: 100%;
}

.hero__greeting {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.hero__name {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 1.5rem;
}

.hero__desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 520px;
  line-height: 1.8;
}

.hero__desc strong { color: var(--text); font-weight: 500; }

/* Avatar */
.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar {
  position: relative;
  width: 320px;
  height: 320px;
}

.avatar__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: radial-gradient(circle at 30% 30%, color-mix(in srgb, var(--accent) 15%, var(--bg-card)), var(--bg-card));
}

.avatar__inner {
  position: absolute;
  inset: 24px;
  border-radius: 50%;
  overflow: hidden;
  background: linear-gradient(145deg, #1e3a5f, #0f172a);
  border: 3px solid color-mix(in srgb, var(--accent) 35%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar__photo,
.avatar__fallback {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.avatar__photo {
  display: block;
}

.avatar__tag {
  position: absolute;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  white-space: nowrap;
  animation: float 4s ease-in-out infinite;
}

.avatar__tag--1 { top: 8%; right: -5%; animation-delay: 0s; }
.avatar__tag--2 { top: 35%; left: -12%; animation-delay: 0.5s; }
.avatar__tag--3 { bottom: 30%; right: -10%; animation-delay: 1s; }
.avatar__tag--4 { bottom: 8%; left: 5%; animation-delay: 1.5s; }
.avatar__tag--5 { top: 15%; left: 10%; animation-delay: 2s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.5rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: all var(--transition);
}

.btn--primary {
  background: var(--accent);
  color: #0f172a;
  font-weight: 600;
}

.btn--primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn--ghost:hover { border-color: var(--accent); color: var(--accent-light); }
.btn--full { width: 100%; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none !important; }

/* Sections */
.section {
  position: relative;
  z-index: 1;
  padding: 72px 0;
}

.section__header { margin-bottom: 2rem; }
.section__header--center { text-align: center; }
.section__header--left { text-align: left; }

.section__tag {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.section__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section__underline {
  width: 48px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: 0.75rem;
}

/* About + Skills */
.about-skills {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: start;
}

.about__text p {
  color: var(--text-muted);
  margin-bottom: 1.1rem;
  font-size: 0.95rem;
}

.about__text strong { color: var(--text); font-weight: 500; }

.exp-heading {
  font-size: 1rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
  color: var(--text);
}

.exp-list { display: flex; flex-direction: column; gap: 0; }

.exp-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.exp-item__time {
  font-size: 0.82rem;
  color: var(--accent-light);
  font-weight: 500;
  padding-top: 0.15rem;
}

.exp-item__body strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.15rem;
}

.exp-item__body span {
  display: block;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.exp-item__body p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.skill-groups { display: flex; flex-direction: column; gap: 1.25rem; }

.skill-group h4 {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tags span {
  font-size: 0.75rem;
  padding: 0.28rem 0.65rem;
  border-radius: 6px;
  font-weight: 500;
}

.tags--blue span { background: rgba(56,189,248,0.12); color: #38bdf8; border: 1px solid rgba(56,189,248,0.25); }
.tags--cyan span { background: rgba(34,211,238,0.12); color: #22d3ee; border: 1px solid rgba(34,211,238,0.25); }
.tags--amber span { background: rgba(251,191,36,0.12); color: #fbbf24; border: 1px solid rgba(251,191,36,0.25); }
.tags--green span { background: rgba(52,211,153,0.12); color: #34d399; border: 1px solid rgba(52,211,153,0.25); }
.tags--purple span { background: rgba(167,139,250,0.12); color: #a78bfa; border: 1px solid rgba(167,139,250,0.25); }

/* Default tags (projects) */
.project-card .tags span,
.project-hero .tags span {
  background: rgba(56,189,248,0.1);
  color: var(--accent-light);
  border: 1px solid rgba(56,189,248,0.2);
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}

.project-card:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.25);
}

.project-card__cover {
  display: flex;
  align-items: flex-end;
  height: 200px;
  position: relative;
  text-decoration: none;
  overflow: hidden;
  background-color: #0b1120;
  background-image: var(--cover-img);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transition: transform 0.4s ease;
}

.project-card__cover::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(11, 17, 32, 0.45) 78%, rgba(11, 17, 32, 0.88) 100%);
  pointer-events: none;
}

.project-card__cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 38%, rgba(255, 255, 255, 0.06), transparent 55%);
  pointer-events: none;
}

.project-card__cover-title {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 0.85rem 1.1rem 1rem;
  font-size: 1.12rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: #fff;
  text-align: left;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.5);
}

.project-card:hover .project-card__cover {
  transform: scale(1.03);
}

/* 各项目封面渐变兜底（微信内 SVG 背景不加载时仍美观） */
.project-card__cover--flutter-super-app {
  background-color: #0c1929;
  background-image: var(--cover-img), linear-gradient(135deg, #0c1929 0%, #1e3a8a 55%, #3b82f6 100%);
}
.project-card__cover--ink-mind {
  background-color: #1e1b4b;
  background-image: var(--cover-img), linear-gradient(135deg, #1e1b4b 0%, #581c87 55%, #7c3aed 100%);
}
.project-card__cover--rescue-platform {
  background-color: #431407;
  background-image: var(--cover-img), linear-gradient(135deg, #431407 0%, #9a3412 55%, #ea580c 100%);
}
.project-card__cover--openclaw-py {
  background-color: #042f2e;
  background-image: var(--cover-img), linear-gradient(135deg, #042f2e 0%, #164e63 55%, #0891b2 100%);
}
.project-card__cover--arkts-starter {
  background-color: #500724;
  background-image: var(--cover-img), linear-gradient(135deg, #500724 0%, #9d174d 55%, #db2777 100%);
}
.project-card__cover--push-platform-mvp {
  background-color: #022c22;
  background-image: var(--cover-img), linear-gradient(135deg, #022c22 0%, #0f766e 55%, #2dd4bf 100%);
}

.project-card__body {
  padding: 1rem 1.25rem 1.25rem;
}

.project-card__subtitle {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 0.55rem;
  line-height: 1.4;
}

.project-card__title {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  margin-bottom: 0.65rem;
  line-height: 1.4;
  transition: color var(--transition);
}

.project-card__title:hover { color: var(--accent-light); }

.project-card__body p {
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.6;
  margin-bottom: 0.85rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card__footer {
  display: flex;
  justify-content: flex-start;
  margin-top: 0.5rem;
}

.project-card__source {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all var(--transition);
}

.project-card__source:hover {
  color: var(--accent-light);
  border-color: var(--accent);
}

.projects-more {
  text-align: center;
  margin-top: 2.5rem;
}

/* Contact */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact__info p {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.contact__methods { display: flex; flex-direction: column; gap: 1.1rem; }

.contact__method {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.contact__label {
  font-size: 0.78rem;
  color: var(--text-muted);
  min-width: 48px;
}

.contact__value {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}

.contact__value:hover { color: var(--accent-light); }

.copy-btn {
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  cursor: pointer;
  font-family: inherit;
}

.copy-btn:hover { border-color: var(--accent); color: var(--accent-light); }

.contact__form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.contact__form h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.form-group { margin-bottom: 1.1rem; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.92rem;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea { resize: vertical; min-height: 110px; }

/* Footer */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 1.75rem 0;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer a { color: var(--text-muted); text-decoration: none; }
.footer a:hover { color: var(--accent-light); }

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-size: 0.9rem;
  opacity: 0;
  transition: all 0.35s ease;
  z-index: 200;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 960px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .about-skills { grid-template-columns: 1fr; gap: 2.5rem; }
}

@media (max-width: 768px) {
  .nav { grid-template-columns: 1fr auto; }
  .nav__toggle { display: flex; }

  .nav__links {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 1rem;
    transform: translateY(-120%);
    opacity: 0;
    transition: all var(--transition);
    grid-column: 1 / -1;
    justify-self: stretch;
  }

  .nav__links.open { transform: translateY(0); opacity: 1; }

  .hero__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
  }

  .hero__desc { margin-inline: auto; }
  .hero__visual { order: -1; }
  .avatar { width: 240px; height: 240px; }

  .projects-grid { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: 1fr; }
  .exp-item { grid-template-columns: 1fr; gap: 0.35rem; }
}