/* ===========================
   ROOT & RESET
   =========================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #080b14;
  --bg-secondary: #0d1120;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.07);
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.18);
  --text-primary: #f0f4ff;
  --text-secondary: #8892a4;
  --text-muted: #4a5568;
  --accent-blue: #4f8eff;
  --accent-purple: #8b5cf6;
  --accent-cyan: #22d3ee;
  --accent-green: #10b981;
  --accent-pink: #ec4899;
  --gradient-main: linear-gradient(135deg, #4f8eff 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-text: linear-gradient(135deg, #4f8eff, #8b5cf6, #ec4899);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-card: 0 4px 40px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 60px rgba(79,142,255,0.15);
  --font-sans: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ===========================
   UTILITIES
   =========================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section {
  padding: 120px 0;
}

.section-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-label::after {
  content: '';
  flex: 1;
  max-width: 60px;
  height: 1px;
  background: var(--accent-blue);
  opacity: 0.4;
}
.section-label.light { color: rgba(255,255,255,0.5); }
.section-label.light::after { background: rgba(255,255,255,0.3); }

.section-title {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.section-title.center { text-align: center; }

.section-sub {
  font-size: 18px;
  color: var(--text-secondary);
  margin-top: 16px;
  max-width: 600px;
}
.section-sub.center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

/* ===========================
   NAVBAR
   =========================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 24px;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(8, 11, 20, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}
.nav-logo .dot { color: var(--accent-blue); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  background: rgba(8, 11, 20, 0.98);
  border-top: 1px solid var(--border);
  padding: 16px 0;
}
.mobile-menu.open { display: flex; }
.mobile-link {
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.mobile-link:last-child { border-bottom: none; }
.mobile-link:hover { color: var(--text-primary); background: var(--bg-card); }

/* ===========================
   HERO
   =========================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 120px 24px 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(79,142,255,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139,92,246,0.1) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 30%, black 0%, transparent 100%);
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.2;
}
.orb-1 {
  width: 600px; height: 600px;
  background: var(--accent-blue);
  top: -200px; left: -100px;
  animation: orbFloat1 8s ease-in-out infinite;
}
.orb-2 {
  width: 400px; height: 400px;
  background: var(--accent-purple);
  top: 30%; right: -100px;
  animation: orbFloat2 10s ease-in-out infinite;
}
.orb-3 {
  width: 300px; height: 300px;
  background: var(--accent-cyan);
  bottom: 0; left: 30%;
  animation: orbFloat3 6s ease-in-out infinite;
}

@keyframes orbFloat1 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, 40px); }
}
@keyframes orbFloat2 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-20px, 30px); }
}
@keyframes orbFloat3 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(40px, -20px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
  flex: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(79,142,255,0.1);
  border: 1px solid rgba(79,142,255,0.25);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-blue);
  margin-bottom: 28px;
}

.badge-dot {
  width: 8px; height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.8); }
}

.hero-name {
  font-size: clamp(52px, 9vw, 88px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  background: linear-gradient(135deg, #ffffff 0%, rgba(255,255,255,0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 20px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 18px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 32px;
}
.br-hide { display: none; }

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}
.tag {
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: var(--transition);
}
.tag:hover {
  background: rgba(79,142,255,0.1);
  border-color: rgba(79,142,255,0.3);
  color: var(--accent-blue);
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  background: var(--gradient-main);
  color: #fff;
  transition: var(--transition);
  box-shadow: 0 4px 24px rgba(79,142,255,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(79,142,255,0.4);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.btn-ghost:hover {
  background: var(--bg-card);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.hero-visual {
  position: relative;
  z-index: 2;
  flex-shrink: 0;
  margin-left: auto;
  padding-left: 60px;
}

.ai-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 320px;
  backdrop-filter: blur(20px);
  box-shadow: 0 8px 60px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.05) inset;
}

.floating {
  animation: floating 4s ease-in-out infinite;
}
@keyframes floating {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

.ai-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.ai-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.ai-dot.green {
  background: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulse 2s ease infinite;
}

.code-line {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.code-line:last-child { border-bottom: none; }
.kw { color: var(--accent-blue); font-weight: 600; min-width: 70px; }
.op { color: var(--text-muted); }
.val { color: var(--text-secondary); }
.val.highlight { color: var(--accent-green); font-weight: 600; }

.scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent-blue), transparent);
  animation: scrollAnim 2s ease infinite;
}
@keyframes scrollAnim {
  0% { opacity: 1; transform: scaleY(1) translateY(0); }
  100% { opacity: 0; transform: scaleY(0.3) translateY(20px); }
}

/* ===========================
   ABOUT
   =========================== */
.about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 80px;
  align-items: center;
  margin-top: 48px;
}

.about-desc {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.about-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.stat-item { display: flex; flex-direction: column; gap: 4px; }
.stat-num {
  font-size: 36px;
  font-weight: 900;
  letter-spacing: -0.03em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.skill-chip {
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
}
.chip-blue { background: rgba(79,142,255,0.1); color: var(--accent-blue); border-color: rgba(79,142,255,0.2); }
.chip-purple { background: rgba(139,92,246,0.1); color: #a78bfa; border-color: rgba(139,92,246,0.2); }
.chip-green { background: rgba(16,185,129,0.1); color: var(--accent-green); border-color: rgba(16,185,129,0.2); }
.chip-orange { background: rgba(245,158,11,0.1); color: #fbbf24; border-color: rgba(245,158,11,0.2); }
.chip-pink { background: rgba(236,72,153,0.1); color: var(--accent-pink); border-color: rgba(236,72,153,0.2); }
.chip-teal { background: rgba(34,211,238,0.1); color: var(--accent-cyan); border-color: rgba(34,211,238,0.2); }

/* ===========================
   WORKFLOW (核心流程)
   =========================== */
.workflow {
  background: var(--bg-primary);
  overflow: hidden;
}

.flow-diagram {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin: 64px 0;
  overflow-x: auto;
  padding: 4px;
  scrollbar-width: none;
}
.flow-diagram::-webkit-scrollbar { display: none; }

.flow-step {
  flex: 1;
  min-width: 220px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: var(--transition);
  cursor: default;
  position: relative;
  overflow: hidden;
}
.flow-step::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-main);
  opacity: 0;
  transition: var(--transition);
}
.flow-step:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
}
.flow-step:hover::before { opacity: 1; }

.flow-icon { font-size: 36px; margin-bottom: 16px; }
.flow-num {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--accent-blue);
  margin-bottom: 8px;
  opacity: 0.7;
}
.flow-content h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.flow-content p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.flow-arrow {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  padding: 0 16px;
  font-size: 24px;
  color: var(--text-muted);
  font-weight: 300;
}

/* Principles */
.principle-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
}

.principle-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.principle-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.principle-card.featured {
  background: linear-gradient(135deg, rgba(79,142,255,0.08) 0%, rgba(139,92,246,0.08) 100%);
  border-color: rgba(79,142,255,0.3);
  box-shadow: 0 0 60px rgba(79,142,255,0.08);
}

.featured-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.05em;
}

.principle-icon { font-size: 40px; margin-bottom: 20px; }
.principle-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.principle-card p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ===========================
   PROJECTS (项目记录)
   =========================== */
.projects {
  background: var(--bg-secondary);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.share-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.share-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-main);
  opacity: 0;
  transition: var(--transition);
}
.share-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.share-card:hover::before { opacity: 1; }

.featured-card {
  background: linear-gradient(135deg, rgba(79,142,255,0.06) 0%, rgba(139,92,246,0.06) 100%);
  border-color: rgba(79,142,255,0.2);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-cat {
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 100px;
  letter-spacing: 0.05em;
}
.cat-prompt { background: rgba(79,142,255,0.12); color: var(--accent-blue); }
.cat-workflow { background: rgba(16,185,129,0.12); color: var(--accent-green); }
.cat-product { background: rgba(139,92,246,0.12); color: #a78bfa; }
.cat-tool { background: rgba(245,158,11,0.12); color: #fbbf24; }

.card-date { font-size: 12px; color: var(--text-muted); font-weight: 500; }

.card-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.card-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  flex: 1;
  margin-bottom: 20px;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.card-tags span {
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  background: rgba(255,255,255,0.05);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ===========================
   CONTACT (简化版)
   =========================== */
.contact {
  background: var(--bg-primary);
}

.contact-card-simple {
  text-align: center;
  padding: 40px 0;
}

.contact-links-center {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}
.contact-link:hover {
  background: rgba(79,142,255,0.08);
  border-color: rgba(79,142,255,0.25);
  color: var(--text-primary);
}
.cl-icon { font-size: 18px; flex-shrink: 0; }

/* ===========================
   FOOTER
   =========================== */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-logo {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.03em;
}
.footer-logo .dot { color: var(--accent-blue); }
.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--accent-blue); }

.footer-icp {
  text-align: center;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.footer-icp a {
  font-size: 12px;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-icp a:hover {
  color: var(--text-secondary);
}

/* ===========================
   ANIMATIONS — SCROLL REVEAL
   =========================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 1024px) {
  .principle-grid { grid-template-columns: 1fr 1fr; }
  .cards-grid { grid-template-columns: 1fr 1fr; }
  .about-grid { gap: 48px; }
  .hero-visual { display: none; }
  .flow-diagram { gap: 8px; }
}

@media (max-width: 768px) {
  .section { padding: 80px 0; }

  .nav-links { display: none; }
  .hamburger { display: flex; }

  .hero {
    padding: 100px 20px 60px;
    min-height: auto;
  }
  .hero-name { font-size: clamp(44px, 12vw, 72px); }

  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-stats { gap: 24px; }

  .principle-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }

  .flow-diagram {
    flex-direction: column;
  }
  .flow-arrow { transform: rotate(90deg); align-self: center; padding: 4px 0; }

  .contact-links-center { flex-direction: column; align-items: center; }

  .footer-inner { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }

  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-ghost { justify-content: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .about-stats { flex-direction: column; gap: 16px; }
  .flow-step { min-width: auto; }
}