/* === Variables === */
:root {
  --bg: #fafbfc;
  --bg-alt: #f0f2f5;
  --text: #1a1f36;
  --text-secondary: #4b5563;
  --accent: #1c2541;
  --accent-light: #2e4068;
  --accent-dark: #141c30;
  --accent-bg: rgba(28, 37, 65, 0.06);
  --accent-gold: #b8965a;
  --accent-gold-bg: rgba(184, 150, 90, 0.08);
  --card-bg: #ffffff;
  --card-border: #e2e5ea;
  --card-shadow: 0 2px 8px rgba(0,0,0,0.04);
  --nav-bg: rgba(250, 251, 252, 0.90);
  --radius: 10px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
  --font: 'Space Grotesk', 'Noto Sans SC', -apple-system, sans-serif;
}

[data-theme="dark"] {
  --bg: #0c1019;
  --bg-alt: #121825;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --accent: #7b9acc;
  --accent-light: #a3bee0;
  --accent-dark: #5a7db5;
  --accent-bg: rgba(123, 154, 204, 0.1);
  --accent-gold: #d4ad6a;
  --accent-gold-bg: rgba(212, 173, 106, 0.1);
  --card-bg: #1a2030;
  --card-border: #2a3348;
  --card-shadow: 0 2px 8px rgba(0,0,0,0.2);
  --nav-bg: rgba(12, 16, 25, 0.90);
}

/* === Reset === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* === Nav === */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--card-border);
  transition: background var(--transition);
}

.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-size: 1.2rem; font-weight: 700; letter-spacing: 1px;
  color: var(--accent) !important;
}

.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links a {
  color: var(--text-secondary); font-size: 0.85rem; font-weight: 500;
  letter-spacing: 0.3px;
}
.nav-links a:hover { color: var(--accent); }

.theme-toggle, .lang-toggle {
  background: none; border: none; color: var(--text-secondary);
  cursor: pointer; font-size: 0.95rem; padding: 6px;
  transition: color var(--transition); font-family: var(--font);
}
.theme-toggle:hover, .lang-toggle:hover { color: var(--accent); }

.lang-toggle {
  border: 1px solid var(--card-border); padding: 3px 10px;
  border-radius: 6px; font-size: 0.8rem; font-weight: 500;
  white-space: nowrap;
}
.lang-toggle:hover { border-color: var(--accent); }

.mobile-controls { display: none; align-items: center; gap: 8px; }
.mobile-menu-btn {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 6px;
}
.mobile-menu-btn span {
  display: block; width: 20px; height: 2px;
  background: var(--text-secondary); transition: var(--transition);
}

.mobile-menu {
  display: none; position: fixed; top: 60px; left: 0; right: 0;
  background: var(--card-bg); border-bottom: 1px solid var(--card-border);
  padding: 16px 24px; z-index: 99;
  flex-direction: column; gap: 16px;
}
.mobile-menu a { color: var(--text); font-weight: 500; }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-controls { display: flex; }
  .mobile-menu-btn { display: flex; }
  .mobile-menu.active { display: flex; }
}

/* === Hero === */
.hero {
  min-height: 100vh; display: flex; flex-direction: column;
  justify-content: center; align-items: center;
  padding: 120px 24px 60px;
  position: relative; overflow: hidden;
  text-align: center;
}

.hero-bg-pattern {
  position: absolute; inset: 0; opacity: 0.03;
  background-image:
    radial-gradient(circle at 20% 50%, var(--accent) 1px, transparent 1px),
    radial-gradient(circle at 80% 20%, var(--accent) 1px, transparent 1px),
    radial-gradient(circle at 60% 80%, var(--accent) 1px, transparent 1px);
  background-size: 60px 60px, 80px 80px, 100px 100px;
}

.hero-content { position: relative; max-width: 700px; }

.hero-avatar {
  width: 140px; height: 140px; border-radius: 20px;
  overflow: hidden; margin: 0 auto 28px;
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 6px var(--accent-bg), 0 8px 24px rgba(0,0,0,0.1);
}
.hero-avatar img {
  width: 100%; height: 100%; object-fit: cover;
  object-position: center 15%;
}

.hero-badge {
  display: inline-block;
  font-size: 0.82rem; font-weight: 600; letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent); background: var(--accent-bg);
  padding: 6px 18px; border-radius: 20px;
  margin-bottom: 24px;
}

.hero-name {
  font-size: 3.8rem; font-weight: 700; letter-spacing: -1px;
  line-height: 1.1; margin-bottom: 4px;
}

.hero-name-cn {
  font-size: 1.6rem; color: var(--text-secondary);
  font-weight: 400; margin-bottom: 24px;
}

.hero-desc {
  color: var(--text-secondary); font-size: 1.05rem;
  max-width: 580px; margin: 0 auto 32px; line-height: 1.8;
}
.hero-desc strong { color: var(--text); }

.hero-links {
  display: flex; gap: 12px; justify-content: center;
  flex-wrap: wrap; margin-bottom: 48px;
}

.hero-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 8px;
  font-weight: 600; font-size: 0.88rem; letter-spacing: 0.3px;
  border: 1px solid var(--card-border);
  color: var(--text); background: var(--card-bg);
  transition: all var(--transition);
}
.hero-btn:hover {
  border-color: var(--accent); color: var(--accent);
  transform: translateY(-2px); box-shadow: 0 4px 12px rgba(28,37,65,0.15);
}
.hero-btn-primary {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.hero-btn-primary:hover { background: var(--accent-light); color: #fff; }

.hero-badge {
  background: var(--accent); color: var(--accent-gold);
}

.hero-stats {
  display: flex; justify-content: center; gap: 48px;
}
.stat-item { text-align: center; }
.stat-number {
  display: block; font-size: 2rem; font-weight: 700;
  color: var(--accent); line-height: 1.2;
}
.stat-label {
  font-size: 0.78rem; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.5px; font-weight: 500;
}

.scroll-hint {
  margin-top: 48px; animation: bounce 2s infinite;
  color: var(--text-secondary); font-size: 1.1rem;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

@media (max-width: 768px) {
  .hero-name { font-size: 2.6rem; }
  .hero-stats { gap: 24px; }
  .stat-number { font-size: 1.5rem; }
}

/* === Sections === */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
  font-size: 1.8rem; font-weight: 700; letter-spacing: -0.5px;
  margin-bottom: 48px; text-align: center;
  position: relative;
}
.section-title::after {
  content: ''; display: block; width: 32px; height: 3px;
  background: var(--accent); margin: 10px auto 0;
  border-radius: 2px;
}

/* === About === */
.about-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.about-card {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--card-shadow);
  display: flex;
  transition: transform var(--transition), box-shadow var(--transition);
}
.about-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.about-card.full-width { grid-column: 1 / -1; }

.card-accent {
  width: 4px; background: linear-gradient(180deg, var(--accent), var(--accent-light));
  flex-shrink: 0;
}

.card-body { padding: 24px; flex: 1; }
.card-body > i {
  font-size: 1.3rem; color: var(--accent); margin-bottom: 12px; display: block;
}
.card-body h3 { font-size: 1.1rem; margin-bottom: 12px; }
.card-body p {
  color: var(--text-secondary); font-size: 0.9rem;
  margin-bottom: 10px; line-height: 1.7;
}

.skills-grid { display: flex; flex-direction: column; gap: 16px; }
.skill-group h4 {
  font-size: 0.82rem; font-weight: 600; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.skills-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.skills-tags span {
  padding: 4px 12px; border-radius: 6px; font-size: 0.78rem;
  background: var(--accent-bg); color: var(--accent); font-weight: 500;
}

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-card.full-width { grid-column: 1; }
}

/* === Experience === */
.exp-cards {
  display: flex; flex-direction: column; gap: 20px;
  max-width: 800px; margin: 0 auto;
}

.exp-card {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius-lg); padding: 28px;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.exp-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.exp-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px; flex-wrap: wrap; gap: 8px;
}

.exp-date {
  font-size: 0.82rem; color: var(--accent); font-weight: 600;
}

.exp-type {
  font-size: 0.7rem; font-weight: 600; padding: 3px 10px;
  border-radius: 4px; text-transform: uppercase; letter-spacing: 0.5px;
}
.rmb-tag { background: var(--accent-gold-bg); color: var(--accent-gold); }
.pe-tag { background: var(--accent-bg); color: var(--accent); }
.ir-tag { background: rgba(100, 116, 145, 0.12); color: #647491; }

.exp-card h3 { font-size: 1.1rem; margin-bottom: 4px; }
.exp-company { color: var(--text-secondary); font-size: 0.88rem; margin-bottom: 14px; }

.exp-card ul { padding-left: 18px; }
.exp-card li {
  color: var(--text-secondary); font-size: 0.86rem;
  margin-bottom: 6px; line-height: 1.65;
}
.exp-card li strong { color: var(--text); }

.exp-details { display: flex; flex-direction: column; gap: 14px; }
.exp-section h4 {
  font-size: 0.8rem; font-weight: 600; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px;
}

/* === Projects === */
.projects-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius-lg); padding: 28px;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex; flex-direction: column;
}
.project-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.project-card.featured {
  border-color: var(--accent);
  border-width: 1.5px;
}

.featured-badge {
  display: inline-block; width: fit-content;
  font-size: 0.7rem; font-weight: 600; color: var(--accent);
  background: var(--accent-bg); padding: 3px 10px;
  border-radius: 4px; margin-bottom: 12px;
  text-transform: uppercase; letter-spacing: 0.5px;
}

.project-icon {
  font-size: 1.6rem; color: var(--accent); margin-bottom: 14px;
}
.project-card h3 { font-size: 1.05rem; margin-bottom: 10px; }
.project-card p {
  color: var(--text-secondary); font-size: 0.86rem;
  flex: 1; margin-bottom: 14px; line-height: 1.65;
}

.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.project-tags span {
  padding: 3px 10px; border-radius: 6px; font-size: 0.72rem;
  background: var(--accent-bg); color: var(--accent); font-weight: 500;
}

/* === Investment Matrix === */
.insights-subtitle {
  text-align: center; color: var(--text-secondary);
  margin: -24px auto 40px; font-size: 0.95rem;
}

.matrix-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 16px; max-width: 800px; margin: 0 auto;
}

.matrix-card {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 24px;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
}
.matrix-card:hover { transform: translateY(-2px); }

.matrix-label {
  display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap;
}
.matrix-app, .matrix-tech {
  font-size: 0.68rem; font-weight: 600; padding: 2px 8px;
  border-radius: 4px; text-transform: uppercase; letter-spacing: 0.3px;
}
.matrix-app { background: rgba(59, 130, 246, 0.1); color: #3b82f6; }
.matrix-tech { background: rgba(168, 85, 247, 0.1); color: #a855f7; }

.matrix-card h4 { font-size: 1rem; margin-bottom: 8px; }
.matrix-card p {
  color: var(--text-secondary); font-size: 0.84rem;
  line-height: 1.6; margin-bottom: 12px;
}

.matrix-verdict {
  font-size: 0.78rem; font-weight: 600; padding: 4px 12px;
  border-radius: 4px; display: inline-block;
  background: rgba(239, 68, 68, 0.1); color: #ef4444;
}
.matrix-verdict.positive { background: rgba(16, 185, 129, 0.1); color: var(--accent-dark); }
.matrix-verdict.caution { background: rgba(245, 158, 11, 0.1); color: #f59e0b; }

.red-ocean { border-left: 3px solid #8b4c4c; }
.blue-ocean { border-left: 3px solid var(--accent-gold); }
.early-stage { border-left: 3px solid #7a8599; }
.frontier { border-left: 3px solid var(--accent); }

@media (max-width: 768px) {
  .matrix-grid { grid-template-columns: 1fr; }
}

/* === Market === */
.market-cards {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.market-card {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 24px; text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition);
}
.market-card:hover { transform: translateY(-2px); }
.market-card i {
  font-size: 1.5rem; color: var(--accent); margin-bottom: 14px;
}
.market-card h4 { font-size: 0.95rem; margin-bottom: 10px; }
.market-card p {
  color: var(--text-secondary); font-size: 0.84rem; line-height: 1.65;
}

@media (max-width: 768px) {
  .market-cards { grid-template-columns: 1fr; }
}

/* === Beyond Work === */
.beyond-grid {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 14px;
}
.beyond-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 18px; border-radius: 8px;
  background: var(--card-bg); border: 1px solid var(--card-border);
  font-size: 0.88rem; color: var(--text-secondary);
  transition: all var(--transition);
}
.beyond-item:hover { border-color: var(--accent); color: var(--accent); }
.beyond-item i { color: var(--accent); font-size: 0.95rem; }

/* === Contact === */
.contact-desc {
  text-align: center; color: var(--text-secondary);
  max-width: 500px; margin: -20px auto 36px;
}

.contact-links {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
}
.contact-item {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 28px; border-radius: var(--radius);
  background: var(--card-bg); border: 1px solid var(--card-border);
  color: var(--text); font-size: 0.92rem;
  transition: all var(--transition); min-width: 320px; justify-content: center;
}
.contact-item:hover {
  border-color: var(--accent); color: var(--accent);
  transform: translateY(-2px);
}
.contact-item i { font-size: 1.1rem; color: var(--accent); }

/* === Footer === */
.footer {
  text-align: center; padding: 24px;
  color: var(--text-secondary); font-size: 0.8rem;
  border-top: 1px solid var(--card-border);
}

/* === Chat Widget === */
.chat-widget { position: fixed; bottom: 24px; right: 24px; z-index: 200; }

.chat-toggle {
  width: auto; height: auto; border-radius: 28px;
  background: var(--accent); color: #fff; border: none;
  font-size: 0.92rem; cursor: pointer;
  box-shadow: 0 4px 20px rgba(28, 37, 65, 0.4);
  transition: all var(--transition);
  position: relative;
  padding: 14px 22px;
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font); font-weight: 600;
  letter-spacing: 0.3px;
  animation: chatPulse 3s ease-in-out infinite;
  animation-delay: 2s;
}
.chat-toggle:hover {
  transform: scale(1.05); background: var(--accent-light);
  animation: none;
}
@keyframes chatPulse {
  0%, 100% { box-shadow: 0 4px 20px rgba(28, 37, 65, 0.4); }
  50% { box-shadow: 0 4px 28px rgba(28, 37, 65, 0.6), 0 0 0 6px rgba(28, 37, 65, 0.1); }
}

.chat-toggle-text {
  display: inline;
}

.chat-badge {
  display: none;
}
.chat-badge::after {
  content: ''; position: absolute; top: 100%; right: 18px;
  border: 6px solid transparent; border-top-color: var(--card-bg);
}

.chat-panel {
  position: absolute; bottom: 66px; right: 0;
  width: 380px; max-height: 520px;
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius-lg); box-shadow: 0 8px 32px rgba(0,0,0,0.12);
  display: none; flex-direction: column; overflow: hidden;
}
.chat-panel.active { display: flex; }

.chat-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; border-bottom: 1px solid var(--card-border);
  background: var(--accent); color: #fff;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.chat-header-info { display: flex; align-items: center; gap: 10px; }
.chat-header-info p { font-size: 0.76rem; opacity: 0.85; margin: 0; color: rgba(255,255,255,0.85); }
.chat-header-info strong { color: #fff; }

.chat-avatar {
  width: 34px; height: 34px; border-radius: 8px;
  background: rgba(255,255,255,0.2); display: flex;
  align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.82rem;
}

.chat-close {
  background: none; border: none; color: rgba(255,255,255,0.8);
  cursor: pointer; font-size: 1rem; padding: 4px;
}
.chat-close:hover { color: #fff; }

.chat-messages {
  flex: 1; overflow-y: auto; padding: 16px;
  display: flex; flex-direction: column; gap: 12px;
  max-height: 360px; min-height: 200px;
}

.chat-message {
  max-width: 85%; padding: 10px 14px; border-radius: 10px;
  font-size: 0.86rem; line-height: 1.6;
}
.chat-message.bot {
  background: var(--accent-bg); color: var(--text);
  align-self: flex-start; border-bottom-left-radius: 4px;
}
.chat-message.user {
  background: var(--accent); color: #fff;
  align-self: flex-end; border-bottom-right-radius: 4px;
}
.chat-message.suggestions { background: none; padding: 0; }
.chat-message p { margin: 0; }

.chat-suggestions { display: flex; flex-wrap: wrap; gap: 6px; }
.chat-suggestion-btn {
  background: var(--card-bg); color: var(--accent);
  border: 1px solid var(--accent); border-radius: 8px;
  padding: 6px 12px; font-size: 0.78rem; cursor: pointer;
  transition: all 0.2s ease; line-height: 1.4; font-family: var(--font);
}
.chat-suggestion-btn:hover { background: var(--accent); color: #fff; }

.chat-message.bot.typing::after {
  content: ''; display: inline-block;
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--accent); margin-left: 4px;
  animation: typingDot 1s infinite;
}
@keyframes typingDot {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

.chat-input-wrap { display: flex; padding: 12px; gap: 8px; border-top: 1px solid var(--card-border); }
.chat-input-wrap input {
  flex: 1; padding: 10px 14px; border-radius: 8px;
  border: 1px solid var(--card-border); background: var(--bg);
  color: var(--text); font-size: 0.86rem; outline: none;
  font-family: var(--font); transition: border var(--transition);
}
.chat-input-wrap input:focus { border-color: var(--accent); }
.chat-input-wrap button {
  width: 38px; height: 38px; border-radius: 8px;
  background: var(--accent); color: #fff; border: none;
  cursor: pointer; font-size: 0.85rem;
  transition: background var(--transition);
}
.chat-input-wrap button:hover { background: var(--accent-light); }
.chat-input-wrap button:disabled { opacity: 0.5; cursor: not-allowed; }

@media (max-width: 480px) {
  .chat-panel { width: calc(100vw - 32px); right: -8px; }
  .chat-toggle { padding: 12px 16px; font-size: 0.82rem; }
}

/* === Animations === */
.fade-in {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }