/* ═══════════════════════════════════════════════════════════════════════════
  David 大卫 — Portfolio Stylesheet v3
  Glassmorphism · Better Hero · Enhanced Mobile · Premium Hovers
  ═══════════════════════════════════════════════════════════════════════════ */

/* ─── Variables ─────────────────────────────────────────────────────────── */
:root,
[data-theme="light"] {
  --primary: #1a3c6e;
  --accent: #2e74b5;
  --accent-light: #4a9eed;
  --gradient-start: #1a3c6e;
  --gradient-end: #2e74b5;
  --gradient-cool: #4ecdc4;
  --bg: #fcfdff;
  --bg-alt: #f7faff;
  --text: #23313f;
  --text-light: #6d7a86;
  --card-bg: rgba(255, 255, 255, 0.94);
  --card-border: rgba(26, 60, 110, 0.08);
  --card-shadow: 0 8px 28px rgba(19, 45, 79, 0.08);
  --card-hover: 0 14px 42px rgba(46, 116, 181, 0.16);
  --nav-bg: rgba(255, 255, 255, 0.88);
  --radius: 16px;
  --transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --primary: #6db3f8;
  --accent: #4a9eed;
  --accent-light: #82c4ff;
  --gradient-start: #0d1117;
  --gradient-end: #1a3c6e;
  --gradient-cool: #2fbfb3;
  --bg: #0d1117;
  --bg-alt: #161b22;
  --text: #e6edf3;
  --text-light: #8b949e;
  --card-bg: rgba(22, 27, 34, 0.85);
  --card-border: rgba(255, 255, 255, 0.1);
  --card-shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
  --card-hover: 0 12px 40px rgba(74, 158, 237, 0.25);
  --nav-bg: rgba(13, 17, 23, 0.95);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
  transition: background 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

/* ─── Particles Canvas ─────────────────────────────────────────────────── */
#particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ─── Navigation ────────────────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
  transition: var(--transition);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.nav-logo span {
  color: var(--accent);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  order: 3;
}

.header-socials {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-right: 0.45rem;
}

.header-social {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  color: var(--primary);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.05);
  transition: var(--transition);
}

.header-social:hover {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.header-social-static {
  cursor: default;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--primary);
}

.theme-toggle {
  background: none;
  border: 2px solid var(--card-border);
  border-radius: 50px;
  width: 42px;
  height: 42px;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  border-color: var(--accent);
  background: rgba(46, 116, 181, 0.08);
  transform: rotate(15deg);
}

.theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="dark"] .theme-icon-dark { display: inline; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.1rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-light);
  font-weight: 500;
  font-size: 0.88rem;
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: rgba(46, 116, 181, 0.08);
}

/* ─── Hero ──────────────────────────────────────────────────────────────── */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(135deg, #0f1923 0%, #1a3c6e 30%, #2e74b5 55%, #4ecdc4 80%, #44bd8e 100%);
}

[data-theme="dark"] #hero {
  background: linear-gradient(135deg, #0d1117 0%, #1a2a4a 30%, #2e74b5 55%, #4ecdc4 80%, #2fbfb3 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  color: #fff;
  padding: 2rem;
}

.hero-photo {
  width: 160px;
  height: 160px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  overflow: hidden;
  border: 6px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  animation: float 6s ease-in-out infinite;
  transition: transform 0.4s ease;
}

.hero-photo:hover {
  transform: scale(1.05);
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 6%;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero-greeting {
  font-size: 1.1rem;
  font-weight: 400;
  opacity: 0.85;
  margin-bottom: 0.4rem;
  letter-spacing: 3px;
  text-transform: uppercase;
}

.hero-name {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 1rem;
  letter-spacing: -1px;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
}

.hero-name .chinese {
  opacity: 0.85;
  font-weight: 700;
}

.hero-tagline {
  font-size: 1.25rem;
  font-weight: 400;
  opacity: 0.95;
  margin-bottom: 0.3rem;
  min-height: 1.6em;
}

.typed-cursor {
  animation: blink 0.8s step-end infinite;
  font-weight: 300;
  opacity: 0.8;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero-tagline-cn {
  font-size: 1rem;
  opacity: 0.65;
  margin-bottom: 2.2rem;
}

.hero-cta {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.8rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: #fff;
  color: var(--gradient-start);
}

.btn-primary:hover {
  background: rgba(255, 255, 255, 0.92);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.btn-outline {
  border: 2px solid rgba(255, 255, 255, 0.6);
  color: #fff;
  background: transparent;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
  transform: translateY(-3px);
}

.btn-download {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(8px);
}

.btn-download:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.6);
  transform: translateY(-3px);
}

/* Scroll indicator mouse */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

.mouse {
  width: 26px;
  height: 40px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 14px;
  position: relative;
}

.mouse-wheel {
  width: 4px;
  height: 8px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 2px;
  position: absolute;
  top: 7px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll-wheel 2s ease-in-out infinite;
}

@keyframes scroll-wheel {
  0% { opacity: 1; top: 7px; }
  100% { opacity: 0; top: 22px; }
}

/* ─── Sections ─────────────────────────────────────────────────────────── */
.section {
  padding: 5rem 0;
  position: relative;
  z-index: 1;
  background: var(--bg);
  transition: background 0.4s ease;
}

.section-alt {
  background: var(--bg-alt);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 2.5rem;
  text-align: center;
  letter-spacing: -0.5px;
}

.section-title .cn {
  font-size: 1rem;
  color: var(--text-light);
  font-weight: 400;
  display: block;
  margin-top: 0.3rem;
}

/* ─── About ────────────────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-text p {
  margin-bottom: 1rem;
  font-size: 1.05rem;
  color: var(--text);
}

.about-intro {
  font-family: 'Cormorant Garamond', 'Noto Sans SC', serif;
  font-size: clamp(1.55rem, 2.6vw, 2.1rem) !important;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--primary) !important;
  max-width: 20ch;
}

.about-cn {
  color: var(--text-light) !important;
  font-size: 0.95rem !important;
}

.about-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.fact-card {
  background: linear-gradient(135deg, var(--gradient-start), var(--accent));
  color: #fff;
  padding: 1.5rem;
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
}

.fact-card:hover {
  transform: translateY(-5px) scale(1.02);
  box-shadow: 0 12px 35px rgba(46, 116, 181, 0.3);
}

.fact-number {
  display: block;
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 0.3rem;
}

.fact-label {
  font-size: 0.78rem;
  opacity: 0.9;
  line-height: 1.4;
}

/* ─── Skills ───────────────────────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.skill-card {
  background: var(--card-bg);
  padding: 1.8rem;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.skill-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
}

.skill-icon {
  font-size: 2rem;
  margin-bottom: 0.8rem;
}

.skill-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.8rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.skill-tags span {
  background: linear-gradient(135deg, rgba(46, 116, 181, 0.1), rgba(78, 205, 196, 0.1));
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.3rem 0.7rem;
  border-radius: 20px;
  border: 1px solid rgba(46, 116, 181, 0.15);
  transition: var(--transition);
}

.skill-tags span:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.05);
}

/* ─── Timeline (Experience) ────────────────────────────────────────────── */
.timeline {
  position: relative;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--accent), var(--gradient-cool));
  border-radius: 3px;
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2.85rem;
  top: 0.3rem;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border: 3px solid var(--bg);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--accent);
  transition: var(--transition);
}

.timeline-content {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--card-border);
  transition: var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.timeline-content:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.3rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-header h3 {
  font-size: 1.05rem;
  color: var(--primary);
}

.timeline-date {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(46, 116, 181, 0.1);
  padding: 0.2rem 0.8rem;
  border-radius: 20px;
  white-space: nowrap;
}

.timeline-subtitle {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 0.8rem;
}

.timeline-content ul {
  list-style: none;
  padding: 0;
}

.timeline-content li {
  position: relative;
  padding-left: 1.2rem;
  margin-bottom: 0.4rem;
  font-size: 0.92rem;
  color: var(--text);
}

.timeline-content li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

.timeline-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.timeline-content a:hover {
  color: var(--accent-light);
}

/* ─── Projects ─────────────────────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.project-featured {
  padding: 2rem;
  min-height: 280px;
}

.project-featured:first-child {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(255, 138, 87, 0.14), rgba(120, 176, 166, 0.12));
}

.project-featured h3 {
  font-size: 1.35rem;
}

.project-featured > p:last-child {
  font-size: 0.98rem;
}

.project-card {
  background: var(--card-bg);
  padding: 1.8rem;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--card-border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--gradient-cool));
  transition: height 0.3s ease;
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
}

.project-card:hover::before {
  height: 6px;
}

.project-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(46, 116, 181, 0.1), rgba(78, 205, 196, 0.1));
  color: var(--accent);
  margin-bottom: 0.8rem;
}

.project-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.3rem;
}

.project-cn {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 0.6rem;
}

.project-card > p:last-child {
  font-size: 0.92rem;
  color: var(--text);
}

.project-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.9rem;
  font-size: 0.85rem;
}

.project-links a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.project-links a:hover {
  color: var(--accent-light);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ─── CVs ──────────────────────────────────────────────────────────────── */
.cv-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.cv-card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--card-border);
  transition: var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.cv-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
}

.cv-card-primary {
  background: linear-gradient(135deg, rgba(46, 116, 181, 0.14), rgba(78, 205, 196, 0.1));
}

.cv-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(46, 116, 181, 0.1), rgba(78, 205, 196, 0.1));
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.cv-card h3 {
  font-size: 1.2rem;
  color: var(--primary);
  margin-bottom: 0.3rem;
}

.cv-cn {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 0.8rem;
}

.cv-card > p {
  color: var(--text);
}

.cv-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1rem;
}

.cv-tags span {
  background: linear-gradient(135deg, rgba(46, 116, 181, 0.1), rgba(78, 205, 196, 0.1));
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(46, 116, 181, 0.15);
}

.cv-links {
  display: flex;
  gap: 0.9rem;
  margin-top: 1.2rem;
}

.cv-links a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.cv-links a:hover {
  color: var(--accent-light);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ─── Education ────────────────────────────────────────────────────────── */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.edu-card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--card-border);
  transition: var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.edu-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
}

.edu-highlight {
  border-left: 4px solid var(--accent);
}

.edu-year {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(46, 116, 181, 0.1);
  padding: 0.2rem 0.7rem;
  border-radius: 20px;
  margin-bottom: 0.6rem;
}

.edu-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.2rem;
}

.gpa {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--gradient-cool);
}

.edu-cn {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 0.4rem;
}

.edu-school {
  font-size: 0.9rem;
  color: var(--text);
}

/* ─── Certifications ───────────────────────────────────────────────────── */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin-bottom: 2.5rem;
}

.cert-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: var(--card-bg);
  padding: 1.2rem;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--card-border);
  transition: var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.cert-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
}

.cert-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.cert-item strong {
  display: block;
  font-size: 0.92rem;
  color: var(--primary);
  margin-bottom: 0.2rem;
}

.cert-item p {
  font-size: 0.82rem;
  color: var(--text-light);
  margin: 0;
}

.cert-sub-title {
  text-align: center;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1.5rem;
}

.cert-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
}

.cert-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.cert-badge:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(46, 116, 181, 0.25);
}

.cert-badge-icon {
  font-size: 1rem;
}

/* ─── Awards ───────────────────────────────────────────────────────────── */
.awards-list {
  max-width: 700px;
  margin: 0 auto;
}

.award-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: var(--card-bg);
  padding: 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.award-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
}

.award-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.award-item strong {
  display: block;
  font-size: 0.95rem;
  color: var(--primary);
}

.award-item p {
  font-size: 0.85rem;
  color: var(--text-light);
  margin: 0;
}

/* ─── Contact ──────────────────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.contact-card {
  text-align: center;
  background: var(--card-bg);
  padding: 2rem 1rem;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--card-border);
  text-decoration: none;
  color: var(--text);
  transition: var(--transition);
  display: block;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
}

.contact-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.8rem;
}

.contact-card strong {
  display: block;
  font-size: 0.95rem;
  color: var(--primary);
  margin-bottom: 0.3rem;
}

.contact-card p {
  font-size: 0.82rem;
  color: var(--text-light);
  margin: 0;
  word-break: break-word;
}

/* ─── Footer ───────────────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 2rem;
  background: var(--gradient-start);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.85rem;
  position: relative;
  z-index: 1;
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 52px;
  height: 52px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  cursor: pointer;
  box-shadow: 0 8px 25px rgba(46, 116, 181, 0.3);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 2000;
}

.back-to-top:hover {
  transform: scale(1.1);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

/* ─── Animations ───────────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* stagger children */
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }
.reveal-delay-6 { transition-delay: 0.6s; }

/* ─── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }

  .nav-links.open {
    display: flex;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: 1fr 1fr;
  }

  .projects-grid,
  .cv-grid,
  .edu-grid {
    grid-template-columns: 1fr;
  }

  .cert-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }

  .back-to-top {
    right: 1rem;
    bottom: 1rem;
  }

  .timeline-header {
    flex-direction: column;
  }

  .section {
    padding: 3.5rem 0;
  }

  .hero-photo {
    width: 120px;
    height: 120px;
  }
}

@media (max-width: 480px) {
  .skills-grid,
  .about-facts,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .hero-name {
    font-size: 2.5rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
}

/* ─── Visual Direction Overrides ───────────────────────────────────────── */
:root,
[data-theme="light"] {
  --primary: #1d3255;
  --accent: #d05c2d;
  --accent-light: #f0895a;
  --gradient-start: #f3eee6;
  --gradient-end: #d9e3ef;
  --gradient-cool: #5f8b78;
  --bg: #fbf7f1;
  --bg-alt: #f1ece4;
  --text: #1f2833;
  --text-light: #645f59;
  --card-bg: rgba(255, 252, 247, 0.82);
  --card-border: rgba(29, 50, 85, 0.12);
  --card-shadow: 0 20px 45px rgba(70, 47, 28, 0.08);
  --card-hover: 0 24px 55px rgba(208, 92, 45, 0.18);
  --nav-bg: rgba(251, 247, 241, 0.76);
}

[data-theme="dark"] {
  --primary: #f4ede2;
  --accent: #ff8a57;
  --accent-light: #ffb08f;
  --gradient-start: #08131d;
  --gradient-end: #10293d;
  --gradient-cool: #78b0a6;
  --bg: #081018;
  --bg-alt: #0d1721;
  --text: #e9e2d7;
  --text-light: #9ea7ab;
  --card-bg: rgba(14, 26, 36, 0.72);
  --card-border: rgba(255, 255, 255, 0.1);
  --card-shadow: 0 22px 50px rgba(0, 0, 0, 0.4);
  --card-hover: 0 28px 60px rgba(255, 138, 87, 0.16);
  --nav-bg: rgba(8, 16, 24, 0.72);
}

body {
  font-family: 'Space Grotesk', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at top left, rgba(255, 138, 87, 0.1), transparent 28%),
    radial-gradient(circle at 84% 16%, rgba(120, 176, 166, 0.1), transparent 24%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 24%);
  pointer-events: none;
  z-index: 0;
}

#navbar {
  border-bottom: 1px solid var(--card-border);
  box-shadow: 0 18px 35px rgba(0, 0, 0, 0.12);
}

.nav-logo {
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.nav-links a {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

#hero {
  padding: 7rem 0 4rem;
  text-align: left;
  background: linear-gradient(140deg, #081018 0%, #10293d 38%, #17354c 68%, #224f59 100%);
}

[data-theme="light"] #hero {
  background: linear-gradient(140deg, #f3eee6 0%, #e6dfd4 30%, #dce7ef 62%, #dfeae0 100%);
}

.hero-content.hero-grid {
  width: min(1180px, calc(100% - 4rem));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 390px);
  gap: 2.2rem;
  align-items: end;
  padding: 0;
}

#hero > .hero-content:not(.hero-grid) {
  width: min(760px, calc(100% - 2rem));
  margin: 0 auto;
  text-align: center;
  padding: 2rem 1.4rem 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 32px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.hero-main {
  position: relative;
  z-index: 1;
}

.hero-glow {
  position: absolute;
  border-radius: 999px;
  filter: blur(26px);
  opacity: 0.7;
}

.hero-glow-left {
  width: 260px;
  height: 260px;
  top: 18%;
  left: 6%;
  background: rgba(255, 138, 87, 0.18);
}

.hero-glow-right {
  width: 320px;
  height: 320px;
  right: 8%;
  bottom: 15%;
  background: rgba(120, 176, 166, 0.18);
}

.hero-kicker {
  margin-bottom: 0.9rem;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-light);
}

.hero-greeting {
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  margin-bottom: 1rem;
  color: rgba(255, 255, 255, 0.72);
}

[data-theme="light"] .hero-greeting {
  color: rgba(31, 40, 51, 0.6);
}

.hero-name,
.section-title {
  font-family: 'Cormorant Garamond', 'Noto Sans SC', serif;
  letter-spacing: -0.03em;
}

.hero-name {
  font-size: clamp(4rem, 8vw, 6.8rem);
  font-weight: 600;
  line-height: 0.95;
  margin-bottom: 0.8rem;
}

.hero-name .chinese {
  font-weight: 500;
  opacity: 0.78;
}

.hero-tagline {
  font-size: 1.3rem;
  margin-bottom: 0.9rem;
}

.hero-lead {
  max-width: 43rem;
  margin: 0 auto 1rem;
  font-size: 1.02rem;
  color: rgba(255, 255, 255, 0.78);
}

[data-theme="light"] .hero-lead {
  color: rgba(31, 40, 51, 0.72);
}

.hero-tagline-cn {
  margin-bottom: 2rem;
  max-width: 44rem;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  justify-content: center;
  margin-bottom: 1.8rem;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin: 0 auto 1rem;
  max-width: 42rem;
}

.hero-metric {
  padding: 0.95rem 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0));
}

[data-theme="light"] .hero-metric {
  border-top-color: rgba(29, 50, 85, 0.18);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.34), rgba(255, 255, 255, 0));
}

.hero-metric-label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent-light);
}

.hero-metric strong {
  font-size: 0.96rem;
}

.hero-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  max-width: 46rem;
}

#hero > .hero-content:not(.hero-grid) .hero-photo {
  margin: 0 auto 1.4rem;
  transform: none;
  width: 180px;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
}

#hero > .hero-content:not(.hero-grid) .hero-photo:hover {
  transform: scale(1.03);
}

.hero-strip-item {
  padding: 1rem 1.05rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0));
}

[data-theme="light"] .hero-strip-item {
  border-top-color: rgba(29, 50, 85, 0.16);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.34), rgba(255, 255, 255, 0));
}

.hero-strip-label {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent-light);
}

.hero-side {
  position: relative;
  z-index: 1;
}

.hero-photo-wrap,
.hero-note {
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, rgba(11, 21, 31, 0.78), rgba(11, 21, 31, 0.54));
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

[data-theme="light"] .hero-photo-wrap,
[data-theme="light"] .hero-note {
  background: linear-gradient(180deg, rgba(255, 253, 249, 0.92), rgba(245, 240, 232, 0.84));
  border-color: rgba(29, 50, 85, 0.1);
}

.hero-photo-wrap {
  padding: 1rem;
  margin-bottom: 1rem;
}

.hero-photo {
  width: min(100%, 300px);
  height: auto;
  aspect-ratio: 1 / 1.06;
  margin: 0 auto;
  border-radius: 28px;
  transform: rotate(2deg);
  animation: none;
}

.hero-photo:hover {
  transform: rotate(0deg) scale(1.02);
}

.hero-note {
  padding: 1.2rem 1.25rem;
}

.hero-note-title {
  margin-bottom: 0.75rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-light);
}

.hero-note-list {
  list-style: none;
  margin-bottom: 1rem;
}

.hero-note-list li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.65rem;
}

.hero-note-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.hero-note-footer {
  padding-top: 0.9rem;
  border-top: 1px solid var(--card-border);
  color: var(--text-light);
  font-size: 0.84rem;
}

.btn {
  padding: 0.85rem 1.45rem;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-light);
  box-shadow: 0 18px 30px rgba(208, 92, 45, 0.25);
}

.btn-outline {
  border: 1px solid rgba(255, 255, 255, 0.34);
  background: rgba(255, 255, 255, 0.04);
}

.btn-download {
  border: 1px solid rgba(255, 255, 255, 0.24);
}

[data-theme="light"] .btn-outline,
[data-theme="light"] .btn-download {
  color: #1b2430;
  border-color: rgba(29, 50, 85, 0.18);
  background: rgba(255, 255, 255, 0.4);
}

.section-alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)), var(--bg-alt);
}

.section-title {
  font-size: clamp(2.6rem, 4.4vw, 3.4rem);
  font-weight: 600;
}

.fact-card {
  background: linear-gradient(160deg, rgba(255, 138, 87, 0.16), rgba(120, 176, 166, 0.12));
  color: var(--text);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
}

.fact-number {
  color: var(--accent);
  font-size: 2rem;
}

.skill-card:hover,
.project-card:hover,
.edu-card:hover,
.cert-item:hover,
.award-item:hover,
.contact-card:hover,
.timeline-content:hover {
  border-color: rgba(255, 138, 87, 0.24);
}

.skill-tags span,
.project-badge {
  background: linear-gradient(135deg, rgba(255, 138, 87, 0.12), rgba(120, 176, 166, 0.12));
}

.timeline-date,
.edu-year {
  background: rgba(255, 138, 87, 0.12);
}

.project-card:nth-child(3n + 2) {
  background: linear-gradient(180deg, rgba(255, 138, 87, 0.08), var(--card-bg));
}

.project-card:nth-child(3n + 3) {
  background: linear-gradient(180deg, rgba(120, 176, 166, 0.08), var(--card-bg));
}

.back-to-top {
  background: linear-gradient(135deg, var(--accent), var(--gradient-cool));
}

@media (max-width: 768px) {
  .header-socials {
    gap: 0.35rem;
    margin-right: 0.25rem;
  }

  .header-social {
    width: 30px;
    height: 30px;
    font-size: 0.74rem;
  }

  .hero-content.hero-grid {
    width: min(100% - 2rem, 1180px);
    grid-template-columns: 1fr;
    gap: 1.6rem;
  }
  
  .hero-metrics {
    grid-template-columns: 1fr;
  }
  
  .project-featured:first-child {
    grid-column: auto;
  }

  .hero-main {
    text-align: center;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-strip {
    grid-template-columns: 1fr;
    max-width: none;
  }

  .hero-photo {
    width: min(100%, 260px);
  }

  #hero > .hero-content:not(.hero-grid) .hero-photo {
    width: 150px;
  }
}

@media (max-width: 480px) {
  .header-socials {
    display: none;
  }

  .hero-name {
    font-size: 3.4rem;
  }
}

/* ═══ ELEVATED DESIGN LAYER ═══════════════════════════════════════════════ */

/* ── Grain texture overlay ────────────────────────────────────────────── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.028;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px;
}

/* ── Animated gradient hero name ──────────────────────────────────────── */
.hero-name {
  background: linear-gradient(
    135deg,
    #fff 0%,
    #ff8a57 25%,
    #78b0a6 50%,
    #f0895a 75%,
    #fff 100%
  );
  background-size: 300% 300%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 8s ease-in-out infinite;
}

[data-theme="light"] .hero-name {
  background: linear-gradient(
    135deg,
    #1d3255 0%,
    #d05c2d 25%,
    #5f8b78 50%,
    #d05c2d 75%,
    #1d3255 100%
  );
  background-size: 300% 300%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 8s ease-in-out infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* ── Custom scrollbar ─────────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent), var(--gradient-cool));
  border-radius: 99px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

html {
  scrollbar-width: thin;
  scrollbar-color: var(--accent) var(--bg);
}

/* ── Glow hover for interactive cards ─────────────────────────────────── */
.skill-card,
.project-card,
.edu-card,
.cert-item,
.award-item,
.contact-card,
.timeline-content {
  position: relative;
  overflow: hidden;
}

.skill-card::after,
.project-card::after,
.edu-card::after,
.timeline-content::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.5s ease;
  background: radial-gradient(
    600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
    rgba(255, 138, 87, 0.08),
    transparent 40%
  );
  pointer-events: none;
}

.skill-card:hover::after,
.project-card:hover::after,
.edu-card:hover::after,
.timeline-content:hover::after {
  opacity: 1;
}

/* ── 3D tilt perspective on project cards ─────────────────────────────── */
.projects-grid {
  perspective: 1200px;
}

.project-card {
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Section number labels ────────────────────────────────────────────── */
.section-title {
  position: relative;
}

.section-number {
  display: block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.6;
  margin-bottom: 0.4rem;
}

/* ── Tech marquee strip ───────────────────────────────────────────────── */
.tech-marquee {
  overflow: hidden;
  padding: 1.2rem 0;
  margin-top: 2rem;
  border-top: 1px solid var(--card-border);
  border-bottom: 1px solid var(--card-border);
  position: relative;
}

.tech-marquee::before,
.tech-marquee::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 80px;
  z-index: 2;
  pointer-events: none;
}

.tech-marquee::before {
  left: 0;
  background: linear-gradient(90deg, var(--bg-alt), transparent);
}

.tech-marquee::after {
  right: 0;
  background: linear-gradient(270deg, var(--bg-alt), transparent);
}

.marquee-track {
  display: flex;
  gap: 2.5rem;
  animation: marquee 30s linear infinite;
  width: max-content;
}

.marquee-track span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-light);
  white-space: nowrap;
  letter-spacing: 0.04em;
  transition: color 0.3s ease;
}

.marquee-track span:hover {
  color: var(--accent);
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ── Counter number animation ─────────────────────────────────────────── */
.fact-number {
  font-variant-numeric: tabular-nums;
}

/* ── Stagger reveal with scale ────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(50px) scale(0.97);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.stagger-1 { transition-delay: 0.05s; }
.stagger-2 { transition-delay: 0.10s; }
.stagger-3 { transition-delay: 0.15s; }
.stagger-4 { transition-delay: 0.20s; }
.stagger-5 { transition-delay: 0.25s; }
.stagger-6 { transition-delay: 0.30s; }
.stagger-7 { transition-delay: 0.35s; }
.stagger-8 { transition-delay: 0.40s; }
.stagger-9 { transition-delay: 0.45s; }
.stagger-10 { transition-delay: 0.50s; }
.stagger-11 { transition-delay: 0.55s; }

/* ── Enhanced footer ──────────────────────────────────────────────────── */
footer {
  background: linear-gradient(180deg, var(--bg), var(--bg-alt));
  color: var(--text);
  padding: 4rem 2rem 2rem;
  text-align: center;
  border-top: 1px solid var(--card-border);
}

.footer-inner {
  max-width: 600px;
  margin: 0 auto;
}

.footer-brand {
  font-family: 'Cormorant Garamond', serif;
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--accent), var(--gradient-cool));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-tagline {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-bottom: 1.6rem;
}

.footer-socials {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  margin-bottom: 2rem;
}

.footer-socials a {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--card-border);
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 700;
  transition: var(--transition);
}

.footer-socials a:hover {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(208, 92, 45, 0.25);
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--text-light);
  opacity: 0.6;
}

/* ── Smooth section fade separators ───────────────────────────────────── */
.section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--card-border), transparent);
}

/* ── Enhanced project featured glow ───────────────────────────────────── */
.project-featured {
  border: 1px solid rgba(255, 138, 87, 0.2);
  box-shadow: 0 0 0 1px rgba(255, 138, 87, 0.04),
              0 24px 55px rgba(208, 92, 45, 0.12);
}

.project-featured:hover {
  box-shadow: 0 0 30px rgba(255, 138, 87, 0.15),
              0 28px 60px rgba(208, 92, 45, 0.18);
}

/* ── Award items spacing fix ──────────────────────────────────────────── */
.awards-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ── Animated accent bar on nav ───────────────────────────────────────── */
.nav-links a {
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease, left 0.3s ease;
  border-radius: 99px;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 60%;
  left: 20%;
}

/* ── Hero CTA button glow ─────────────────────────────────────────────── */
.btn-primary {
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: linear-gradient(135deg, var(--accent), var(--gradient-cool), var(--accent));
  background-size: 200% 200%;
  border-radius: inherit;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.4s ease;
  animation: gradientShift 4s ease-in-out infinite;
}

.btn-primary:hover::before {
  opacity: 1;
}

/* ── Hero scroll indicator pulse ──────────────────────────────────────── */
.scroll-indicator {
  animation: fadeInUp 1.5s ease 2s both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}