/* ===== CSS VARIABLES & RESET ===== */
:root {
  --bg-deep: #050d1a;
  --bg-mid: #071525;
  --bg-card: rgba(10, 25, 50, 0.85);
  --accent: #3b8bff;
  --accent-glow: #5ba3ff;
  --accent2: #f0c040;
  --accent3: #40e0ff;
  --text-primary: #e8f0ff;
  --text-secondary: #8fadd6;
  --text-muted: #4a6a9a;
  --border: rgba(60, 139, 255, 0.2);
  --border-bright: rgba(60, 139, 255, 0.5);
  --tower-color: #60a0e0;
  --wire-color: #2a5080;
  --glow-blue: 0 0 20px rgba(59, 139, 255, 0.4);
  --glow-gold: 0 0 20px rgba(240, 192, 64, 0.4);
  --font-main: 'Outfit', 'Noto Sans SC', sans-serif;
  --radius: 16px;
  --transition: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

body {
  font-family: var(--font-main);
  background: var(--bg-deep);
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.7;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ===== CANVAS BACKGROUND ===== */
#bgCanvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  height: 70px;
  background: rgba(5, 13, 26, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s ease;
}

.navbar.scrolled {
  height: 60px;
  background: rgba(5, 13, 26, 0.97);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
  border-radius: 2px;
}

.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== HERO SECTION ===== */
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(59, 139, 255, 0.1);
  border: 1px solid var(--border-bright);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  margin-left: 1rem;
}

.lang-btn:hover {
  background: rgba(59, 139, 255, 0.2);
  color: #fff;
  border-color: var(--accent);
}

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  z-index: 1;
}

/* ===== POWER GRID SCENE ===== */
.grid-scene {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 55%;
  z-index: 1;
  overflow: hidden;
}

#powerLineSvg {
  position: absolute;
  bottom: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 1;
}

.tower-container {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 100%;
  z-index: 2;
}

.tower-el {
  position: absolute;
  bottom: 0;
  transform-origin: bottom center;
  cursor: pointer;
  transition: filter 0.3s ease, transform 0.3s ease;
}

.tower-el:hover {
  filter: drop-shadow(0 0 12px var(--accent-glow));
  transform: scaleY(1.03);
}

.tower-el svg {
  display: block;
  filter: drop-shadow(0 0 4px rgba(96, 160, 224, 0.3));
}

/* ===== HERO CONTENT ===== */
.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 80px 20px 280px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(59, 139, 255, 0.15);
  border: 1px solid var(--border-bright);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
  animation: fadeInDown 0.6s ease both;
}

.hero-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  margin-bottom: 1rem;
  animation: fadeInDown 0.7s ease 0.1s both;
}

.name-cn {
  font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 900;
  letter-spacing: 0.2em;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-glow) 50%, var(--accent3) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.05;
  text-shadow: none;
}

.name-en {
  font-size: clamp(1rem, 2.5vw, 1.6rem);
  font-weight: 300;
  letter-spacing: 0.5em;
  color: var(--text-secondary);
}

/* Language-specific Hierarchies */
.lang-en .name-en {
  font-size: clamp(2.5rem, 8vw, 5.5rem);
  font-weight: 900;
  letter-spacing: 0.05em;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-glow) 50%, var(--accent3) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.lang-en .name-cn {
  font-size: clamp(1rem, 3vw, 1.8rem);
  font-weight: 400;
  letter-spacing: 0.3em;
  background: none;
  -webkit-text-fill-color: var(--text-secondary);
  color: var(--text-secondary);
  order: 2; /* Move it below the English name if needed */
}

.lang-zh .name-cn {
  order: 1;
}

.lang-zh .name-en {
  order: 2;
}

.hero-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  margin-bottom: 1rem;
  animation: fadeInDown 0.7s ease 0.1s both;
}

.hero-subtitle {
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--text-secondary);
  letter-spacing: 0.15em;
  margin-bottom: 2.5rem;
  animation: fadeInDown 0.8s ease 0.2s both;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2.5rem;
  animation: fadeInDown 0.9s ease 0.3s both;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-num {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-top: 4px;
}

.stat-div {
  width: 1px;
  height: 40px;
  background: var(--border);
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInDown 1s ease 0.4s both;
}

.btn-primary, .btn-secondary {
  padding: 12px 32px;
  border-radius: 100px;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent3) 100%);
  color: white;
  box-shadow: 0 4px 20px rgba(59, 139, 255, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 139, 255, 0.6);
}

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

.btn-secondary:hover {
  background: rgba(59, 139, 255, 0.1);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ===== SCROLL HINT ===== */
.scroll-hint {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  animation: fadeIn 2s ease 1.5s both;
}

.scroll-arrow {
  width: 20px;
  height: 30px;
  border: 1px solid var(--text-muted);
  border-radius: 10px;
  position: relative;
}

.scroll-arrow::after {
  content: '';
  position: absolute;
  top: 5px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 2px;
  animation: scrollDot 2s ease infinite;
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5%;
}

/* ===== SECTION COMMON ===== */
section {
  padding: 120px 0;
  position: relative;
  z-index: 1;
}

.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  padding: 4px 14px;
  background: rgba(59, 139, 255, 0.1);
  border: 1px solid var(--border);
  border-radius: 100px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.section-sub {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 4rem;
}

.highlight {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent3) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== ABOUT SECTION ===== */
.about {
  background: linear-gradient(180deg, transparent 0%, rgba(7, 21, 37, 0.8) 50%, transparent 100%);
}

.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 5rem;
  align-items: center;
  margin-top: 3rem;
}

.about-photo {
  display: flex;
  justify-content: center;
}

.photo-frame {
  width: 220px;
  height: 260px;
  position: relative;
}

.photo-inner {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(10,30,70,0.9) 0%, rgba(20,50,110,0.9) 100%);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--glow-blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

.photo-inner svg {
  width: 80%;
  height: 80%;
}

.photo-badge {
  position: absolute;
  bottom: -15px;
  right: -15px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent3) 100%);
  color: white;
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 0.78rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: var(--glow-blue);
}

.about-intro {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.about-quote {
  border-left: 3px solid var(--accent);
  padding-left: 1.2rem;
  font-size: 1.05rem;
  font-style: italic;
  color: var(--accent);
  background: rgba(59, 139, 255, 0.05);
  padding-top: 0.8rem;
  padding-bottom: 0.8rem;
  border-radius: 0 8px 8px 0;
  margin: 1.5rem 0;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 2rem;
}

.tag {
  padding: 5px 14px;
  background: rgba(59, 139, 255, 0.1);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.82rem;
  color: var(--accent);
  transition: all 0.2s ease;
}

.tag:hover {
  background: rgba(59, 139, 255, 0.2);
  border-color: var(--accent);
}

.about-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.about-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.about-link:hover { color: var(--accent); }

/* ===== TIMELINE SECTION ===== */
.timeline-section {
  position: relative;
}

.timeline-grid-scene {
  position: relative;
  width: 100%;
  height: 100px;
  margin-bottom: 3rem;
  overflow: hidden;
  border-radius: var(--radius);
  background: linear-gradient(180deg, transparent 0%, rgba(7, 21, 37, 0.5) 100%);
}

#timelineCanvas {
  width: 100%;
  height: 100%;
}

/* ===== TIMELINE CARDS ===== */
.timeline {
  position: relative;
  padding: 2rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 40px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, transparent 0%, var(--accent) 5%, var(--accent) 95%, transparent 100%);
  transform: translateX(-50%);
}

.timeline-item {
  display: grid;
  grid-template-columns: 80px 1fr !important;
  gap: 1.5rem;
  margin-bottom: 5rem;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  align-items: center;
  direction: ltr !important;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-item > .timeline-marker {
  grid-column: 1;
  grid-row: 1;
}

.timeline-item > .timeline-card {
  grid-column: 2;
  grid-row: 1;
  text-align: left;
}

.timeline-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.tower-icon {
  width: 44px;
  height: 64px;
  color: var(--tower-color);
  filter: drop-shadow(0 0 6px rgba(96, 160, 224, 0.5));
  transition: filter 0.3s ease, color 0.3s ease;
  flex-shrink: 0;
}

.tower-icon:hover {
  color: var(--accent-glow);
  filter: drop-shadow(0 0 12px rgba(91, 163, 255, 0.8));
}

.timeline-year {
  margin-top: 16px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(59, 139, 255, 0.12);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 2px 10px;
  white-space: nowrap;
  z-index: 3;
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.timeline-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent3) 100%);
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 0.5s ease;
}

.timeline-item.visible .timeline-card::before {
  transform: scaleX(1);
}

.timeline-card:hover {
  border-color: var(--border-bright);
  box-shadow: var(--glow-blue);
  transform: translateY(-4px);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
  gap: 1rem;
}

.card-company {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.card-period {
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.card-role {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.8rem;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 0.8rem;
}

.card-tags span {
  padding: 3px 10px;
  background: rgba(59, 139, 255, 0.08);
  border: 1px solid rgba(59, 139, 255, 0.2);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--accent);
}

.card-voltage {
  position: static;
  display: inline-block;
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent2);
  letter-spacing: 0.08em;
  background: rgba(240, 192, 64, 0.1);
  border: 1px solid rgba(240, 192, 64, 0.3);
  border-radius: 6px;
  padding: 2px 8px;
  margin-top: 0.5rem;
}

/* ===== EDUCATION SECTION ===== */
.education {
  background: linear-gradient(180deg, transparent 0%, rgba(7, 21, 37, 0.6) 50%, transparent 100%);
}

.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}

.edu-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.edu-card:hover {
  border-color: var(--border-bright);
  box-shadow: var(--glow-blue);
  transform: translateY(-4px);
}

.edu-icon {
  font-size: 2.5rem;
  flex-shrink: 0;
}

.edu-school {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.edu-degree {
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 4px;
}

.edu-year {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.edu-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ===== SKILLS SECTION ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}

.skill-category.visible {
  opacity: 1;
  transform: translateY(0);
}

.skill-category:hover {
  border-color: var(--border-bright);
  box-shadow: var(--glow-blue);
}

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

.skill-category h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.skill-bars { display: flex; flex-direction: column; gap: 1rem; }

.skill-name {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  display: flex;
  justify-content: space-between;
}

.skill-bar {
  height: 6px;
  background: rgba(59, 139, 255, 0.1);
  border-radius: 3px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent3) 100%);
  border-radius: 3px;
  width: 0;
  transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 0 8px rgba(59, 139, 255, 0.5);
}

/* ===== CONTACT SECTION ===== */
.contact {
  background: linear-gradient(180deg, transparent 0%, rgba(7, 21, 37, 0.8) 100%);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  backdrop-filter: blur(20px);
  transition: all 0.3s var(--transition);
}

.contact-card:hover {
  border-color: var(--accent);
  box-shadow: var(--glow-blue);
  transform: translateY(-6px);
  background: rgba(10, 30, 70, 0.95);
}

.contact-icon {
  width: 56px; height: 56px;
  background: rgba(59, 139, 255, 0.1);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition: all 0.3s ease;
}

.contact-card:hover .contact-icon {
  background: rgba(59, 139, 255, 0.2);
  box-shadow: var(--glow-blue);
}

.contact-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.contact-value {
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* ===== CONTACT FORM ===== */
.contact-form {
  margin-top: 3rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-field label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.form-field input,
.form-field textarea {
  font-family: var(--font-main);
  font-size: 0.95rem;
  color: var(--text-primary);
  background: rgba(59, 139, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  resize: vertical;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--text-muted);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(59, 139, 255, 0.25);
}

.form-submit {
  border: none;
  align-self: flex-start;
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-status {
  font-size: 0.88rem;
  min-height: 1.2em;
  margin: 0;
}

.form-status.success { color: #4ade80; }
.form-status.error { color: #f87171; }

@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 1.5rem; }
}

/* ===== HOBBIES SECTION ===== */
.hobbies {
  background: linear-gradient(180deg, transparent 0%, rgba(7, 21, 37, 0.5) 50%, transparent 100%);
}

.hobbies-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.hobby-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 2rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(20px);
  cursor: default;
  transition: all 0.35s ease;
  opacity: 0;
  transform: translateY(20px);
}

.hobby-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.hobby-item:hover {
  border-color: var(--accent);
  box-shadow: 0 0 24px rgba(59, 139, 255, 0.35);
  transform: translateY(-6px);
  background: rgba(10, 30, 70, 0.95);
}

.hobby-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  background: rgba(59, 139, 255, 0.08);
  border-radius: 14px;
  padding: 10px;
  transition: all 0.35s ease;
}

.hobby-icon svg {
  width: 100%;
  height: 100%;
}

.hobby-item:hover .hobby-icon {
  color: var(--accent3);
  background: rgba(64, 224, 255, 0.12);
  box-shadow: 0 0 16px rgba(64, 224, 255, 0.3);
  transform: scale(1.15);
}

.hobby-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-align: center;
  transition: color 0.3s ease;
}

.hobby-item:hover .hobby-label {
  color: var(--text-primary);
}

@media (max-width: 900px) {
  .hobbies-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 640px) {
  .hobbies-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  .hobby-item {
    padding: 1.5rem 0.8rem;
  }
}

/* ===== CERTIFICATIONS SECTION ===== */
.certs {
  background: linear-gradient(180deg, transparent 0%, rgba(7, 21, 37, 0.6) 50%, transparent 100%);
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
  margin-top: 3rem;
}

.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(16px);
}

.cert-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.cert-card:hover {
  border-color: var(--border-bright);
  box-shadow: var(--glow-blue);
  transform: translateY(-4px);
}

.cert-card.in-progress {
  border-color: rgba(240, 192, 64, 0.3);
  background: rgba(240, 192, 64, 0.04);
}

.cert-card.in-progress:hover {
  border-color: rgba(240, 192, 64, 0.6);
  box-shadow: var(--glow-gold);
}

.cert-badge {
  position: absolute;
  top: 0; right: 0;
  background: linear-gradient(135deg, var(--accent2), #e0a020);
  color: #1a1000;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-bottom-left-radius: 8px;
}

.cert-year {
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.06em;
}

.cert-icon {
  font-size: 1.6rem;
  margin: 0.3rem 0;
}

.cert-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.cert-issuer {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===== INFRASTRUCTURE SCENE ===== */
.infra-section {
  position: relative;
  height: 120px;
  overflow: hidden;
  background: transparent;
  margin-top: -60px; /* pull it up slightly into previous section visually if needed */
  z-index: 5;
}

.infra-scene {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 100%;
}

.infra-el {
  position: absolute;
  bottom: 0;
  transform-origin: bottom center;
  opacity: 0.6;
  pointer-events: none;
  filter: drop-shadow(0 0 5px rgba(96, 160, 224, 0.4));
}

/* ===== FOOTER ===== */
.footer {
  background: rgba(4, 10, 20, 0.9);
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scrollDot {
  0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.3; transform: translateX(-50%) translateY(8px); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 10px rgba(59, 139, 255, 0.3); }
  50% { box-shadow: 0 0 25px rgba(59, 139, 255, 0.7); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .timeline::before { left: 40px; }
  .timeline-item {
    grid-template-columns: 80px 1fr;
    direction: ltr !important;
  }
  .timeline-item.right { direction: ltr; }
  .timeline-item .timeline-card,
  .timeline-item.right .timeline-card {
    grid-column: 2;
  }
  .timeline-item.right .timeline-marker {
    grid-column: 1;
    grid-row: 1;
  }
  .timeline-item.right .timeline-card {
    grid-column: 2;
    grid-row: 1;
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  .about-links { justify-content: center; }
  .about-tags { justify-content: center; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .hero-stats { gap: 1rem; }
  section { padding: 80px 0; }
  .timeline-item { grid-template-columns: 60px 1fr; gap: 0; }
  .tower-icon { width: 40px; height: 55px; }
}