/* =========================================
   PORTFOLIO CSS - TUYỂN NGUYỄN
   Developer Dark Theme
   Font: Be Vietnam Pro
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,400&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ---- CSS Variables ---- */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #0f1526;
  --bg-card: #131929;
  --bg-card-hover: #1a2138;
  --accent-cyan: #00d4ff;
  --accent-purple: #7c3aed;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
  --gradient-hero: linear-gradient(160deg, #0a0e1a 0%, #0f1526 50%, #12172e 100%);
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: rgba(255,255,255,0.07);
  --border-accent: rgba(0, 212, 255, 0.25);
  --glass: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.08);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.12);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: 'Be Vietnam Pro', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

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

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

::selection {
  background: rgba(0, 212, 255, 0.25);
  color: #fff;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: #fff;
}

img {
  max-width: 100%;
  display: block;
}

ul { list-style: none; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: var(--accent-purple);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent-cyan); }

/* ---- Preloader ---- */
#preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

#preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.preloader-inner {
  text-align: center;
}

.preloader-logo {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--accent-cyan);
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeIn 0.5s 0.2s forwards;
}

.preloader-bar {
  width: 200px;
  height: 2px;
  background: var(--bg-card);
  border-radius: 2px;
  overflow: hidden;
  margin: 0 auto;
}

.preloader-progress {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 2px;
  animation: loadBar 1.5s ease forwards;
}

@keyframes loadBar {
  from { width: 0; }
  to { width: 100%; }
}

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

/* ---- Custom Cursor ---- */
.cursor-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9998;
  transition: transform 0.1s ease;
}

.cursor-ring {
  width: 36px;
  height: 36px;
  border: 1.5px solid rgba(0, 212, 255, 0.5);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9997;
  transition: transform 0.15s ease, width 0.2s ease, height 0.2s ease, border-color 0.2s ease;
}

/* ---- Noise Overlay ---- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* ---- Grid Background ---- */
.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

/* ================================
   NAVBAR
   ================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 12px 0;
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

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

.nav-logo .logo-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 50%;
  margin-left: 4px;
  animation: blink 1.2s step-end infinite;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: 8px;
  transition: var(--transition);
  position: relative;
}

.nav-link::before {
  content: attr(data-num);
  color: var(--accent-cyan);
  margin-right: 4px;
  font-size: 0.7rem;
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
  background: var(--glass);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-call {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-cyan);
  border: 1px solid var(--border-accent);
  padding: 8px 18px;
  border-radius: 8px;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-call:hover {
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
}

.btn-call svg {
  width: 14px;
  height: 14px;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

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

/* Mobile Nav */
.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 26, 0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 80px 24px 40px;
}

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

.nav-mobile .nav-link {
  font-size: 1.1rem;
  padding: 14px 28px;
  width: 100%;
  max-width: 300px;
  text-align: center;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

/* ================================
   SECTIONS COMMON
   ================================ */
section {
  position: relative;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.section-tag::before {
  content: '//';
  opacity: 0.6;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

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

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 16px auto 0;
  line-height: 1.8;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.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; }

/* ================================
   HERO SECTION
   ================================ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
  padding-top: 80px;
  width: 100%;
  max-width: 100vw;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

.hero-glow-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.15), transparent 70%);
  top: -100px;
  right: -100px;
}

.hero-glow-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.1), transparent 70%);
  bottom: -50px;
  left: -50px;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 80px 0;
  width: 100%;
  min-width: 0;
}

/* Terminal Window */
.terminal-window {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  animation: float 6s ease-in-out infinite;
}

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

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border-color);
}

.terminal-btn {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.terminal-btn.red { background: #ff5f57; }
.terminal-btn.yellow { background: #febc2e; }
.terminal-btn.green { background: #28c840; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 8px;
}

.terminal-body {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.9;
}

.terminal-line {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.terminal-prompt { color: var(--accent-cyan); }
.terminal-cmd { color: #e2e8f0; }
.terminal-comment { color: var(--text-muted); font-style: italic; }
.terminal-string { color: #a8ff78; }
.terminal-key { color: var(--accent-orange); }
.terminal-value { color: var(--accent-cyan); }
.terminal-output { color: var(--text-secondary); padding-left: 20px; }

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 16px;
  background: var(--accent-cyan);
  vertical-align: middle;
  animation: blink 1s step-end infinite;
  margin-left: 2px;
}

/* Hero Content */
.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-green);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 6px 14px;
  border-radius: 100px;
  width: fit-content;
}

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

@keyframes pulse-green {
  0%, 100% { box-shadow: 0 0 0 0 rgba(16,185,129,0.4); }
  50% { box-shadow: 0 0 0 6px rgba(16,185,129,0); }
}

.hero-name {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: #fff;
}

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

.hero-role {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--accent-cyan);
  min-height: 1.6em;
}

.hero-role .role-prefix { color: var(--text-muted); }

.hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 480px;
  word-break: break-word;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.hero-stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.hero-stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ================================
   BUTTONS
   ================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.25);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
}

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

.btn-outline:hover {
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.07);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

/* ================================
   ABOUT SECTION
   ================================ */
#about {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: center;
}

.about-image-wrap {
  position: relative;
}

.about-avatar-frame {
  position: relative;
  display: inline-block;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.about-avatar-frame img {
  width: 100%;
  max-width: 420px;
  border-radius: var(--radius-lg);
  filter: grayscale(20%);
  transition: var(--transition);
}

.about-avatar-frame:hover img {
  filter: grayscale(0);
}

.about-avatar-frame::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: var(--gradient-primary);
  border-radius: calc(var(--radius-lg) + 2px);
  z-index: -1;
  opacity: 0.6;
}

.about-exp-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.about-exp-num {
  font-size: 2rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.about-exp-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 4px;
}

.about-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-text p {
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 16px;
}

.about-text p:last-child { margin-bottom: 0; }

.about-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.about-info-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: var(--transition);
}

.about-info-item:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.about-info-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
}

.about-info-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.about-info-value a {
  color: var(--text-primary);
}

.about-info-value a:hover {
  color: var(--accent-cyan);
}

/* ================================
   SKILLS SECTION
   ================================ */
#skills {
  padding: 120px 0;
  background: var(--bg-primary);
}

.skills-categories {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.skills-cat-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.skills-cat-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.skill-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 10px 16px;
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: default;
}

.skill-badge:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

.skill-badge img {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.skill-badge-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ================================
   SERVICES SECTION
   ================================ */
#services {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  cursor: default;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: var(--transition);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.service-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 1.5rem;
}

.service-icon.cyan { background: rgba(0, 212, 255, 0.1); color: var(--accent-cyan); }
.service-icon.purple { background: rgba(124, 58, 237, 0.1); color: #a78bfa; }
.service-icon.green { background: rgba(16, 185, 129, 0.1); color: var(--accent-green); }
.service-icon.orange { background: rgba(245, 158, 11, 0.1); color: var(--accent-orange); }

.service-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

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

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 20px;
}

.service-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--glass);
  border: 1px solid var(--border-color);
  padding: 3px 10px;
  border-radius: 100px;
}

/* ================================
   PROJECTS SECTION
   ================================ */
#projects {
  padding: 120px 0;
  background: var(--bg-primary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

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

.project-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.project-img-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
}

.project-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .project-img-wrap img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,14,26,0.95) 0%, rgba(10,14,26,0.3) 60%, transparent 100%);
  display: flex;
  align-items: flex-end;
  padding: 24px;
  opacity: 0;
  transition: var(--transition);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-view-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-cyan);
  border: 1px solid var(--border-accent);
  background: rgba(0, 212, 255, 0.1);
  padding: 8px 16px;
  border-radius: var(--radius);
}

.project-info {
  padding: 20px 22px;
}

.project-tag-wrap {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.project-type {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.18);
  padding: 3px 10px;
  border-radius: 100px;
}

.project-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,0.9);
  align-items: center;
  justify-content: center;
  padding: 24px;
  backdrop-filter: blur(8px);
}

.lightbox.open {
  display: flex;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-lg);
  box-shadow: 0 0 60px rgba(0,0,0,0.8);
}

.lightbox-close {
  position: fixed;
  top: 24px;
  right: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  transition: var(--transition);
}

.lightbox-close:hover {
  background: var(--bg-card-hover);
  color: var(--accent-cyan);
}

/* ================================
   CONTACT SECTION
   ================================ */
#contact {
  padding: 120px 0;
  background: var(--bg-secondary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 60px;
  align-items: start;
}

.contact-info-block {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}

.contact-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.contact-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
}

.contact-card-icon.cyan { background: rgba(0,212,255,0.1); color: var(--accent-cyan); }
.contact-card-icon.purple { background: rgba(124,58,237,0.1); color: #a78bfa; }
.contact-card-icon.green { background: rgba(16,185,129,0.1); color: var(--accent-green); }
.contact-card-icon.orange { background: rgba(245,158,11,0.1); color: var(--accent-orange); }

.contact-card-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.contact-card-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-card-value a {
  color: var(--text-primary);
}

.contact-card-value a:hover {
  color: var(--accent-cyan);
}

/* Social links */
.social-links {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
  text-decoration: none;
}

.social-link:hover {
  border-color: var(--border-accent);
  background: rgba(0,212,255,0.08);
  color: var(--accent-cyan);
  transform: translateY(-3px);
}

/* Form */
.contact-form-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.form-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.form-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-group:last-child { margin-bottom: 0; }

.form-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.form-control {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.9rem;
  padding: 12px 16px;
  transition: var(--transition);
  outline: none;
  width: 100%;
}

.form-control:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-control::placeholder {
  color: var(--text-muted);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.form-services {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.form-check {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 10px 14px;
  cursor: pointer;
  transition: var(--transition);
}

.form-check:hover {
  border-color: var(--border-accent);
}

.form-check input[type="checkbox"] {
  accent-color: var(--accent-cyan);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.form-check input[type="checkbox"]:checked + .check-label {
  color: var(--accent-cyan);
}

.check-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-submit {
  width: 100%;
  padding: 14px;
  font-size: 0.95rem;
  font-weight: 700;
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.3);
}

/* ================================
   FOOTER
   ================================ */
footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

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

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

.footer-links {
  display: flex;
  gap: 20px;
}

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

.footer-links a:hover {
  color: var(--accent-cyan);
}

/* ================================
   BACK TO TOP
   ================================ */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 500;
  color: var(--accent-cyan);
}

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

.back-top:hover {
  background: rgba(0,212,255,0.1);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

/* ================================
   RESPONSIVE
   ================================ */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 60px 0 40px;
  }

  .terminal-window {
    max-width: 600px;
    margin: 0 auto;
    animation: none;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-avatar-frame {
    max-width: 360px;
    margin: 0 auto;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .nav-menu, .nav-cta { display: none; }
  .hamburger { display: flex; }

  /* Hero fixes for mobile */
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 0 32px;
    overflow: hidden;
  }

  .hero-content {
    gap: 18px;
    min-width: 0;
    width: 100%;
  }

  .hero-name {
    font-size: clamp(1.8rem, 8vw, 2.8rem);
    word-break: break-word;
  }

  .hero-desc {
    font-size: 0.93rem;
    max-width: 100%;
  }

  .hero-badge {
    font-size: 0.72rem;
    padding: 5px 12px;
  }

  .hero-role {
    font-size: 0.9rem;
  }

  .terminal-window {
    max-width: 100%;
    width: 100%;
    overflow-x: auto;
    animation: none;
  }

  .terminal-body {
    font-size: 0.78rem;
    padding: 16px;
  }

  .hero-stats {
    gap: 20px;
    flex-wrap: wrap;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .form-services {
    grid-template-columns: 1fr;
  }

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

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

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

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

  .contact-form-wrap {
    padding: 24px;
  }

  /* Ensure container doesn't overflow */
  .container {
    padding: 0 16px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 14px;
  }

  .hero-inner {
    padding: 32px 0 24px;
  }

  .hero-name {
    font-size: clamp(1.6rem, 7.5vw, 2.4rem);
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-stats {
    gap: 14px;
    flex-wrap: wrap;
  }

  .hero-stat-num { font-size: 1.4rem; }

  .terminal-window {
    display: none; /* Ẩn terminal trên màn hình rất nhỏ để tránh overflow */
  }

  .section-header {
    margin-bottom: 40px;
  }
}

@media (max-width: 360px) {
  .container {
    padding: 0 12px;
  }

  .hero-name {
    font-size: 1.5rem;
  }

  .btn {
    font-size: 0.82rem;
    padding: 10px 18px;
  }

  .hero-badge {
    font-size: 0.68rem;
    padding: 4px 10px;
  }
}

/* ================================
   SECTION DIVIDER
   ================================ */
.section-divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border-color) 50%, transparent);
}

/* Glow line decorations */
.glow-line {
  position: absolute;
  height: 1px;
  background: var(--gradient-primary);
  opacity: 0.3;
}