/* ==========================================================================
   ĐỖ ANH TÚ - DIGITAL MARKETING PORTFOLIO STYLES
   Theme: Modern Dark / Data-Driven Tech Mode
   Accents: Neon Cyan (#06b6d4), Electric Blue (#3b82f6), Emerald (#10b981)
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
  --bg-primary: #070b14;
  --bg-secondary: #0b1120;
  --bg-tertiary: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --glass-bg: rgba(15, 23, 42, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-border-hover: rgba(6, 182, 212, 0.4);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dimmed: #64748b;

  --accent-cyan: #06b6d4;
  --accent-cyan-light: #22d3ee;
  --accent-blue: #3b82f6;
  --accent-blue-light: #60a5fa;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;

  --gradient-primary: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
  --gradient-cyan-blue: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --gradient-card: linear-gradient(180deg, rgba(30, 41, 59, 0.4) 0%, rgba(15, 23, 42, 0.7) 100%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(6, 182, 212, 0.25);
  --shadow-glow-blue: 0 0 35px rgba(59, 130, 246, 0.25);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-mono: 'Space Grotesk', monospace;
}

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

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Selection */
::selection {
  background: rgba(6, 182, 212, 0.3);
  color: #ffffff;
}

/* Typography Utility */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul {
  list-style: none;
}

/* Ambient Glowing Background Orbs */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(130px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.45;
  animation: floatOrb 18s ease-in-out infinite alternate;
}

.glow-1 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.35) 0%, rgba(6, 182, 212, 0) 70%);
  top: -100px;
  left: -150px;
}

.glow-2 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.3) 0%, rgba(59, 130, 246, 0) 70%);
  top: 35%;
  right: -200px;
  animation-duration: 22s;
}

.glow-3 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.25) 0%, rgba(139, 92, 246, 0) 70%);
  bottom: 10%;
  left: 10%;
  animation-duration: 26s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 60px) scale(1.1); }
  100% { transform: translate(-30px, 30px) scale(0.95); }
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Utility Classes --- */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-cyan { color: var(--accent-cyan); }
.text-emerald { color: var(--accent-emerald); }
.text-blue { color: var(--accent-blue); }

.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-panel:hover {
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(6, 182, 212, 0.15);
  transform: translateY(-4px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  font-family: var(--font-main);
  font-weight: 600;
  border-radius: var(--radius-full);
  padding: 0.75rem 1.6rem;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  outline: none;
  text-align: center;
  white-space: nowrap;
}

.btn-sm {
  padding: 0.5rem 1.15rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.95rem 2rem;
  font-size: 1.05rem;
}

.btn-primary {
  background: var(--gradient-cyan-blue);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 25px rgba(6, 182, 212, 0.6);
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.08);
  transform: translateY(-2px);
}

.btn-glass {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(8px);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

.glow-btn {
  position: relative;
  overflow: hidden;
}

.glow-btn::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    60deg,
    transparent 0%,
    rgba(255, 255, 255, 0.2) 50%,
    transparent 100%
  );
  transform: rotate(30deg) translateX(-100%);
  transition: transform 0.75s ease;
}

.glow-btn:hover::after {
  transform: rotate(30deg) translateX(100%);
}

/* Category Badge */
.category-badge {
  display: inline-block;
  padding: 0.3rem 0.85rem;
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: var(--accent-cyan-light);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

/* Section Common Header */
.section {
  padding: 6.5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.8rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  color: var(--accent-cyan);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  margin-bottom: 1.1rem;
  letter-spacing: -0.5px;
  text-wrap: balance;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* --- Header & Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.1rem 0;
  background: rgba(7, 11, 20, 0.75);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition-normal);
}

.site-header.scrolled {
  padding: 0.8rem 0;
  background: rgba(7, 11, 20, 0.92);
  border-bottom-color: rgba(6, 182, 212, 0.2);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.logo-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--gradient-cyan-blue);
  color: #ffffff;
  font-weight: 800;
  font-size: 0.95rem;
  font-family: var(--font-mono);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.logo-text .dot {
  color: var(--accent-cyan);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.3rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: width var(--transition-fast);
  border-radius: var(--radius-full);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
  flex-direction: column;
  justify-content: space-between;
}

.mobile-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background: var(--text-primary);
  border-radius: 3px;
  transition: all var(--transition-fast);
}

/* --- Hero Section --- */
.hero-section {
  padding-top: 10.5rem;
  padding-bottom: 5.5rem;
  min-height: 90vh;
  display: flex;
  align-items: center;
  position: relative;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3.5rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-emerald);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.pulse-indicator {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulseEmerald 2s infinite;
}

@keyframes pulseEmerald {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-name {
  margin-bottom: 0.85rem;
  letter-spacing: -0.5px;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.hero-greeting {
  font-size: clamp(1.35rem, 2.2vw, 1.85rem);
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: -0.3px;
}

.hero-fullname {
  font-size: clamp(2.6rem, 4.8vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -1px;
  white-space: nowrap;
  line-height: 1.15;
}

.hero-typing-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  min-height: 40px;
}

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

.typing-text {
  color: var(--accent-cyan-light);
  font-family: var(--font-mono);
}

.typing-cursor {
  color: var(--accent-cyan);
  animation: blink 0.85s infinite;
  font-weight: 300;
}

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

.hero-description {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.8rem;
}

.hero-description strong {
  color: var(--text-primary);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.2rem;
}

.mini-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.mini-badge i {
  color: var(--accent-cyan);
}

.hero-buttons {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  margin-bottom: 2.5rem;
}

.hero-contact-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 1.8rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.inline-item {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.inline-item i {
  color: var(--accent-cyan);
}

/* Avatar Card & Visual */
.hero-visual {
  display: flex;
  justify-content: center;
  position: relative;
}

.avatar-card-wrapper {
  position: relative;
  width: 100%;
  max-width: 380px;
}

.avatar-glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: 1.8rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 40px rgba(6, 182, 212, 0.15);
  text-align: center;
  position: relative;
}

.avatar-img-container {
  width: 240px;
  height: 240px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  position: relative;
  padding: 8px;
  background: linear-gradient(135deg, #06b6d4, #3b82f6, #8b5cf6);
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.35);
}

.avatar-img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: #ffffff;
}

.avatar-ring {
  position: absolute;
  top: -8px;
  left: -8px;
  right: -8px;
  bottom: -8px;
  border-radius: 50%;
  border: 2px dashed rgba(6, 182, 212, 0.4);
  animation: rotateRing 25s linear infinite;
}

@keyframes rotateRing {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.avatar-info-card {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-align: left;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
}

.info-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.info-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.5px;
}

.info-value {
  font-size: 0.88rem;
  color: var(--text-primary);
  font-weight: 700;
}

/* Floating Badges */
.floating-badge {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 0.7rem 1.1rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  font-size: 0.82rem;
  z-index: 2;
  animation: floatMini 4s ease-in-out infinite alternate;
}

.floating-badge i {
  font-size: 1.35rem;
}

.floating-badge strong {
  display: block;
  color: var(--text-primary);
  font-size: 0.88rem;
}

.floating-badge span {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.badge-top {
  top: -20px;
  left: -25px;
  border-left: 3px solid var(--accent-cyan);
}

.badge-bottom {
  bottom: -20px;
  right: -25px;
  border-left: 3px solid var(--accent-emerald);
  animation-delay: -2s;
}

@keyframes floatMini {
  0% { transform: translateY(0); }
  100% { transform: translateY(-10px); }
}

/* --- Metrics / Stats Banner --- */
.metrics-section {
  padding: 3rem 0;
  position: relative;
  z-index: 5;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.metric-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1.8rem 1.4rem;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  position: relative;
}

.metric-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.metric-icon {
  font-size: 1.8rem;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}

.metric-number {
  font-size: clamp(2.2rem, 3vw, 2.9rem);
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.45rem;
}

.metric-number .unit {
  color: var(--accent-cyan);
  font-weight: 700;
  font-size: 1.8rem;
  margin-left: 2px;
}

.metric-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

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

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.about-card {
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
}

.about-icon-header {
  margin-bottom: 1.3rem;
}

.icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.25);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1.1rem;
}

.about-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
}

.about-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.check-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.2rem;
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.check-list li i {
  color: var(--accent-cyan);
  margin-top: 3px;
  font-size: 0.8rem;
}

/* --- Skills Section --- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.skill-group {
  padding: 2.2rem;
}

.group-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.8rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.group-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.group-header h4 {
  font-size: 1.2rem;
  color: var(--text-primary);
}

.skill-items {
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.skill-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.skill-pct {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-cyan);
}

.skill-bar {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.skill-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--gradient-cyan-blue);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
  width: 0;
  transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Career Timeline Section --- */
.timeline-container {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 0;
}

.timeline-container::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 28px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-cyan) 0%, var(--accent-blue) 50%, rgba(255,255,255,0.05) 100%);
  border-radius: var(--radius-full);
}

.timeline-item {
  position: relative;
  padding-left: 75px;
  margin-bottom: 2.8rem;
}

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

.timeline-dot {
  position: absolute;
  left: 10px;
  top: 0;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-cyan);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.5);
  z-index: 2;
}

.timeline-content {
  padding: 2.2rem;
}

.timeline-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  padding: 0.25rem 0.8rem;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--radius-full);
  margin-bottom: 0.8rem;
}

.company-name {
  font-size: 1.4rem;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
}

.job-title {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--accent-blue-light);
  margin-bottom: 1.1rem;
}

.job-summary {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.3rem;
}

.job-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.highlight-item i {
  margin-top: 4px;
  font-size: 0.85rem;
}

.tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding-top: 1.1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.tech-tag {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}

/* --- Portfolio & Case Studies Section --- */
.filter-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 3.2rem;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.55rem 1.3rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
}

.filter-btn.active {
  background: var(--gradient-cyan-blue);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.35);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.portfolio-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  height: 100%;
}

.project-img-box {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: #0f172a;
}

.project-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.portfolio-card:hover .project-img-box img {
  transform: scale(1.06);
}

.project-img-box .category-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  z-index: 2;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.project-info {
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-title {
  font-size: 1.18rem;
  margin-bottom: 0.75rem;
  line-height: 1.35;
  color: var(--text-primary);
}

.project-summary {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.4rem;
  flex-grow: 1;
}

.project-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 0.85rem 0.6rem;
  text-align: center;
  margin-bottom: 1.4rem;
}

.stat-item strong {
  display: block;
  font-size: 0.98rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.stat-item span {
  font-size: 0.72rem;
  color: var(--text-dimmed);
}

/* --- Services Section --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.service-card {
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
}

.service-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.25);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.4rem;
}

.service-title {
  font-size: 1.22rem;
  margin-bottom: 0.85rem;
}

.service-desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.4rem;
  flex-grow: 1;
}

.service-features {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.service-features li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2.8rem;
  align-items: start;
}

.contact-info-panel,
.contact-form-panel {
  padding: 2.8rem;
}

.contact-info-panel h3,
.contact-form-panel h3 {
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
}

.contact-info-panel p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  margin-bottom: 2.2rem;
}

.contact-method-card {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  transition: all var(--transition-normal);
}

.contact-method-card:hover {
  background: rgba(6, 182, 212, 0.08);
  border-color: var(--accent-cyan);
  transform: translateX(5px);
}

.method-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  flex-shrink: 0;
}

.method-title {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.4px;
}

.method-detail {
  font-size: 1.05rem;
  color: var(--text-primary);
  font-weight: 700;
}

.cv-download-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(6, 182, 212, 0.08);
  border: 1px dashed rgba(6, 182, 212, 0.35);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  gap: 1rem;
}

.cv-info strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.cv-info span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Contact Form Elements */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group label .required {
  color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.1rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.form-group select option {
  background: #0f172a;
  color: #ffffff;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

.form-success-banner {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  padding: 1.4rem;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-md);
  margin-top: 1.2rem;
}

.form-success-banner i {
  font-size: 2.2rem;
}

.form-success-banner strong {
  display: block;
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.form-success-banner p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* --- Modal Windows --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(7, 11, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-window {
  background: #0f172a;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  max-width: 820px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7);
  display: none;
  transform: scale(0.92);
  transition: transform var(--transition-normal);
  padding: 2.2rem;
}

.modal-window.active {
  display: block;
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

.modal-header {
  margin-bottom: 1.5rem;
  padding-right: 2.5rem;
}

.modal-header h2 {
  font-size: 1.6rem;
  margin-top: 0.6rem;
}

.modal-img-wrap {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 1.8rem;
  background: #070b14;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.modal-img-wrap img {
  width: 100%;
  max-height: 380px;
  object-fit: contain;
}

.modal-text h4 {
  font-size: 1.15rem;
  margin: 1.4rem 0 0.6rem;
  color: var(--accent-cyan-light);
}

.modal-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.modal-text ul {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.2rem;
}

.modal-text li {
  position: relative;
  padding-left: 1.3rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.modal-text li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

.modal-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.mstat-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 1rem 0.6rem;
  text-align: center;
}

.mstat-card strong {
  display: block;
  font-size: 1.3rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.mstat-card span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- Floating Actions --- */
.floating-actions {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  z-index: 999;
}

.float-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  color: #ffffff;
  border: none;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-normal);
  position: relative;
}

.float-btn:hover {
  transform: scale(1.1);
}

.zalo-float {
  background: #0068ff;
  box-shadow: 0 4px 18px rgba(0, 104, 255, 0.5);
  animation: pulseZalo 2.5s infinite;
}

@keyframes pulseZalo {
  0% { box-shadow: 0 0 0 0 rgba(0, 104, 255, 0.7); }
  70% { box-shadow: 0 0 0 12px rgba(0, 104, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 104, 255, 0); }
}

.phone-float {
  background: var(--accent-emerald);
  box-shadow: 0 4px 18px rgba(16, 185, 129, 0.5);
}

.back-to-top {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  opacity: 0;
  visibility: hidden;
  transform: translateY(15px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.float-tooltip {
  position: absolute;
  right: 60px;
  background: #0f172a;
  color: #ffffff;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.float-btn:hover .float-tooltip {
  opacity: 1;
}

/* --- Footer --- */
.site-footer {
  background: #04070d;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 5rem 0 2rem;
}

.footer-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3.5rem;
  margin-bottom: 3.5rem;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 440px;
  margin-top: 1rem;
  line-height: 1.65;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.link-col h5 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 1.1rem;
}

.link-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.link-col li,
.link-col a {
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.link-col a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
}

.bottom-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-dimmed);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background: var(--accent-cyan);
  color: #ffffff;
  transform: translateY(-2px);
}

/* --- Scroll Reveal Animations --- */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1), transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.active {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* --- Responsive Media Queries --- */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 3.5rem;
    text-align: center;
  }

  .status-pill,
  .hero-typing-box,
  .hero-badges,
  .hero-buttons,
  .hero-contact-inline {
    justify-content: center;
  }

  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid,
  .portfolio-grid,
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-container {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: rgba(7, 11, 20, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem 1.5rem;
    display: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  }

  .nav-menu.active {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.3rem;
  }

  .nav-actions .btn {
    display: none;
  }

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

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

  .timeline-container::before {
    left: 18px;
  }

  .timeline-dot {
    left: 0;
    width: 34px;
    height: 34px;
    font-size: 0.85rem;
  }

  .timeline-item {
    padding-left: 50px;
  }

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

  .bottom-content {
    flex-direction: column;
    gap: 1.2rem;
    text-align: center;
  }

  .modal-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .floating-actions {
    bottom: 1.2rem;
    right: 1.2rem;
  }

  .float-btn {
    width: 44px;
    height: 44px;
    font-size: 1.15rem;
  }
}

@media (max-width: 480px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-buttons .btn {
    width: 100%;
  }

  .avatar-card-wrapper {
    max-width: 290px;
  }

  .avatar-img-container {
    width: 180px;
    height: 180px;
  }

  .badge-top, .badge-bottom {
    display: none;
  }
}