/* ==========================================================================
   PORTFOLIO DESIGN SYSTEM - TRẦN TÂN (TRANTAN MEDIA)
   Aesthetic: Flat Cosmic Agency / Precision Creative Studio
   Palette: Deep Space Void & Midnight Obsidian
            Pulsar Cyan & Celestial Indigo
   ========================================================================== */

@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;1,600&family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400;1,600&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  /* Cosmic Void Palette */
  --bg-main: #06070a;
  --bg-surface: #0a0d15;
  --bg-surface-elevated: #0f1320;
  --bg-card: #0c0f18;
  --bg-glass: rgba(10, 13, 21, 0.92);
  --bg-glass-card: rgba(12, 15, 24, 0.85);

  /* Accents - Pulsar Cyan & Celestial Indigo */
  --accent-sapphire: #0284c7;
  --accent-cyan: #38bdf8;
  --accent-azure: #60a5fa;
  --accent-nebula: #818cf8;
  --accent-ocean-deep: #0369a1;
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);
  --accent-gradient-subtle: linear-gradient(135deg, rgba(56, 189, 248, 0.12) 0%, rgba(99, 102, 241, 0.04) 100%);

  /* Starlight Silver */
  --accent-platinum: #f8fafc;
  --accent-silver: #cbd5e1;

  /* Text Colors */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #06070a;

  /* Flat Precision Borders & Hairlines */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hairline: #171b26;
  --border-hover: rgba(56, 189, 248, 0.45);
  --shadow-card: none;
  --shadow-glow-sapphire: none;

  /* Typography - Clean Sans-Serif + Cosmic Technical Monospace */
  --font-display: 'Be Vietnam Pro', 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-body: 'Be Vietnam Pro', 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'Space Grotesk', ui-monospace, SFMono-Regular, monospace;

  /* Flat Agency Radii */
  --container-max: 1240px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-full: 4px;
  --header-height: 76px;
  --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
  color-scheme: dark;
  overflow-x: hidden;
}

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

/* Cosmic Starfield Canvas */
.cosmic-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.85;
}

/* Subtle Cosmic Deep Space Nebula Glow */
.bg-ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(160px);
  opacity: 0.08;
  will-change: transform;
}

.orb-1 {
  width: 650px;
  height: 650px;
  background: #0284c7;
  top: -120px;
  right: -100px;
  animation: floatOrb 25s infinite alternate ease-in-out;
}

.orb-2 {
  width: 550px;
  height: 550px;
  background: #4f46e5;
  bottom: 10%;
  left: -120px;
  animation: floatOrb 30s infinite alternate-reverse ease-in-out;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-40px, 30px) scale(1.05); }
  100% { transform: translate(30px, -20px) scale(0.96); }
}

/* Custom Refined Scrollbar */
::-webkit-scrollbar {
  width: 7px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: #1a2642;
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-cyan);
}

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  outline: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   TYPOGRAPHY & UTILITIES
   ========================================================================== */

h1, h2, h3, h4, .font-display {
  font-family: var(--font-display);
  letter-spacing: -0.015em;
  font-weight: 700;
  line-height: 1.25;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  background: rgba(12, 16, 26, 0.9);
  border: 1px solid rgba(56, 189, 248, 0.28);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 18px;
}

.section-tag .tag-index {
  color: var(--text-muted);
  font-weight: 700;
}

.section-title {
  font-size: clamp(2.1rem, 4vw, 3.2rem);
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  font-weight: 800;
}

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

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Common Buttons - Flat Precision Agency Style */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  box-shadow: none;
}

.btn-primary {
  background: #f8fafc;
  color: #06070a;
  border: 1px solid #ffffff;
}

.btn-primary:hover {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: #06070a;
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 0.825rem;
}

/* ==========================================================================
   NAVIGATION HEADER
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 100;
  background: rgba(5, 8, 17, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.site-header.scrolled {
  background: rgba(5, 8, 17, 0.94);
  border-bottom-color: rgba(56, 189, 248, 0.2);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

.site-logo-img {
  height: 34px;
  max-height: 38px;
  width: auto;
  object-fit: contain;
  display: block;
  transition: transform var(--transition-fast);
}

.brand-logo:hover .site-logo-img {
  transform: scale(1.04);
}

.brand-badge {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.28);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
  letter-spacing: 0.02em;
}

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

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mobile-menu-btn {
  display: none;
  font-size: 1.5rem;
  color: var(--text-primary);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */

.hero-section {
  padding-top: calc(var(--header-height) + 50px);
  padding-bottom: 75px;
  position: relative;
  min-height: min(92vh, 920px);
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 60px;
  align-items: center;
}

.hero-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
  max-width: 100%;
}

.hero-status-badge span:last-child {
  white-space: normal;
  line-height: 1.4;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan);
  animation: pulseLight 2s infinite;
  flex-shrink: 0;
}

@keyframes pulseLight {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.35); opacity: 1; box-shadow: 0 0 20px var(--accent-cyan); }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-headline {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 22px;
  letter-spacing: -0.02em;
}

.hero-headline .text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-bio {
  font-size: 1.12rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 34px;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

/* Agency Core Disciplines Grid (Flat & Craft-Focused, Zero Arbitrary Metrics) */
.hero-disciplines-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.discipline-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  transition: var(--transition-smooth);
}

.discipline-box:hover {
  border-color: rgba(56, 189, 248, 0.4);
  background: var(--bg-surface-elevated);
  transform: translateY(-2px);
}

.discipline-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.discipline-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}

.discipline-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Hero Visual Column (Flat Cosmic Agency Reticle Frame) */
.hero-visual-col {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-avatar-frame {
  position: relative;
  width: 100%;
  max-width: 410px;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  background: rgba(8, 11, 18, 0.7);
}

.corner-crosshair {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--accent-cyan);
  line-height: 1;
  pointer-events: none;
  opacity: 0.8;
  user-select: none;
}

.crosshair-tl { top: -6px; left: -5px; }
.crosshair-tr { top: -6px; right: -5px; }
.crosshair-bl { bottom: -6px; left: -5px; }
.crosshair-br { bottom: -6px; right: -5px; }

.avatar-technical-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  padding: 0 4px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.telemetry-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.blink-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  animation: blinkDot 1.6s infinite ease-in-out;
}

@keyframes blinkDot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.avatar-card {
  position: relative;
  z-index: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
}

.avatar-img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  filter: contrast(1.02);
}

.avatar-card:hover .avatar-img {
  transform: scale(1.02);
}

.avatar-overlay-badge {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(6, 8, 13, 0.98) 0%, rgba(6, 8, 13, 0.88) 75%, transparent 100%);
  padding: 24px 16px 14px 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

.creator-tag-line {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
  font-weight: 600;
  margin-bottom: 3px;
}

.creator-info h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 2px;
  letter-spacing: -0.015em;
  font-weight: 700;
  white-space: nowrap;
}

.creator-info p {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
}

.avatar-spec-pills {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.spec-pill {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-secondary);
}

/* ==========================================================================
   BENTO SHOWCASE & WORKS SECTION
   ========================================================================== */

.works-section {
  padding: 110px 0;
  position: relative;
}

.filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 50px;
}

.filter-btn {
  padding: 10px 24px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  transition: var(--transition-smooth);
}

.filter-btn:hover {
  border-color: rgba(56, 189, 248, 0.3);
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
}

.filter-btn.active {
  background: var(--accent-sapphire);
  color: #ffffff;
  border-color: var(--accent-cyan);
  box-shadow: 0 4px 18px rgba(37, 99, 235, 0.45);
  font-weight: 700;
}

/* Bento Grid Layout */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 28px;
}

.bento-card {
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  position: relative;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.bento-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.8), 0 0 25px rgba(37, 99, 235, 0.2);
}

/* Bento Grid Spans */
.bento-card.span-7 {
  grid-column: span 7;
}

.bento-card.span-5 {
  grid-column: span 5;
}

.bento-card.span-6 {
  grid-column: span 6;
}

.bento-card.span-4 {
  grid-column: span 4;
}

.bento-card.span-12 {
  grid-column: span 12;
}

.card-media-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: #000;
  aspect-ratio: 16 / 10;
  cursor: pointer;
}

.card-media-wrapper.ratio-4-3 {
  aspect-ratio: 4 / 3;
}

.card-media-wrapper.ratio-1-1 {
  aspect-ratio: 1 / 1;
}

.card-media-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.bento-card:hover .card-media-img {
  transform: scale(1.06);
}

.media-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: rgba(5, 8, 17, 0.85);
  backdrop-filter: blur(10px);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 700;
  border: 1px solid rgba(255, 255, 255, 0.1);
  z-index: 2;
  letter-spacing: 0.04em;
}

/* Play button overlay on video cards */
.play-btn-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5, 8, 17, 0.35);
  transition: var(--transition-smooth);
}

.play-icon-circle {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.5);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.bento-card:hover .play-icon-circle {
  transform: scale(1.15);
}

.play-icon-circle svg {
  width: 22px;
  height: 22px;
  margin-left: 2px;
}

.card-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 0.825rem;
  color: var(--accent-cyan);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.card-title {
  font-size: 1.35rem;
  margin-bottom: 10px;
  color: var(--text-primary);
  line-height: 1.3;
}

.card-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.tag-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

/* Google Drive Repository Banner Card */
.drive-banner-card {
  grid-column: span 12;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(16, 25, 48, 0.95) 0%, rgba(10, 16, 32, 0.95) 100%);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 36px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
  margin-top: 10px;
}

.drive-banner-content h3 {
  font-size: 1.65rem;
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.drive-banner-content p {
  color: var(--text-secondary);
  max-width: 680px;
  font-size: 1.02rem;
  line-height: 1.6;
}

/* ==========================================================================
   INTERACTIVE BEFORE / AFTER COLOR GRADING SHOWCASE
   ========================================================================== */

.colorgrade-section {
  padding: 110px 0;
  background: var(--bg-surface);
  position: relative;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.slider-comparison-box {
  position: relative;
  width: 100%;
  max-width: 1040px;
  margin: 0 auto 36px auto;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  user-select: none;
  touch-action: none;
}

.slider-img-after {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.slider-img-after img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.slider-img-before {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 50%;
  overflow: hidden;
  z-index: 2;
  border-right: 2px solid var(--accent-cyan);
  box-shadow: 2px 0 20px rgba(56, 189, 248, 0.5);
}

.slider-img-before img {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  object-fit: cover;
}

.slider-handle {
  position: absolute;
  top: 0;
  left: 50%;
  width: 44px;
  height: 100%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: ew-resize;
}

.slider-handle-circle {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--accent-cyan);
  color: #050811;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.7);
  font-weight: 800;
  font-size: 1.1rem;
}

.slider-label {
  position: absolute;
  top: 20px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  background: rgba(5, 8, 17, 0.85);
  backdrop-filter: blur(10px);
  font-size: 0.825rem;
  font-weight: 700;
  z-index: 4;
  border: 1px solid rgba(255, 255, 255, 0.1);
  letter-spacing: 0.03em;
}

.label-before {
  left: 20px;
  color: var(--accent-silver);
}

.label-after {
  right: 20px;
  color: var(--accent-cyan);
}

.slider-note-grid {
  max-width: 1040px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.grade-tip-card {
  padding: 24px;
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.grade-tip-card:hover {
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateY(-3px);
}

.grade-tip-card h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--accent-cyan);
  letter-spacing: 0.02em;
}

.grade-tip-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   FEATURED CASE STUDY
   ========================================================================== */

.case-study-section {
  padding: 110px 0;
  position: relative;
}

.case-study-card {
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 50px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.case-study-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--accent-gradient);
}

.case-study-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 40px;
}

.case-study-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  line-height: 1.25;
  letter-spacing: 0.02em;
}

.case-grid-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.case-problem-box, .case-solution-box {
  padding: 28px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
}

.case-problem-box h4 {
  color: #f87171;
  margin-bottom: 12px;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.case-solution-box h4 {
  color: var(--accent-cyan);
  margin-bottom: 12px;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.case-steps-timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.step-card {
  padding: 22px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  position: relative;
  transition: var(--transition-smooth);
}

.step-card:hover {
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateY(-3px);
}

.step-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}

.step-card h5 {
  font-size: 0.98rem;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.case-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 32px;
  border-radius: var(--radius-md);
}

.metric-item {
  text-align: center;
}

.metric-val {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  line-height: 1;
  margin-bottom: 6px;
}

.metric-lbl {
  font-size: 0.92rem;
  color: var(--text-secondary);
  font-weight: 600;
}

/* ==========================================================================
   ABOUT & TIMELINE & TOOLKIT
   ========================================================================== */

.about-section {
  padding: 110px 0;
  position: relative;
}

.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 60px;
  align-items: flex-start;
  margin-bottom: 90px;
}

.about-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
}

.about-img {
  width: 100%;
  height: 590px;
  object-fit: cover;
  object-position: top center;
}

.about-content-box h3 {
  font-size: 2.2rem;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.about-content-box p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

/* Experience Timeline */
.timeline-title {
  font-size: 1.6rem;
  margin: 40px 0 24px 0;
  letter-spacing: 0.02em;
}

.timeline {
  position: relative;
  padding-left: 30px;
  border-left: 2px solid rgba(56, 189, 248, 0.2);
}

.timeline-item {
  position: relative;
  margin-bottom: 36px;
}

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

.timeline-dot {
  position: absolute;
  left: -37px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan);
}

.timeline-date {
  font-size: 0.825rem;
  font-weight: 800;
  color: var(--accent-cyan);
  text-transform: uppercase;
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}

.timeline-role {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.timeline-company {
  font-size: 0.95rem;
  color: var(--accent-gold);
  margin-bottom: 10px;
  font-weight: 600;
}

.timeline-tasks {
  list-style: none;
}

.timeline-tasks li {
  font-size: 0.92rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 18px;
  margin-bottom: 6px;
}

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

/* Toolkit Grid */
.toolkit-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.tool-card {
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  background: var(--bg-surface-elevated);
}

.tool-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.tool-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--accent-cyan);
}

.tool-level {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
}

.tool-name {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.tool-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   SERVICES & WORKFLOW
   ========================================================================== */

.services-section {
  padding: 110px 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 80px;
}

.service-card {
  padding: 40px 32px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  position: relative;
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: var(--shadow-card);
}

.service-badge {
  position: absolute;
  top: 20px;
  right: 24px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 700;
}

.service-icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.service-title {
  font-size: 1.4rem;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.service-features {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.service-features li {
  font-size: 0.925rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
}

.service-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-weight: bold;
}

/* 4-Step Workflow */
.workflow-box {
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--border-subtle);
}

.workflow-header {
  text-align: center;
  margin-bottom: 36px;
}

.workflow-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.workflow-item {
  position: relative;
  text-align: center;
}

.workflow-item-num {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 2px solid var(--accent-cyan);
  color: var(--accent-cyan);
  font-family: var(--font-display);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px auto;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.25);
}

.workflow-item h5 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

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

/* ==========================================================================
   CONTACT & BOOKING HUB
   ========================================================================== */

.contact-section {
  padding: 110px 0 80px 0;
  position: relative;
}

.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 60px;
}

.contact-info-col h3 {
  font-size: 2.4rem;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.contact-cards-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 32px 0;
}

.contact-quick-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.contact-quick-card:hover {
  border-color: rgba(56, 189, 248, 0.4);
  background: var(--bg-surface-elevated);
}

.quick-card-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.quick-icon {
  font-size: 1.4rem;
}

.quick-card-meta span {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.quick-card-meta strong {
  display: block;
  font-size: 1rem;
  color: var(--text-primary);
}

.copy-btn {
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-secondary);
  transition: var(--transition-smooth);
}

.copy-btn:hover {
  background: var(--accent-cyan);
  color: #06070a;
  border-color: var(--accent-cyan);
}

/* Booking Form - Flat Precision Style */
.booking-form-box {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 36px;
  box-shadow: none;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: #080a12;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.92rem;
  transition: var(--transition-smooth);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: none;
  background: #0b0e18;
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-main);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-logo-img {
  height: 28px;
  width: auto;
  object-fit: contain;
  display: block;
  margin-bottom: 8px;
  opacity: 0.9;
  transition: opacity var(--transition-fast);
}

.footer-logo-img:hover {
  opacity: 1;
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 16px;
}

.social-link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
}

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

/* ==========================================================================
   MODALS & LIGHTBOX & TOAST
   ========================================================================== */

.video-modal, .lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(3, 6, 14, 0.94);
  backdrop-filter: blur(18px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.video-modal.active, .lightbox-modal.active {
  display: flex;
  opacity: 1;
}

.video-modal-container {
  width: 100%;
  max-width: 960px;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  position: relative;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.9);
}

.modal-video-player {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
}

.modal-close-btn {
  position: absolute;
  top: -48px;
  right: 0;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-container {
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
}

.lightbox-caption {
  margin-top: 16px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  text-align: center;
}

.toast-container {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--accent-cyan);
  color: var(--text-primary);
  padding: 14px 22px;
  border-radius: var(--radius-full);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8), 0 0 20px rgba(56, 189, 248, 0.3);
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateY(30px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: auto;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* ==========================================================================
   RESPONSIVE DESIGN (TABLET & MOBILE)
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 50px;
    text-align: center;
  }
  .hero-headline {
    font-size: 3rem;
  }
  .hero-bio {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-disciplines-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bento-card.span-7, .bento-card.span-5, .bento-card.span-6, .bento-card.span-4 {
    grid-column: span 6;
  }
  .about-grid, .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .case-steps-timeline, .toolkit-grid, .workflow-steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 65px;
  }
  body, main {
    overflow-x: hidden;
    width: 100%;
  }
  .container {
    padding: 0 16px;
    width: 100%;
    max-width: 100%;
  }
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }
  .brand-logo {
    font-size: 1.15rem;
    gap: 8px;
    flex-shrink: 0;
  }
  .site-logo-img {
    height: 28px;
  }
  .brand-badge {
    display: none;
  }
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: rgba(5, 8, 17, 0.98);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    flex-direction: column;
    padding: 30px 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border-subtle);
    display: none;
    z-index: 100;
  }
  .nav-menu.open {
    display: flex;
  }
  .header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .header-actions .btn-sm {
    display: none;
  }
  .mobile-menu-btn {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 1.3rem;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    flex-shrink: 0;
  }
  .hero-section {
    padding-top: calc(var(--header-height) + 24px);
    padding-bottom: 50px;
    overflow-x: hidden;
  }
  .hero-status-badge {
    font-size: 0.75rem;
    padding: 6px 12px;
    line-height: 1.4;
    text-align: left;
    max-width: 100%;
    white-space: normal;
  }
  .fengshui-badge {
    font-size: 0.76rem;
    padding: 6px 12px;
    line-height: 1.45;
    text-align: left;
    max-width: 100%;
    white-space: normal;
  }
  .hero-headline {
    font-size: 1.6rem !important;
    line-height: 1.22;
    letter-spacing: 0.01em;
    word-break: break-word;
    overflow-wrap: break-word;
    margin-bottom: 18px;
  }
  .hero-bio {
    font-size: 0.95rem;
    line-height: 1.65;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
  .hero-disciplines-grid {
    grid-template-columns: 1fr;
    gap: 10px;
    padding-top: 20px;
  }
  .discipline-box {
    text-align: left;
    padding: 12px 14px;
  }
  .avatar-card {
    border-radius: var(--radius-sm);
  }
  .avatar-img {
    height: 380px;
  }
  .bento-card.span-7, .bento-card.span-5, .bento-card.span-6, .bento-card.span-4, .bento-card.span-12 {
    grid-column: span 12;
  }
  .drive-banner-card {
    flex-direction: column;
    text-align: center;
    padding: 24px 16px;
  }
  .drive-banner-content h3 {
    font-size: 1.3rem;
  }
  .case-study-card {
    padding: 24px 16px;
  }
  .case-grid-content, .case-metrics-row {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .case-steps-timeline, .toolkit-grid, .workflow-steps-grid, .slider-note-grid {
    grid-template-columns: 1fr;
  }
  .booking-form-box {
    padding: 24px 16px;
  }
  .toast-container {
    left: 16px;
    right: 16px;
    bottom: 16px;
  }
}