/* ==========================================================================
   NEON ART UNIVERSE — IT PORTFOLIO
   Art Direction: Crimson Red (#FF244F) × Emerald Green (#38FF91) × Obsidian Black (#07090B)
   Tagline: Where Logic Meets Imagination.
   ========================================================================== */

:root {
  /* Obsidian Base Palette */
  --bg-primary: #07090b;
  --bg-secondary: #11151a;
  --bg-card: rgba(17, 21, 26, 0.85);
  --bg-card-hover: rgba(22, 28, 36, 0.95);
  --bg-glass: rgba(13, 17, 23, 0.72);
  --bg-glass-elevated: rgba(18, 24, 32, 0.88);

  /* Neon Crimson Spectrum */
  --crimson-neon: #ff244f;
  --crimson-dark: #8c1735;
  --crimson-glow: rgba(255, 36, 79, 0.35);
  --crimson-glow-strong: rgba(255, 36, 79, 0.65);
  --crimson-subtle: rgba(255, 36, 79, 0.12);

  /* Neon Emerald Spectrum */
  --emerald-neon: #38ff91;
  --emerald-dark: #087a4a;
  --emerald-glow: rgba(56, 255, 145, 0.3);
  --emerald-glow-strong: rgba(56, 255, 145, 0.6);
  --emerald-subtle: rgba(56, 255, 145, 0.12);

  /* Typography Colors */
  --text-primary: #f4f6f8;
  --text-secondary: #a3abb5;
  --text-muted: #5e6978;
  --text-crimson: #ff476d;
  --text-emerald: #5cffaa;

  /* Borders & Dividers */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-crimson: rgba(255, 36, 79, 0.4);
  --border-emerald: rgba(56, 255, 145, 0.35);

  /* Typography: Chuẩn hóa hỗ trợ 100% tiếng Việt có dấu */
  --font-sans: 'Plus Jakarta Sans', 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Consolas', 'Courier New', monospace;
  --font-heading: 'Be Vietnam Pro', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Transitions */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-max: 1240px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: #1c2430;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--crimson-dark);
}

/* Selection */
::selection {
  background: var(--crimson-neon);
  color: #ffffff;
}

/* Accessibility Focus States */
:focus-visible {
  outline: 2px solid var(--emerald-neon);
  outline-offset: 3px;
}

/* Canvas Particle Background */
#cyber-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.65;
}

/* Custom Neon Cursor */
.custom-cursor {
  position: fixed;
  width: 28px;
  height: 28px;
  border: 1.5px solid var(--emerald-neon);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  transition: width 0.2s, height 0.2s, border-color 0.2s, background 0.2s;
  z-index: 9999;
  display: none;
  mix-blend-mode: screen;
}
.custom-cursor-dot {
  position: fixed;
  width: 6px;
  height: 6px;
  background: var(--crimson-neon);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 10000;
  display: none;
  box-shadow: 0 0 8px var(--crimson-neon);
}
@media (hover: hover) and (pointer: fine) {
  .custom-cursor, .custom-cursor-dot {
    display: block;
  }
}

/* Containers */
.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* Section Common Layout */
section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  margin-bottom: 56px;
}
.section-meta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--emerald-neon);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.section-meta::before {
  content: '◈';
  color: var(--crimson-neon);
}
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.2px;
  color: var(--text-primary);
  line-height: 1.3;
}
.section-title span.accent-crimson {
  color: var(--crimson-neon);
  text-shadow: 0 0 20px var(--crimson-glow);
}
.section-title span.accent-emerald {
  color: var(--emerald-neon);
  text-shadow: 0 0 20px var(--emerald-glow);
}
.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-top: 12px;
  max-width: 650px;
}

/* Glass Panels & Cyber Cards */
.cyber-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
}
.cyber-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 36, 79, 0.4), rgba(56, 255, 145, 0.4), transparent);
  opacity: 0.4;
  transition: opacity var(--transition-normal);
}
.cyber-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-medium);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}
.cyber-card:hover::before {
  opacity: 1;
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(7, 9, 11, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background var(--transition-normal), border-color var(--transition-normal);
}
.site-nav.scrolled {
  background: rgba(7, 9, 11, 0.95);
  border-color: rgba(56, 255, 145, 0.2);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Logo & Emblem */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}
.nav-brand-emblem {
  position: relative;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-brand-emblem svg {
  width: 100%;
  height: 100%;
  color: var(--crimson-neon);
  filter: drop-shadow(0 0 6px var(--crimson-glow));
}
.nav-brand-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 1px;
}
.nav-brand-text span {
  color: var(--emerald-neon);
}

/* Navigation Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}
.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  position: relative;
  padding: 6px 0;
  transition: color var(--transition-fast);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--emerald-neon);
  box-shadow: 0 0 8px var(--emerald-neon);
  transition: width var(--transition-normal);
}
.nav-link:hover {
  color: var(--text-primary);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}
.nav-link.active {
  color: var(--emerald-neon);
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Status Indicator */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  background: rgba(56, 255, 145, 0.08);
  border: 1px solid rgba(56, 255, 145, 0.3);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--emerald-neon);
  letter-spacing: 1px;
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--emerald-neon);
  box-shadow: 0 0 8px var(--emerald-neon);
}

/* Sound Button */
.audio-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.audio-toggle-btn:hover {
  border-color: var(--crimson-neon);
  color: var(--crimson-neon);
}
.audio-toggle-btn.active {
  border-color: var(--emerald-neon);
  color: var(--emerald-neon);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 8px;
  border-radius: 6px;
  cursor: pointer;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-decoration: none;
  padding: 12px 26px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  border: 1px solid transparent;
}
.btn-crimson {
  background: var(--crimson-neon);
  color: #ffffff;
  box-shadow: 0 0 16px var(--crimson-glow);
}
.btn-crimson:hover {
  background: #ff3b61;
  box-shadow: 0 0 28px var(--crimson-glow-strong);
  transform: translateY(-2px);
}
.btn-emerald {
  background: var(--emerald-neon);
  color: #07090b;
  font-weight: 700;
  box-shadow: 0 0 16px var(--emerald-glow);
}
.btn-emerald:hover {
  background: #50ffa0;
  box-shadow: 0 0 28px var(--emerald-glow-strong);
  transform: translateY(-2px);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border-color: var(--border-medium);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--emerald-neon);
  color: var(--emerald-neon);
  transform: translateY(-2px);
}
.btn-sm {
  padding: 8px 16px;
  font-size: 0.78rem;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-telemetry {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}
.hero-telemetry-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--emerald-neon);
  background: rgba(56, 255, 145, 0.06);
  border: 1px solid rgba(56, 255, 145, 0.25);
  padding: 4px 10px;
  border-radius: 4px;
}
.hero-telemetry-badge.accent {
  color: var(--crimson-neon);
  background: rgba(255, 36, 79, 0.06);
  border-color: rgba(255, 36, 79, 0.25);
}

.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.5px;
  padding-top: 6px;
  padding-bottom: 2px;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #ffffff 40%, var(--emerald-neon) 95%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-role {
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--crimson-neon);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-tagline {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 580px;
  line-height: 1.6;
  margin-bottom: 36px;
  border-left: 2px solid var(--crimson-neon);
  padding-left: 16px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 40px;
}

.hero-specs-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}
.spec-item-num {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--emerald-neon);
  line-height: 1;
  margin-bottom: 4px;
}
.spec-item-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Hero Centerpiece Visual */
.hero-visual-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-visual-core {
  position: relative;
  width: 100%;
  max-width: 440px;
  aspect-ratio: 1;
}

/* SVG Mechanical Core Graphics */
.core-gear-outer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  animation: gearRotateClockwise 45s linear infinite;
  transform-origin: center;
}
.core-gear-inner {
  position: absolute;
  inset: 15%;
  width: 70%;
  height: 70%;
  animation: gearRotateCounter 30s linear infinite;
  transform-origin: center;
}
.core-inner-circuit {
  position: absolute;
  inset: 28%;
  width: 44%;
  height: 44%;
  background: radial-gradient(circle, rgba(255, 36, 79, 0.25) 0%, rgba(13, 17, 23, 0.95) 70%);
  border: 2px solid var(--crimson-neon);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 35px var(--crimson-glow);
  z-index: 2;
}
.core-inner-circuit span.core-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--emerald-neon);
  letter-spacing: 2px;
}
.core-inner-circuit span.core-symbol {
  font-size: 1.7rem;
  color: var(--text-primary);
  margin: 2px 0;
}

/* ==========================================================================
   ABOUT SECTION
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: center;
}

.about-portrait-card {
  padding: 24px;
  text-align: center;
}
.about-avatar-frame {
  position: relative;
  width: 100%;
  max-width: 320px;
  margin: 0 auto 20px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(56, 255, 145, 0.35);
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.6);
}
.about-avatar-frame img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}
.about-avatar-frame:hover img {
  transform: scale(1.03);
}

.about-hud-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-around;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}
.about-hud-meta span {
  color: var(--emerald-neon);
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.about-quote {
  padding: 16px 20px;
  background: rgba(255, 36, 79, 0.05);
  border-left: 3px solid var(--crimson-neon);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--text-primary);
  margin-bottom: 32px;
}

.about-highlights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 36px;
}
.highlight-item {
  padding: 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
}
.highlight-item-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.highlight-icon {
  color: var(--crimson-neon);
}
.highlight-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}
.highlight-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   SKILLS SECTION (CORE SYSTEMS)
   ========================================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.skill-card {
  padding: 28px;
}
.skill-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}
.skill-category-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.skill-category-title svg {
  width: 22px;
  height: 22px;
  color: var(--emerald-neon);
}
.skill-category-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.skill-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.skill-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.04);
  transition: all var(--transition-fast);
}
.skill-item:hover {
  background: rgba(56, 255, 145, 0.05);
  border-color: rgba(56, 255, 145, 0.25);
  transform: translateX(4px);
}
.skill-name {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-primary);
}
.skill-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.badge-used {
  background: rgba(56, 255, 145, 0.12);
  color: var(--emerald-neon);
  border: 1px solid rgba(56, 255, 145, 0.3);
}
.badge-practiced {
  background: rgba(255, 36, 79, 0.12);
  color: var(--crimson-neon);
  border: 1px solid rgba(255, 36, 79, 0.3);
}
.badge-learning {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

/* ==========================================================================
   PROJECTS SECTION (ARTIFACTS FROM MY LAB)
   ========================================================================== */
.projects-filter-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}
.filter-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 8px 18px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}
.filter-btn.active {
  background: rgba(56, 255, 145, 0.12);
  border-color: var(--emerald-neon);
  color: var(--emerald-neon);
  box-shadow: 0 0 12px var(--emerald-glow);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 32px;
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.project-card-image-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #080b0f;
  border-bottom: 1px solid var(--border-subtle);
}
.project-card-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.project-card:hover .project-card-image-wrap img {
  transform: scale(1.05);
}
.project-category-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 10px;
  background: rgba(7, 9, 11, 0.85);
  border: 1px solid var(--emerald-neon);
  color: var(--emerald-neon);
  border-radius: 4px;
  backdrop-filter: blur(8px);
}

.project-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.project-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.project-role-tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--crimson-neon);
  margin-bottom: 12px;
}
.project-description {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.project-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.tech-chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  padding: 3px 8px;
  border-radius: 4px;
}

.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

/* ==========================================================================
   PROCESS SECTION (FROM SKETCH TO SYSTEM)
   ========================================================================== */
.process-timeline {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
  position: relative;
  margin-top: 40px;
}
.process-timeline::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 5%;
  right: 5%;
  height: 2px;
  background: linear-gradient(90deg, var(--crimson-neon), var(--emerald-neon));
  opacity: 0.35;
  z-index: 0;
}

.process-step-card {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 24px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  transition: all var(--transition-normal);
}
.process-step-card:hover {
  border-color: var(--emerald-neon);
  transform: translateY(-6px);
  box-shadow: 0 10px 24px rgba(56, 255, 145, 0.15);
}
.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--emerald-neon);
  color: var(--emerald-neon);
  font-family: var(--font-mono);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 0 12px var(--emerald-glow);
}
.step-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.step-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
}
.step-tools {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--crimson-neon);
}

/* ==========================================================================
   ART GALLERY SECTION (WHERE CODE BECOMES ART)
   ========================================================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}

.gallery-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  background: #06080b;
  cursor: pointer;
  transition: all var(--transition-normal);
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.gallery-item:hover {
  border-color: var(--crimson-neon);
  box-shadow: 0 12px 30px var(--crimson-glow);
  transform: translateY(-4px);
}
.gallery-item:hover img {
  transform: scale(1.06);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(7, 9, 11, 0.95) 0%, rgba(7, 9, 11, 0.2) 60%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
  opacity: 0;
  transition: opacity var(--transition-normal);
}
.gallery-item:hover .gallery-overlay {
  opacity: 1;
}
.gallery-art-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.gallery-art-desc {
  font-size: 0.82rem;
  color: var(--emerald-neon);
  font-family: var(--font-mono);
}

/* ==========================================================================
   CONTACT SECTION (OPEN A CONNECTION)
   ========================================================================== */
.contact-section {
  position: relative;
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 56px;
  align-items: flex-start;
}

.contact-info-card {
  padding: 36px;
}
.contact-prompt {
  font-size: 1.15rem;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 32px;
}

.contact-method-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 36px;
}
.contact-method-item {
  display: flex;
  align-items: center;
  gap: 16px;
}
.contact-method-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: rgba(255, 36, 79, 0.08);
  border: 1px solid rgba(255, 36, 79, 0.25);
  color: var(--crimson-neon);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-method-details span.label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
}
.contact-method-details a,
.contact-method-details p {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.contact-method-details a:hover {
  color: var(--emerald-neon);
}

.contact-form-card {
  padding: 36px;
}
.form-group {
  margin-bottom: 22px;
}
.form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}
.form-input,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(7, 9, 11, 0.6);
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}
.form-input:focus,
.form-textarea:focus {
  border-color: var(--emerald-neon);
  box-shadow: 0 0 12px var(--emerald-glow);
  outline: none;
}
.form-textarea {
  resize: vertical;
  min-height: 130px;
}
.form-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  padding: 50px 0 30px;
  border-top: 1px solid var(--border-subtle);
  background: #050709;
}
.footer-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.footer-telemetry {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
}
.telemetry-item span {
  color: var(--emerald-neon);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}
.back-to-top-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.back-to-top-btn:hover {
  border-color: var(--crimson-neon);
  color: var(--crimson-neon);
}

/* ==========================================================================
   MODAL WINDOWS (Project Case Study & Lightbox)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 7, 9, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}
.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: 14px;
  width: 100%;
  max-width: 840px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}
.modal-overlay.active .modal-dialog {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition-fast);
}
.modal-close-btn:hover {
  background: var(--crimson-neon);
  color: #fff;
  border-color: var(--crimson-neon);
}

.modal-header-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 380px;
  overflow: hidden;
  background: #080b0f;
  border-bottom: 1px solid var(--border-subtle);
}
.modal-header-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.modal-body {
  padding: 32px;
}
.modal-title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.modal-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--emerald-neon);
}

/* Lightbox Specific */
.lightbox-dialog {
  max-width: 900px;
  background: transparent;
  border: none;
  box-shadow: none;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.lightbox-img-wrap {
  width: 100%;
  max-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.lightbox-img-wrap img {
  max-width: 100%;
  max-height: 70vh;
  border-radius: 8px;
  border: 1px solid var(--border-crimson);
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.9);
}
.lightbox-info {
  margin-top: 16px;
  text-align: center;
  color: var(--text-primary);
}
.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(13, 17, 23, 0.85);
  border: 1px solid var(--border-medium);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.lightbox-nav:hover {
  border-color: var(--emerald-neon);
  color: var(--emerald-neon);
}
.lightbox-prev { left: -60px; }
.lightbox-next { right: -60px; }

/* ==========================================================================
   RESPONSIVE DESIGN (Tablets & Mobile)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: left;
    gap: 40px;
  }
  .hero-visual-wrapper {
    margin: 0 auto;
    max-width: 360px;
  }
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .process-timeline {
    grid-template-columns: repeat(3, 1fr);
  }
  .process-timeline::before {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  section {
    padding: 70px 0;
  }
  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: rgba(7, 9, 11, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 24px;
    padding: 30px;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
  }
  .nav-links.open {
    transform: translateX(0);
  }
  .mobile-toggle {
    display: block;
  }
  .status-pill {
    display: none;
  }
  .hero-specs-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .process-timeline {
    grid-template-columns: 1fr;
  }
  .projects-grid,
  .gallery-grid {
    grid-template-columns: 1fr;
  }
  .lightbox-prev { left: 10px; }
  .lightbox-next { right: 10px; }
}