/* ============================================================
   Portfolio Website - Main Stylesheet
   Premium Dark Theme | Modern & Professional
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&display=swap');

/* ============================================================
   CSS CUSTOM PROPERTIES
   ============================================================ */
:root {
  /* Colors */
  --bg-primary: #080B11;
  --bg-secondary: #0D1117;
  --bg-tertiary: #111827;
  --bg-elevated: #161D2B;
  --bg-card: #0F1620;
  
  --accent-primary: #3B82F6;
  --accent-secondary: #8B5CF6;
  --accent-tertiary: #10B981;
  --accent-glow: rgba(59, 130, 246, 0.15);
  
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #475569;
  --text-accent: #3B82F6;
  
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.15);
  
  --gradient-hero: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 50%, #10B981 100%);
  --gradient-blue: linear-gradient(135deg, #3B82F6, #6366F1);
  --gradient-purple: linear-gradient(135deg, #8B5CF6, #EC4899);
  --gradient-green: linear-gradient(135deg, #10B981, #3B82F6);
  --gradient-card: linear-gradient(135deg, rgba(59,130,246,0.05), rgba(139,92,246,0.05));
  
  /* Typography */
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  
  /* Spacing */
  --section-padding: 120px;
  --container-max: 1200px;
  --container-padding: 24px;
  
  /* Effects */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.15);
  --shadow-glow-strong: 0 0 60px rgba(59, 130, 246, 0.25);
  
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: rgba(59, 130, 246, 0.3);
  color: var(--text-primary);
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
ul, ol { list-style: none; }

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

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
.display-xl {
  font-family: var(--font-display);
  font-size: clamp(48px, 8vw, 96px);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.03em;
}

.display-lg {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.display-md {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.heading-xl {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 36px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.heading-lg {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.5vw, 28px);
  font-weight: 600;
  line-height: 1.4;
}

.body-lg { font-size: 18px; font-weight: 300; line-height: 1.7; }
.body-md { font-size: 16px; font-weight: 300; line-height: 1.7; }
.body-sm { font-size: 14px; line-height: 1.6; }
.caption { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 500; }

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--section-padding) 0;
}

.section-sm {
  padding: 80px 0;
}

/* ============================================================
   COMPONENTS: LABEL
   ============================================================ */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: 20px;
}

.section-label .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-primary);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

/* ============================================================
   COMPONENTS: BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.05);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::before { opacity: 1; }

.btn-primary {
  background: var(--gradient-blue);
  color: #fff;
  box-shadow: 0 4px 24px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.45);
}

.btn-secondary {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--accent-primary);
  border: 1px solid rgba(59, 130, 246, 0.4);
}

.btn-outline:hover {
  background: rgba(59, 130, 246, 0.08);
  border-color: var(--accent-primary);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 13px;
}

.btn-lg {
  padding: 18px 36px;
  font-size: 16px;
}

/* ============================================================
   COMPONENTS: CARDS
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

.card:hover {
  border-color: var(--border-default);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-glass {
  background: rgba(15, 22, 32, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition-slow);
}

.nav.scrolled {
  background: rgba(8, 11, 17, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 0;
}

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

.nav-logo {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-link {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

.nav-cta {
  padding: 9px 20px;
  background: var(--gradient-blue);
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition-base);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.35);
}

.nav-mobile-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}

.nav-mobile-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav-mobile {
  display: none;
  position: absolute;
  top: 100%; left: 0; right: 0;
  background: rgba(8, 11, 17, 0.98);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 20px 24px;
  flex-direction: column;
  gap: 4px;
}

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

.nav-mobile .nav-link {
  padding: 12px 14px;
  display: block;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.12;
  animation: orb-float 8s ease-in-out infinite;
}

.hero-orb-1 {
  width: 600px; height: 600px;
  background: #3B82F6;
  top: -200px; left: -100px;
  animation-delay: 0s;
}

.hero-orb-2 {
  width: 500px; height: 500px;
  background: #8B5CF6;
  top: 0; right: -150px;
  animation-delay: -3s;
}

.hero-orb-3 {
  width: 400px; height: 400px;
  background: #10B981;
  bottom: -100px; left: 30%;
  animation-delay: -5s;
}

@keyframes orb-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 6px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-full);
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 28px;
  width: fit-content;
}

.hero-badge .badge-pill {
  background: var(--gradient-blue);
  color: #fff;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(44px, 6vw, 80px);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

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

.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.7;
  max-width: 520px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.stat-item {
  background: var(--bg-card);
  padding: 20px 16px;
  text-align: center;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ============================================================
   HERO PROFILE CARD
   ============================================================ */
.hero-card {
  position: relative;
}

.profile-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 32px;
  position: relative;
  overflow: hidden;
}

.profile-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-hero);
}

.profile-card::after {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at center, rgba(59,130,246,0.04) 0%, transparent 60%);
  pointer-events: none;
}

.profile-avatar-wrap {
  position: relative;
  width: 88px; height: 88px;
  margin-bottom: 20px;
}

.profile-avatar {
  width: 88px; height: 88px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border-default);
}

.profile-avatar-placeholder {
  width: 88px; height: 88px;
  border-radius: 50%;
  background: var(--gradient-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  color: #fff;
}

.profile-status {
  position: absolute;
  bottom: 4px; right: 4px;
  width: 16px; height: 16px;
  background: var(--accent-tertiary);
  border-radius: 50%;
  border: 2px solid var(--bg-elevated);
}

.profile-status::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: var(--accent-tertiary);
  opacity: 0.3;
  animation: status-pulse 2s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { transform: scale(1); opacity: 0.3; }
  50% { transform: scale(1.4); opacity: 0; }
}

.profile-name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 4px;
}

.profile-title {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.profile-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}

.tag {
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.tag-blue { background: rgba(59,130,246,0.12); color: #60A5FA; border: 1px solid rgba(59,130,246,0.2); }
.tag-purple { background: rgba(139,92,246,0.12); color: #A78BFA; border: 1px solid rgba(139,92,246,0.2); }
.tag-green { background: rgba(16,185,129,0.12); color: #34D399; border: 1px solid rgba(16,185,129,0.2); }
.tag-orange { background: rgba(245,158,11,0.12); color: #FCD34D; border: 1px solid rgba(245,158,11,0.2); }

.profile-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 20px 0;
}

.profile-info-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.profile-info-row svg {
  width: 14px; height: 14px;
  color: var(--accent-primary);
  flex-shrink: 0;
}

.profile-social {
  display: flex;
  gap: 8px;
  margin-top: 20px;
}

.social-btn {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  color: var(--text-muted);
}

.social-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.08);
  transform: translateY(-2px);
}

.social-btn svg { width: 16px; height: 16px; }

.floating-badge {
  position: absolute;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: var(--shadow-lg);
  animation: float-badge 4s ease-in-out infinite;
}

.floating-badge-1 {
  top: -16px; right: 20px;
  animation-delay: 0s;
}

.floating-badge-2 {
  bottom: 20px; left: -20px;
  animation-delay: -2s;
}

.floating-badge .badge-icon {
  width: 28px; height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

@keyframes float-badge {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-6px); }
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
#about {
  background: var(--bg-secondary);
  position: relative;
}

#about::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-default), transparent);
}

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

.about-visual {
  position: relative;
}

.about-image-frame {
  border-radius: var(--radius-xl);
  overflow: hidden;
  position: relative;
  aspect-ratio: 4/5;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
}

.about-image-placeholder {
  width: 100%; height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-elevated), var(--bg-card));
  gap: 16px;
}

.about-image-placeholder .big-initial {
  font-family: var(--font-display);
  font-size: 120px;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  opacity: 0.3;
}

.about-image-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(8,11,17,0.9));
  padding: 32px 24px 24px;
}

.about-highlight-cards {
  position: absolute;
  right: -40px; top: 40px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.highlight-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-md);
  min-width: 200px;
}

.highlight-card .h-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.highlight-card .h-text strong {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.highlight-card .h-text span {
  font-size: 12px;
  color: var(--text-muted);
}

.about-content {}

.about-text-lead {
  font-size: 20px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.about-text-lead strong {
  color: var(--text-primary);
  font-weight: 500;
}

.about-text {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 32px 0;
}

.value-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.value-item:hover {
  border-color: rgba(59, 130, 246, 0.2);
  background: rgba(59, 130, 246, 0.03);
}

.value-icon {
  font-size: 20px;
  flex-shrink: 0;
  margin-top: 2px;
}

.value-text strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 2px;
}

.value-text span {
  font-size: 12px;
  color: var(--text-muted);
}

/* ============================================================
   BUILDING SECTION
   ============================================================ */
#building {
  position: relative;
  overflow: hidden;
}

.building-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.building-grid .building-card:first-child,
.building-grid .building-card:nth-child(2) {
  grid-column: span 1;
}

.building-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: default;
}

.building-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.building-card:nth-child(1)::before { background: var(--gradient-blue); }
.building-card:nth-child(2)::before { background: var(--gradient-purple); }
.building-card:nth-child(3)::before { background: var(--gradient-green); }
.building-card:nth-child(4)::before { background: linear-gradient(135deg, #F59E0B, #EF4444); }
.building-card:nth-child(5)::before { background: linear-gradient(135deg, #06B6D4, #3B82F6); }

.building-card:hover {
  border-color: var(--border-default);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.building-card:hover::before { opacity: 1; }

.building-icon-wrap {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 26px;
}

.building-card:nth-child(1) .building-icon-wrap { background: rgba(59,130,246,0.1); }
.building-card:nth-child(2) .building-icon-wrap { background: rgba(139,92,246,0.1); }
.building-card:nth-child(3) .building-icon-wrap { background: rgba(16,185,129,0.1); }
.building-card:nth-child(4) .building-icon-wrap { background: rgba(245,158,11,0.1); }
.building-card:nth-child(5) .building-icon-wrap { background: rgba(6,182,212,0.1); }

.building-card-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.building-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.building-card-detail {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

/* ============================================================
   SKILLS SECTION
   ============================================================ */
#skills {
  background: var(--bg-secondary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.skill-category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-base);
}

.skill-category-card:hover {
  border-color: var(--border-default);
  box-shadow: var(--shadow-md);
}

.skill-cat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.skill-cat-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(59,130,246,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.skill-cat-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}

.skill-cat-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.skill-items { display: flex; flex-direction: column; gap: 16px; }

.skill-item {}

.skill-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.skill-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.skill-level {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-primary);
}

.skill-bar-bg {
  height: 6px;
  background: rgba(255,255,255,0.05);
  border-radius: 3px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--gradient-blue);
  width: 0%;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.skill-bar-fill::after {
  content: '';
  position: absolute;
  right: 0; top: 0; bottom: 0;
  width: 20px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3));
}

/* ============================================================
   PORTFOLIO SECTION
   ============================================================ */
#portfolio {}

.portfolio-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.filter-btn {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-display);
  background: rgba(255,255,255,0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
  cursor: pointer;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

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

.project-thumbnail {
  aspect-ratio: 16/10;
  background: var(--bg-elevated);
  position: relative;
  overflow: hidden;
}

.project-thumb-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  position: relative;
}

.project-thumb-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8,11,17,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all var(--transition-base);
}

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

.project-overlay-btn {
  padding: 10px 20px;
  background: #fff;
  color: var(--bg-primary);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-display);
  display: flex;
  align-items: center;
  gap: 8px;
  transform: translateY(10px);
  transition: transform var(--transition-base);
}

.project-card:hover .project-overlay-btn { transform: translateY(0); }

.project-info { padding: 24px; }

.project-category-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(59,130,246,0.1);
  color: var(--accent-primary);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.project-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  transition: color var(--transition-fast);
}

.project-card:hover .project-title { color: var(--accent-primary); }

.project-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-techs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tech-tag {
  padding: 3px 10px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 11px;
  color: var(--text-muted);
}

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

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.service-card.featured {
  border-color: rgba(59, 130, 246, 0.3);
  background: rgba(59,130,246,0.03);
}

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

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-default);
}

.service-card.featured:hover {
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.15);
}

.service-icon-wrap {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  background: rgba(59,130,246,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 24px;
}

.service-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.service-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex: 1;
}

.service-benefits {
  margin-bottom: 28px;
}

.benefit-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  padding: 6px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.benefit-item:last-child { border-bottom: none; }

.benefit-check {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: rgba(16,185,129,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent-tertiary);
  font-size: 10px;
}

/* ============================================================
   TESTIMONIALS SECTION
   ============================================================ */
#testimonials {}

.testimonials-slider {
  position: relative;
  overflow: hidden;
}

.testimonials-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px;
  min-width: calc(50% - 12px);
  position: relative;
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.testimonial-card.active {
  border-color: rgba(59, 130, 246, 0.2);
}

.quote-mark {
  font-family: Georgia, serif;
  font-size: 80px;
  line-height: 0.6;
  color: rgba(59, 130, 246, 0.15);
  margin-bottom: 20px;
  display: block;
}

.testimonial-content {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  font-weight: 300;
  font-style: italic;
  margin-bottom: 28px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--gradient-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.author-name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
}

.author-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.testimonial-stars {
  display: flex;
  gap: 3px;
  margin-top: 4px;
  color: #FBBF24;
  font-size: 12px;
}

.slider-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
}

.slider-btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-base);
  cursor: pointer;
}

.slider-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.08);
}

.slider-dots {
  display: flex;
  gap: 6px;
}

.slider-dot {
  width: 6px; height: 6px;
  border-radius: 3px;
  background: var(--border-default);
  transition: all var(--transition-base);
  cursor: pointer;
}

.slider-dot.active {
  width: 24px;
  background: var(--accent-primary);
}

/* ============================================================
   TIMELINE SECTION
   ============================================================ */
#timeline {
  background: var(--bg-secondary);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--border-default) 10%, var(--border-default) 90%, transparent);
}

.timeline-item {
  display: flex;
  gap: 40px;
  position: relative;
  margin-bottom: 60px;
}

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

.timeline-item:nth-child(odd) {
  flex-direction: row;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-content {
  flex: 1;
  text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
  text-align: left;
}

.timeline-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.timeline-dot {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 2px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all var(--transition-base);
}

.timeline-item:hover .timeline-dot {
  border-color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 24px rgba(59, 130, 246, 0.2);
}

.timeline-item.future .timeline-dot {
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.05);
  border-style: dashed;
}

.timeline-year {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-primary);
  margin-top: 8px;
  letter-spacing: 0.05em;
}

.timeline-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ============================================================
   CONTACT SECTION
   ============================================================ */
#contact {}

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

.contact-info-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
}

.contact-info-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 40px;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 40px;
}

.contact-channel {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-base);
}

.contact-channel:hover {
  border-color: var(--border-default);
  transform: translateX(6px);
  background: rgba(59, 130, 246, 0.03);
}

.channel-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.channel-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.channel-value {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  margin-top: 2px;
}

.channel-arrow {
  margin-left: auto;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.contact-channel:hover .channel-arrow {
  color: var(--accent-primary);
  transform: translateX(4px);
}

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

.form-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}

.form-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group.full { grid-column: 1 / -1; }

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.form-input,
.form-select,
.form-textarea {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  outline: none;
  width: 100%;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.03);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.form-select option {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

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

.form-submit { width: 100%; margin-top: 8px; }

.form-message {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  margin-top: 16px;
  display: none;
}

.form-message.success {
  background: rgba(16,185,129,0.1);
  border: 1px solid rgba(16,185,129,0.2);
  color: #34D399;
  display: block;
}

.form-message.error {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.2);
  color: #FC8181;
  display: block;
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 280px;
  margin-bottom: 24px;
}

.footer-social {
  display: flex;
  gap: 8px;
}

.footer-col-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 14px;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-link:hover { color: var(--text-primary); }

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copyright {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-credits {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-credits span {
  color: #FC8181;
}

/* ============================================================
   MODAL
   ============================================================ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  max-width: 700px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(30px) scale(0.97);
  transition: all var(--transition-spring);
}

.modal-backdrop.open .modal-box {
  transform: translateY(0) scale(1);
}

.modal-header {
  padding: 28px 32px 24px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
}

.modal-close {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
  flex-shrink: 0;
  font-size: 18px;
}

.modal-close:hover {
  background: rgba(239,68,68,0.1);
  border-color: rgba(239,68,68,0.3);
  color: #FC8181;
}

.modal-body { padding: 32px; }

.modal-thumb {
  aspect-ratio: 16/9;
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  margin-bottom: 24px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
}

.modal-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.modal-meta {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.modal-meta-row {
  display: flex;
  gap: 12px;
}

.modal-meta-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  width: 100px;
  flex-shrink: 0;
}

.modal-meta-value {
  font-size: 14px;
  color: var(--text-secondary);
}

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

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in {
  opacity: 0;
  transition: opacity 0.6s ease;
}

.fade-in.visible { opacity: 1; }

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }

/* ============================================================
   UTILITIES
   ============================================================ */
.text-gradient {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-accent { color: var(--accent-primary); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }

.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mb-8 { margin-bottom: 32px; }

.section-header {
  margin-bottom: 60px;
}

.section-header-centered {
  text-align: center;
  margin-bottom: 60px;
}

.section-header-centered .section-label {
  margin: 0 auto 20px;
}

.section-subtitle {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.7;
  max-width: 600px;
  margin: 16px auto 0;
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  opacity: 0;
  transform: translateY(16px);
  z-index: 500;
  box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* ============================================================
   PAGE LOADER
   ============================================================ */
.page-loader {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-logo {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: pulse 1.5s ease-in-out infinite;
}

.loader-bar {
  width: 200px;
  height: 2px;
  background: var(--border-subtle);
  border-radius: 2px;
  overflow: hidden;
}

.loader-progress {
  height: 100%;
  background: var(--gradient-hero);
  border-radius: 2px;
  animation: loader-progress 1.2s ease forwards;
}

@keyframes loader-progress {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  :root {
    --section-padding: 80px;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
  }
  
  .hero-card { display: none; }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  
  .about-highlight-cards { display: none; }
  
  .building-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px;
    --container-padding: 20px;
  }
  
  .nav-links, .nav-cta { display: none; }
  .nav-mobile-btn { display: flex; }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .building-grid {
    grid-template-columns: 1fr;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
  
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .testimonial-card {
    min-width: 100%;
  }
  
  .timeline::before { left: 24px; }
  
  .timeline-item,
  .timeline-item:nth-child(even) {
    flex-direction: row;
    padding-left: 72px;
  }
  
  .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    text-align: left;
  }
  
  .timeline-center {
    position: absolute;
    left: 0;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .about-values { grid-template-columns: 1fr; }
  
  .form-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 36px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .modal-body { padding: 20px; }
  .modal-header { padding: 20px; }
  .modal-actions { flex-direction: column; }
  .modal-actions .btn { width: 100%; }
  .back-to-top { bottom: 20px; right: 20px; }
}