global.css

/* ═══════════════════════════════════════════════════════════════════════════
   GLOBAL.CSS — APEX PRO v2.0 — Gokul R Portfolio
   Sleek · Modern · Professional · Subtle Elegance
   ═══════════════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ─────────────────────────────────────────────────────────────
   DARK THEME (default) — Midnight Indigo
───────────────────────────────────────────────────────────── */
:root,
[data-theme='dark'] {
  /* ── Backgrounds ── */
  --bg:            #08080f;
  --bg-deep:       #04040a;
  --bg-card:       rgba(18, 18, 34, 0.88);
  --bg-glass:      rgba(99, 102, 241, 0.06);
  --bg-glass-2:    rgba(6, 182, 212, 0.04);

  /* ── Borders ── */
  --border:        rgba(99, 102, 241, 0.12);
  --border-hot:    rgba(6, 182, 212, 0.4);
  --border-fire:   rgba(236, 72, 153, 0.35);

  /* ── Text ── */
  --text-primary:  #f0eff5;
  --text-secondary:#9896ad;
  --text-muted:    #605e78;

  /* ── Accents ── */
  --accent:        #6366f1;
  --accent-2:      #06b6d4;
  --accent-warm:   #f59e0b;
  --accent-green:  #10b981;
  --accent-pink:   #ec4899;
  --accent-glow:   rgba(99, 102, 241, 0.1);

  /* ── Gradients ── */
  --grad-main:     linear-gradient(135deg, #6366f1 0%, #06b6d4 50%, #10b981 100%);
  --grad-fire:     linear-gradient(135deg, #ec4899 0%, #f59e0b 50%, #facc15 100%);
  --grad-aurora:   linear-gradient(135deg, #06b6d4 0%, #6366f1 40%, #ec4899 100%);
  --grad-ice:      linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  --grad-galaxy:   linear-gradient(135deg, #6366f1 0%, #06b6d4 30%, #8b5cf6 60%, #ec4899 100%);
  --grad-quantum:  linear-gradient(135deg, #06b6d4 0%, #6366f1 25%, #ec4899 50%, #f59e0b 75%, #10b981 100%);

  /* ── Shadows ── */
  --shadow-sm:     0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md:     0 4px 20px rgba(0, 0, 0, 0.35);
  --shadow-lg:     0 10px 40px rgba(0, 0, 0, 0.4);
  --shadow-xl:     0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-accent: 0 4px 24px rgba(99, 102, 241, 0.25);
  --shadow-cyan:   0 4px 24px rgba(6, 182, 212, 0.2);
  --shadow-card:   0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow:   0 0 30px rgba(99, 102, 241, 0.12);

  /* ── System ── */
  --nav-bg:        rgba(8, 8, 15, 0.94);
  --input-bg:      rgba(99, 102, 241, 0.06);
  --input-border:  rgba(99, 102, 241, 0.18);
  --footer-bg:     #04040a;
  --grid-color:    rgba(99, 102, 241, 0.035);
  --noise-opacity: 0.25;
  --orb-opacity:   0.35;

  /* ── Cursor Vars ── */
  --cursor-dot-color:      #6366f1;
  --cursor-dot-size:       6px;
  --cursor-ring-color:     rgba(99, 102, 241, 0.5);
  --cursor-ring-expand:    rgba(6, 182, 212, 0.7);
  --cursor-trail-color:    rgba(99, 102, 241, 0.08);
  --cursor-glow:           0 0 8px #6366f1;
  --cursor-ring-glow:      0 0 12px rgba(99, 102, 241, 0.2);
  --cursor-expand-glow:    0 0 20px rgba(6, 182, 212, 0.35);
  --cursor-trail-glow:     0 0 6px rgba(99, 102, 241, 0.15);
  --cursor-particle-color: #6366f1;
  --cursor-blend:          screen;
  --cursor-ring-border:    1.5px solid rgba(99, 102, 241, 0.5);
  --cursor-ring-expand-border: 1.5px solid rgba(6, 182, 212, 0.7);

  /* ── Toggle ── */
  --toggle-border:     rgba(99, 102, 241, 0.3);
  --toggle-bg:         rgba(99, 102, 241, 0.1);
  --toggle-glow:       0 0 16px rgba(99, 102, 241, 0.2);
}
/* ─────────────────────────────────────────────────────────────
   LIGHT THEME — Crystal Frost
───────────────────────────────────────────────────────────── */
[data-theme='light'] {
  /* ── Backgrounds ── */
  --bg:            #f5f6fa;
  --bg-deep:       #eef0f6;
  --bg-card:       rgba(255, 255, 255, 0.94);
  --bg-glass:      rgba(99, 102, 241, 0.06);
  --bg-glass-2:    rgba(255, 255, 255, 0.94);

  /* ── Borders ── */
  --border:        rgba(99, 102, 241, 0.14);
  --border-hot:    rgba(6, 182, 212, 0.45);
  --border-fire:   rgba(236, 72, 153, 0.35);

  /* ── Text ── */
  --text-primary:  #1a1a2e;
  --text-secondary:#4a4a66;
  --text-muted:    #8a8aa6;

  /* ── Accents ── */
  --accent:        #6366f1;
  --accent-2:      #0891b2;
  --accent-warm:   #d97706;
  --accent-green:  #059669;
  --accent-pink:   #db2777;
  --accent-glow:   rgba(99, 102, 241, 0.08);

  /* ── Gradients ── */
  --grad-main:     linear-gradient(135deg, #6366f1 0%, #0891b2 50%, #059669 100%);
  --grad-fire:     linear-gradient(135deg, #db2777 0%, #d97706 50%, #ca8a04 100%);
  --grad-aurora:   linear-gradient(135deg, #0891b2 0%, #6366f1 40%, #db2777 100%);
  --grad-ice:      linear-gradient(135deg, #3b82f6 0%, #0891b2 100%);
  --grad-galaxy:   linear-gradient(135deg, #6366f1 0%, #0891b2 30%, #7c3aed 60%, #db2777 100%);
  --grad-quantum:  linear-gradient(135deg, #0891b2 0%, #6366f1 25%, #db2777 50%, #d97706 75%, #059669 100%);

  /* ── Shadows ── */
  --shadow-sm:     0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md:     0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg:     0 10px 32px rgba(0, 0, 0, 0.1);
  --shadow-xl:     0 20px 48px rgba(0, 0, 0, 0.12);
  --shadow-accent: 0 4px 20px rgba(99, 102, 241, 0.15);
  --shadow-cyan:   0 4px 20px rgba(6, 182, 212, 0.12);
  --shadow-card:   0 8px 28px rgba(99, 102, 241, 0.1);
  --shadow-glow:   0 0 20px rgba(99, 102, 241, 0.06);

  /* ── System ── */
  --nav-bg:        rgba(245, 246, 250, 0.96);
  --input-bg:      rgba(99, 102, 241, 0.04);
  --input-border:  rgba(99, 102, 241, 0.16);
  --footer-bg:     #eef0f6;
  --grid-color:    rgba(99, 102, 241, 0.04);
  --noise-opacity: 0.06;
  --orb-opacity:   0.2;

  /* ── Cursor Vars ── */
  --cursor-dot-color:      #6366f1;
  --cursor-dot-size:       6px;
  --cursor-ring-color:     rgba(99, 102, 241, 0.6);
  --cursor-ring-expand:    rgba(6, 182, 212, 0.8);
  --cursor-trail-color:    rgba(99, 102, 241, 0.06);
  --cursor-glow:           0 0 8px rgba(99, 102, 241, 0.4);
  --cursor-ring-glow:      0 0 12px rgba(99, 102, 241, 0.2);
  --cursor-expand-glow:    0 0 20px rgba(6, 182, 212, 0.25);
  --cursor-trail-glow:     0 0 6px rgba(99, 102, 241, 0.1);
  --cursor-particle-color: #6366f1;
  --cursor-blend:          multiply;
  --cursor-ring-border:    1.5px solid rgba(99, 102, 241, 0.6);
  --cursor-ring-expand-border: 1.5px solid rgba(6, 182, 212, 0.8);

  /* ── Toggle ── */
  --toggle-border:     rgba(99, 102, 241, 0.3);
  --toggle-bg:         rgba(99, 102, 241, 0.08);
  --toggle-glow:       0 0 16px rgba(99, 102, 241, 0.12);
}

/* ─────────────────────────────────────────────────────────────
   DESIGN TOKENS
───────────────────────────────────────────────────────────── */
:root {
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-code:    'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;

  --ease:        cubic-bezier(0.4, 0, 0.2, 1);
  --ease-back:   cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-expo:   cubic-bezier(0.19, 1, 0.22, 1);
  --ease-spring: cubic-bezier(0.22, 1.5, 0.36, 1);
  --t:           0.35s;

  --max-width: 1200px;

  /* ── Typography Scale ── */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background 0.6s cubic-bezier(0.4, 0, 0.2, 1),
    color 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Headings ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* ── Code ── */
code, pre {
  font-family: var(--font-code);
}

/* ─────────────────────────────────────────────────────────────
   THEME TRANSITION
───────────────────────────────────────────────────────────── */
body.theme-transitioning::after {
  content: '';
  position: fixed; inset: 0; z-index: 99997;
  pointer-events: none;
  background: radial-gradient(
    circle at var(--ripple-x, 50%) var(--ripple-y, 50%),
    rgba(99, 102, 241, 0.12) 0%,
    rgba(6, 182, 212, 0.06) 30%,
    transparent 70%
  );
  animation: themeRipple 0.6s cubic-bezier(0.19, 1, 0.22, 1) forwards;
}
[data-theme='light'] body.theme-transitioning::after {
  background: radial-gradient(
    circle at var(--ripple-x, 50%) var(--ripple-y, 50%),
    rgba(99, 102, 241, 0.1) 0%,
    rgba(6, 182, 212, 0.05) 30%,
    transparent 70%
  );
}
@keyframes themeRipple {
  0%   { transform: scale(0); opacity: 0.8; }
  60%  { transform: scale(3); opacity: 0.4; }
  100% { transform: scale(6); opacity: 0; }
}

/* ─────────────────────────────────────────────────────────────
   SCROLLBAR
───────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

::selection {
  background: rgba(99, 102, 241, 0.25);
  color: var(--text-primary);
}
[data-theme='light'] ::selection {
  background: rgba(99, 102, 241, 0.15);
  color: var(--text-primary);
}

/* ─────────────────────────────────────────────────────────────
   SUBTLE NOISE TEXTURE
───────────────────────────────────────────────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none; z-index: 0;
  opacity: var(--noise-opacity);
  mix-blend-mode: soft-light;
  transition: opacity 0.6s ease;
}

/* ─────────────────────────────────────────────────────────────
   AMBIENT GRADIENT ORBS (toned down)
───────────────────────────────────────────────────────────── */
.orb {
  position: fixed; border-radius: 50%;
  filter: blur(120px);
  pointer-events: none; z-index: 0;
  opacity: var(--orb-opacity);
  transition: opacity 0.8s ease, background 0.8s ease;
}
.orb-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, rgba(6, 182, 212, 0.05) 50%, transparent 70%);
  top: -250px; left: -250px;
  animation: orbDrift1 25s ease-in-out infinite;
}
.orb-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.08) 0%, rgba(99, 102, 241, 0.05) 50%, transparent 70%);
  bottom: -200px; right: -200px;
  animation: orbDrift2 30s ease-in-out infinite;
}
[data-theme='light'] .orb-1 {
  background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, rgba(6, 182, 212, 0.03) 50%, transparent 70%);
}
[data-theme='light'] .orb-2 {
  background: radial-gradient(circle, rgba(236, 72, 153, 0.05) 0%, rgba(99, 102, 241, 0.03) 50%, transparent 70%);
}
@keyframes orbDrift1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(50px, 40px) scale(1.05); }
  66%      { transform: translate(-30px, 60px) scale(0.95); }
}
@keyframes orbDrift2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(-50px, -40px) scale(1.05); }
  66%      { transform: translate(30px, -60px) scale(0.95); }
}

/* ─────────────────────────────────────────────────────────────
   LAYOUT
───────────────────────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
  position: relative; z-index: 1;
}

section {
  padding: 120px 0;
  position: relative;
  z-index: 1;
}

/* ─────────────────────────────────────────────────────────────
   SECTION LABEL
───────────────────────────────────────────────────────────── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  transition: color 0.6s ease;
}

.section-label::before {
  content: '';
  height: 1.5px;
  width: 32px;
  background: var(--grad-main);
  border-radius: 2px;
  transition: width 0.3s var(--ease);
}

.section-label::after {
  content: '';
  height: 1.5px;
  width: 16px;
  background: var(--grad-main);
  border-radius: 2px;
  opacity: 0.5;
  transition: width 0.3s var(--ease);
}

.section-label:hover::before {
  width: 40px;
}
.section-label:hover::after {
  width: 22px;
}

/* ─────────────────────────────────────────────────────────────
   SECTION TITLE
───────────────────────────────────────────────────────────── */
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 800;
  line-height: 1.08;
  color: var(--text-primary);
  margin-bottom: 56px;
  letter-spacing: -0.03em;
  transition: color 0.6s ease;
}

.section-title span {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradShift 6s ease-in-out infinite;
}

@keyframes gradShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ─────────────────────────────────────────────────────────────
   GLASS CARD — Modern Glassmorphism
───────────────────────────────────────────────────────────── */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  position: relative;
  overflow: hidden;
  transition:
    border-color    0.35s var(--ease),
    box-shadow      0.35s var(--ease),
    transform       0.35s var(--ease-back),
    background      0.6s var(--ease),
    backdrop-filter 0.6s var(--ease);
  will-change: transform, box-shadow;
}

/* Inner subtle gradient overlay */
.glass-card::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.04) 0%, transparent 50%, rgba(99, 102, 241, 0.03) 100%);
  transition: background 0.6s ease;
}
[data-theme='light'] .glass-card::before {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.4) 50%, rgba(99, 102, 241, 0.02) 100%);
}

/* Hover sheen sweep */
.glass-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
  transition: left 0.6s var(--ease-expo);
  pointer-events: none;
}
.glass-card:hover::after { left: 150%; }

.glass-card:hover {
  border-color: rgba(99, 102, 241, 0.35);
  box-shadow: var(--shadow-card), var(--shadow-glow), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  transform: translateY(-5px);
}
[data-theme='light'] .glass-card {
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-card);
}
[data-theme='light'] .glass-card:hover {
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

/* ─────────────────────────────────────────────────────────────
   BUTTONS — Professional & Polished
───────────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  background: var(--grad-main);
  background-size: 200% 200%;
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition:
    box-shadow 0.3s var(--ease),
    transform  0.3s var(--ease-back),
    background 0.6s ease;
  box-shadow: var(--shadow-accent);
  will-change: transform;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.2) 50%, transparent 100%);
  transform: translateX(-100%) skewX(-20deg);
  transition: transform 0.5s var(--ease-expo);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.35);
}
.btn-primary:hover::before { transform: translateX(160%) skewX(-20deg); }
.btn-primary:active { transform: translateY(-1px); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-xl);
  cursor: pointer;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition:
    all 0.3s var(--ease-back),
    color 0.6s ease;
}

.btn-outline::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-main);
  opacity: 0;
  transition: opacity 0.3s;
}
.btn-outline:hover {
  border-color: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-accent);
  transform: translateY(-2px);
}
.btn-outline:hover::before { opacity: 1; }
.btn-outline:hover > * { position: relative; z-index: 1; }
[data-theme='light'] .btn-outline:hover { color: #fff; }

/* ─────────────────────────────────────────────────────────────
   SKILL TAGS
───────────────────────────────────────────────────────────── */
.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: 100px;
  cursor: default;
  transition:
    all 0.3s var(--ease-back),
    color 0.3s,
    background 0.3s;
  position: relative;
  overflow: hidden;
  will-change: transform;
}

.skill-tag:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.3);
  color: var(--accent);
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.12);
}

.skill-tag img {
  width: 18px;
  height: 18px;
  object-fit: contain;
  filter: saturate(0.8);
  transition: filter 0.3s, transform 0.3s;
}
.skill-tag:hover img {
  filter: saturate(1);
  transform: scale(1.1);
}

/* ─────────────────────────────────────────────────────────────
   FADE IN ANIMATIONS
───────────────────────────────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  animation: revealUp 0.7s var(--ease-expo) forwards;
}

@keyframes revealUp {
  to { opacity: 1; transform: translateY(0); }
}

.delay-1 { animation-delay: 0.10s; }
.delay-2 { animation-delay: 0.20s; }
.delay-3 { animation-delay: 0.30s; }
.delay-4 { animation-delay: 0.40s; }
.delay-5 { animation-delay: 0.50s; }
.delay-6 { animation-delay: 0.65s; }

/* ─────────────────────────────────────────────────────────────
   SPINNER
───────────────────────────────────────────────────────────── */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(99, 102, 241, 0.12);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ─────────────────────────────────────────────────────────────
   BACK TO TOP
───────────────────────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 800;
  width: 48px;
  height: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px) scale(0.9);
  pointer-events: none;
  transition:
    opacity   0.35s var(--ease),
    transform 0.35s var(--ease-spring),
    box-shadow 0.3s,
    background 0.3s,
    color 0.3s,
    border-color 0.3s;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.back-to-top.show {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
  box-shadow: var(--shadow-md);
}

.back-to-top:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-accent);
}

.back-to-top:active {
  transform: translateY(-1px) scale(1.02);
}

/* ─────────────────────────────────────────────────────────────
   FORMS
───────────────────────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 0.6s ease;
}

.form-input {
  width: 100%;
  padding: 14px 18px;
  background: var(--input-bg);
  border: 1.5px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  outline: none;
  resize: none;
  transition:
    border-color 0.25s,
    background   0.6s,
    box-shadow   0.25s,
    color        0.6s;
}

.form-input::placeholder {
  color: var(--text-muted);
  font-size: var(--text-sm);
}

.form-input:focus {
  border-color: var(--accent);
  background: var(--bg-glass);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.08);
}
[data-theme='light'] .form-input:focus {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.02);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.06);
}

.form-textarea {
  min-height: 130px;
  line-height: 1.7;
}

.form-error {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(239, 68, 68, 0.06);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #ef4444;
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.form-submit {
  width: 100%;
  justify-content: center;
  padding: 16px;
  font-size: var(--text-sm);
}

.form-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ─────────────────────────────────────────────────────────────
   SECTION AURORA SEPARATOR
───────────────────────────────────────────────────────────── */
.section-aurora-sep {
  width: 100%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(99, 102, 241, 0.2) 15%,
    rgba(6, 182, 212, 0.35) 40%,
    rgba(16, 185, 129, 0.35) 60%,
    rgba(99, 102, 241, 0.2) 85%,
    transparent 100%
  );
  opacity: 0.7;
  transition: background 0.6s ease, opacity 0.6s ease;
}

[data-theme='light'] .section-aurora-sep {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(99, 102, 241, 0.12) 15%,
    rgba(6, 182, 212, 0.25) 40%,
    rgba(5, 150, 105, 0.25) 60%,
    rgba(99, 102, 241, 0.12) 85%,
    transparent 100%
  );
}

/* ─────────────────────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  section { padding: 96px 0; }
  .container { padding: 0 24px; }
}

@media (max-width: 768px) {
  section { padding: 72px 0; }
  .container { padding: 0 18px; }
  .section-title { margin-bottom: 40px; font-size: clamp(26px, 6vw, 36px); }
  .back-to-top { bottom: 20px; right: 18px; width: 44px; height: 44px; font-size: 18px; }
}

@media (max-width: 480px) {
  section { padding: 56px 0; }
  .container { padding: 0 16px; }
  .section-title { margin-bottom: 32px; }
  .btn-primary, .btn-outline { padding: 12px 22px; font-size: var(--text-xs); }
  .glass-card { border-radius: var(--radius-md); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}