/* ─── CSS Custom Properties ───────────────────────────────────────────────── */
:root {
  --bg-primary:    #0a0a14;
  --bg-secondary:  #0f0f1e;
  --bg-card:       #13132a;
  --bg-glass:      rgba(255, 255, 255, 0.04);
  --bg-glass-hover:rgba(255, 255, 255, 0.08);

  --accent-purple: #7c3aed;
  --accent-blue:   #2563eb;
  --accent-cyan:   #06b6d4;
  --accent-pink:   #ec4899;

  --grad-main:  linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  --grad-text:  linear-gradient(135deg, #a78bfa, #60a5fa, #34d399);
  --grad-hero:  radial-gradient(ellipse 80% 60% at 50% 0%, rgba(124,58,237,0.18) 0%, transparent 70%),
                radial-gradient(ellipse 60% 50% at 80% 80%, rgba(37,99,235,0.12) 0%, transparent 60%);

  --text-primary: #f1f5f9;
  --text-muted:   #94a3b8;
  --text-dim:     #64748b;

  --border:       rgba(255, 255, 255, 0.07);
  --border-glow:  rgba(124, 58, 237, 0.3);

  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  32px;

  --shadow-card:  0 4px 24px rgba(0, 0, 0, 0.4), 0 1px 0 rgba(255,255,255,0.05) inset;
  --shadow-glow:  0 0 40px rgba(124, 58, 237, 0.15);

  --transition: 0.25s ease;
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);

  --container: 1200px;
  --section-gap: clamp(80px, 10vw, 140px);
}

/* ─── Reset ─────────────────────────────────────────────────────────────────── */
*, *::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: 'Inter', system-ui, -apple-system, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-image: var(--grad-hero);
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

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

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ─── Layout ─────────────────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(16px, 5vw, 48px);
}

section {
  padding: var(--section-gap) 0;
  position: relative;
}

/* ─── Typography ────────────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

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

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 16px;
}

.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  line-height: 1.7;
}

/* ─── Divider ────────────────────────────────────────────────────────────────── */
.section-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-glow), transparent);
  border: none;
  margin: 0;
}

/* ─── Scrollbar ─────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-purple); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-blue); }

/* ─── Focus Visible ─────────────────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}