/* ═══════════════════════════════════════════════════
   BASE — Reset, Typography, Utilities
   ═══════════════════════════════════════════════════ */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  overflow-x: hidden;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-in-out);
}

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

ul, ol {
  list-style: none;
}

::selection {
  background: rgba(128, 209, 186, 0.25);
  color: var(--text-primary);
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ─── Layout ─── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container--wide {
  max-width: var(--container-wide);
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* ─── Section Headers ─── */
.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--mint-300);
  background: rgba(128, 209, 186, 0.08);
  border: 1px solid rgba(128, 209, 186, 0.15);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.section-title {
  font-size: clamp(var(--text-4xl), 5vw, var(--text-6xl));
  font-weight: 800;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-6);
}

.section-subtitle {
  font-size: clamp(var(--text-lg), 2vw, var(--text-xl));
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 600px;
  margin: 0 auto;
}

/* ─── Gradient Text ─── */
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-xl);
  transition: all var(--duration-base) var(--ease-out-quart);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  border-radius: var(--radius-lg);
}

.btn--md {
  padding: var(--space-3) var(--space-6);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

.btn--primary {
  background: var(--gradient-brand);
  color: white;
  border: none;
  box-shadow: 0 2px 12px rgba(61, 155, 143, 0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 24px rgba(61, 155, 143, 0.45);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
  backdrop-filter: blur(8px);
}

.btn--ghost:hover {
  background: var(--bg-glass-hover);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

/* ─── Cursor Glow ─── */
.cursor-glow {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(128, 209, 186, 0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s;
  opacity: 0;
}

.cursor-glow--visible {
  opacity: 1;
}

@media (hover: none) {
  .cursor-glow { display: none; }
}