/* ============================================================
   Global Reset + Base Styles
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ── Scroll Progress Bar ────────────────────────────────────── */
#scroll-progress {
  position: fixed;
  top: 0; left: 0;
  width: 0%;
  height: 3px;
  background: var(--accent);
  z-index: 9999;
  transition: width 0.1s linear;
  box-shadow: 0 0 10px var(--accent-glow);
}

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

/* ── Typography ─────────────────────────────────────────────── */
h1,h2,h3,h4,h5,h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-heading);
  letter-spacing: -0.025em;
}
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.15rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
p  { color: var(--text-secondary); line-height: 1.75; }
a  { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ── Layout ─────────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.container--narrow { max-width: 860px; }

.section {
  padding: 5rem 0;
}
@media (max-width: 768px) {
  .section { padding: 3rem 0; }
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.section-title {
  margin-bottom: 0.75rem;
  color: var(--text-heading);
}
.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 580px;
  margin-bottom: 3rem;
}
.section-header {
  margin-bottom: 3rem;
}
.section-header.center {
  text-align: center;
}
.section-header.center .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* ── Utilities ──────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}
.text-accent   { color: var(--accent); }
.text-muted    { color: var(--text-muted); }
.text-secondary{ color: var(--text-secondary); }
.text-center   { text-align: center; }
.text-right    { text-align: right; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.fw-800 { font-weight: 800; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.flex-wrap { flex-wrap: wrap; }

/* ── Scroll Reveal (initial state) ─────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Toast Notifications ────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  min-width: 280px;
  max-width: 400px;
  pointer-events: auto;
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.toast.show { opacity: 1; transform: translateX(0); }
.toast.hide { opacity: 0; transform: translateX(20px); }
.toast-success { border-left: 3px solid var(--success); }
.toast-error   { border-left: 3px solid var(--danger); }
.toast-warning { border-left: 3px solid var(--warning); }
.toast-icon { flex-shrink: 0; }
.toast-success .toast-icon { color: var(--success); }
.toast-error   .toast-icon { color: var(--danger); }
.toast-warning .toast-icon { color: var(--warning); }