/* ============================================================
   BASE STYLES — base.css
   Global defaults, typography, layout foundations.
   ============================================================ */

/* ── Google Font Import ─────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

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

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

:root[data-theme='light'] {
  color-scheme: light;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-base);
  font-weight: var(--weight-normal);
  line-height: var(--line-height);
  color: var(--text-primary);
  background: var(--bg-primary);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(139, 92, 246, 0.5);
}

* {
  scrollbar-width: thin;
  scrollbar-color: rgba(139, 92, 246, 0.3) transparent;
}

/* ── Typography Defaults ────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-semibold);
  line-height: 1.3;
  color: var(--text-primary);
}

h1 { font-size: var(--font-3xl); }
h2 { font-size: var(--font-2xl); }
h3 { font-size: var(--font-xl); }
h4 { font-size: var(--font-lg); }
h5 { font-size: var(--font-md); }
h6 { font-size: var(--font-base); }

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-blue-light);
}

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

button {
  font-family: var(--font-family);
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
  font-size: var(--font-base);
}

input, textarea, select {
  font-family: var(--font-family);
  font-size: var(--font-base);
  outline: none;
  border: none;
}

ul, ol {
  list-style: none;
}

::selection {
  background: rgba(139, 92, 246, 0.3);
  color: var(--text-primary);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at top left, rgba(139, 92, 246, 0.18), transparent 24%),
    radial-gradient(circle at top right, rgba(6, 182, 212, 0.16), transparent 20%),
    radial-gradient(circle at bottom left, rgba(236, 72, 153, 0.12), transparent 18%);
  z-index: -1;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: var(--gradient-card-shine);
  z-index: -1;
}

/* ── Utility Classes ────────────────────────────────────── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.grid { display: grid; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-xs { font-size: var(--font-xs); }
.text-sm { font-size: var(--font-sm); }
.text-base { font-size: var(--font-base); }
.text-md { font-size: var(--font-md); }
.text-lg { font-size: var(--font-lg); }
.text-xl { font-size: var(--font-xl); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-accent { color: var(--accent-blue); }
.font-medium { font-weight: var(--weight-medium); }
.font-semibold { font-weight: var(--weight-semibold); }
.font-bold { font-weight: var(--weight-bold); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.w-full { width: 100%; }
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ── Animations ─────────────────────────────────────── */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideInLeft { from { opacity: 0; transform: translateX(-20px); } to { opacity: 1; transform: translateX(0); } }
@keyframes scalePop { 0% { transform: scale(0.88); opacity: 0; } 70% { transform: scale(1.03); } 100% { transform: scale(1); opacity: 1; } }
@keyframes pulseGlow { 0%, 100% { box-shadow: 0 0 6px var(--accent-blue-glow); } 50% { box-shadow: 0 0 26px var(--accent-blue-glow), 0 0 48px var(--accent-blue-glow); } }
@keyframes firePulse { 0%, 100% { transform: scale(1); filter: brightness(1); } 50% { transform: scale(1.12); filter: brightness(1.2); } }
@keyframes shimmer { 0% { background-position: -200% center; } 100% { background-position: 200% center; } }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes gradientShift { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }
@keyframes progressFill { from { width: 0%; } }
@keyframes confettiBurst { 0% { transform: scale(0) rotate(0deg); opacity: 1; } 100% { transform: scale(1.5) rotate(180deg); opacity: 0; } }
@keyframes checkDraw { from { stroke-dashoffset: 20; } to { stroke-dashoffset: 0; } }
@keyframes countUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pageFadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

.animate-fadeIn { animation: fadeIn var(--duration-base) ease forwards; }
.animate-slideUp { animation: slideUp var(--duration-slow) ease forwards; }
.animate-slideInLeft { animation: slideInLeft var(--duration-slow) ease forwards; }
.animate-scalePop { animation: scalePop var(--duration-spring) var(--ease-spring) forwards; }
.animate-pulseGlow { animation: pulseGlow 2s ease-in-out infinite; }
.animate-firePulse { animation: firePulse 1s ease-in-out infinite; }
.animate-spin { animation: spin 1s linear infinite; }
.animate-float { animation: float 3s ease-in-out infinite; }
.animate-shimmer {
  background: linear-gradient(90deg, transparent 25%, rgba(255,255,255,0.05) 50%, transparent 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

.stagger-children > * {
  animation: slideUp var(--duration-slow) ease forwards;
  opacity: 0;
}
.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 80ms; }
.stagger-children > *:nth-child(3) { animation-delay: 160ms; }
.stagger-children > *:nth-child(4) { animation-delay: 240ms; }
.stagger-children > *:nth-child(5) { animation-delay: 320ms; }
.stagger-children > *:nth-child(6) { animation-delay: 400ms; }
.stagger-children > *:nth-child(7) { animation-delay: 480ms; }
.stagger-children > *:nth-child(8) { animation-delay: 560ms; }

/* ── Layout shells ─────────────────────────────────────── */
.page-shell {
  min-height: 100vh;
  position: relative;
  isolation: isolate;
  animation: pageFadeIn 0.5s var(--ease-spring) both;
}

.page-shell::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(139, 92, 246, 0.12), transparent 20%), radial-gradient(circle at top right, rgba(6, 182, 212, 0.14), transparent 22%);
  pointer-events: none;
  z-index: -1;
}

/* ── Toasts ────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}

.toast {
  pointer-events: all;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: var(--font-sm);
  font-weight: var(--weight-medium);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  animation: slideInLeft var(--duration-base) ease forwards;
  box-shadow: var(--shadow-md);
  max-width: 360px;
}

.toast.toast-success { border-left: 3px solid var(--accent-green); }
.toast.toast-error { border-left: 3px solid var(--accent-red); }
.toast.toast-info { border-left: 3px solid var(--accent-blue); }
.toast.toast-warning { border-left: 3px solid var(--accent-orange); }

.toast-exit { animation: fadeIn var(--duration-fast) ease reverse forwards; }

.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-overlay);
  transition: opacity var(--transition-slow);
}

.loading-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}