/* ============================================================
   RequestNotes — Main CSS
   © Last Minute Education Pvt. Limited
   ============================================================ */

/* ─── THEME TOKENS — DARK MODE (Default) ─── */
:root {
  --bg:           #09090b;
  --surface:      #111113;
  --card:         #18181b;

  --border:       #27272a;
  --border-light: #3f3f46;

  --text:         #fafafa;
  --muted:        #a1a1aa;
  --dim:          #52525b;

  --accent:       #6366f1;
  --accent2:      #818cf8;
  --accent3:      #a5b4fc;

  --green:        #22c55e;
  --amber:        #f59e0b;
  --coral:        #f97316;
  --pink:         #ec4899;
  --teal:         #14b8a6;

  --shadow:       0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg:    0 8px 32px rgba(0,0,0,0.6);

  --radius:       6px;
  --radius-md:    8px;
  --radius-lg:    12px;

  --header-height: 60px;
}

/* ─── LIGHT MODE ─── */
.light,
[data-theme="light"] {
  --bg:           #fafaf9;
  --surface:      #f4f4f5;
  --card:         #ffffff;

  --border:       #e4e4e7;
  --border-light: #d4d4d8;

  --text:         #09090b;
  --muted:        #52525b;
  --dim:          #a1a1aa;

  --shadow:       0 1px 3px rgba(0,0,0,0.06);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg:    0 8px 32px rgba(0,0,0,0.12);

  --green-text:   #15803d;
  --amber-text:   #b45309;
  --coral-text:   #c2410c;
  --pink-text:    #be185d;
  --teal-text:    #0f766e;
}

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

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.2s ease, color 0.2s ease;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent2);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent3);
}

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

ul, ol {
  list-style: none;
}

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

/* ─── LAYOUT ─── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--wide {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ─── TYPOGRAPHY ─── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
}

h1 { font-size: clamp(2rem, 4vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  color: var(--muted);
  line-height: 1.75;
}

code, pre {
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875em;
}

code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2px 6px;
  color: var(--accent3);
}

pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  overflow-x: auto;
  line-height: 1.6;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
}

/* ─── TEXT UTILITIES ─── */
.text-muted   { color: var(--muted); }
.text-dim     { color: var(--dim); }
.text-accent  { color: var(--accent2); }
.text-sm      { font-size: 0.875rem; }
.text-xs      { font-size: 0.75rem; }
.text-lg      { font-size: 1.125rem; }
.text-center  { text-align: center; }
.font-medium  { font-weight: 500; }
.font-semibold{ font-weight: 600; }
.font-bold    { font-weight: 700; }

/* ─── FLEX UTILITIES ─── */
.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col     { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.items-start  { align-items: flex-start; }
.flex-wrap    { flex-wrap: wrap; }

.gap-4  { gap: 4px; }
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.gap-32 { gap: 32px; }
.gap-40 { gap: 40px; }

/* ─── SPACING UTILITIES ─── */
.mt-4  { margin-top: 4px; }
.mt-8  { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-40 { margin-top: 40px; }
.mt-48 { margin-top: 48px; }

.mb-8  { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-40 { margin-bottom: 40px; }

/* ─── SECTION SPACING ─── */
.section {
  padding: 80px 0;
}

.section--sm {
  padding: 48px 0;
}

.section--lg {
  padding: 120px 0;
}

/* ─── SECTION HEADER ─── */
.section-header {
  margin-bottom: 40px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent2);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--muted);
  max-width: 560px;
  line-height: 1.7;
}

/* ─── BREADCRUMB ─── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--muted);
  padding: 12px 0 24px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--muted);
  transition: color 0.15s ease;
}

.breadcrumb a:hover {
  color: var(--text);
}

.breadcrumb-sep {
  color: var(--dim);
  font-size: 0.75rem;
}

.breadcrumb-current {
  color: var(--text);
}

/* ─── DIVIDER ─── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

/* ─── GRID UTILITIES ─── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.grid-auto-fill {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.grid-auto-fit {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

/* ─── ACCESSIBILITY ─── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius);
}

/* ─── SCROLLBAR ─── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--surface); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* ─── SELECTION ─── */
::selection {
  background: rgba(99,102,241,0.25);
  color: var(--text);
}

/* ─── RESPONSIVE BREAKPOINTS ─── */
@media (max-width: 1024px) {
  .container { padding: 0 20px; }
  .section { padding: 60px 0; }
}

@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .section { padding: 48px 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-auto-fill { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}