:root {
  --bg: #06111f;
  --surface: rgba(255,255,255,0.075);
  --line: rgba(255,255,255,0.16);
  --text: #f8fbff;
  --muted: #b8c7da;
  --cyan: #68e1ff;
  --amber: #f59e0b;
  --green: #10b981;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  font-family: 'Nunito', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.72), transparent 86%);
}

.topnav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 4vw;
  background: rgba(3,8,18,0.9);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--text);
  font-family: 'Baloo 2', cursive;
  font-weight: 800;
  font-size: 1.05rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  white-space: nowrap;
}
.brand::before {
  content: '';
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  background: url('mitra-ai-logo.svg') center/contain no-repeat;
}
.brand span { color: var(--cyan); }

.track-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
  max-width: 100%;
}
.track-links a {
  --pill-bg: rgba(255,255,255,0.055);
  --pill-border: rgba(255,255,255,0.12);
  --pill-text: var(--muted);
  --pill-shadow: transparent;
  color: var(--pill-text);
  text-decoration: none;
  border: 1px solid var(--pill-border);
  background: var(--pill-bg);
  border-radius: 999px;
  padding: 0.3rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 800;
  white-space: nowrap;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08), 0 6px 18px var(--pill-shadow);
  transition: transform 0.15s ease, filter 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.track-links a:nth-child(1) {
  --pill-bg: linear-gradient(180deg, rgba(14,165,233,0.9), rgba(2,132,199,0.85));
  --pill-border: rgba(125,211,252,0.62);
  --pill-text: #f0faff;
  --pill-shadow: rgba(14,165,233,0.28);
}
.track-links a:nth-child(2) {
  --pill-bg: linear-gradient(180deg, rgba(139,92,246,0.95), rgba(109,40,217,0.92));
  --pill-border: rgba(196,181,253,0.65);
  --pill-text: #f7f3ff;
  --pill-shadow: rgba(139,92,246,0.32);
}
.track-links a:nth-child(3) {
  --pill-bg: linear-gradient(180deg, rgba(99,102,241,0.95), rgba(67,56,202,0.92));
  --pill-border: rgba(165,180,252,0.62);
  --pill-text: #eef2ff;
  --pill-shadow: rgba(99,102,241,0.28);
}
.track-links a:nth-child(4) {
  --pill-bg: linear-gradient(180deg, rgba(59,130,246,0.95), rgba(29,78,216,0.92));
  --pill-border: rgba(147,197,253,0.62);
  --pill-text: #eff6ff;
  --pill-shadow: rgba(59,130,246,0.28);
}
.track-links a:nth-child(5) {
  --pill-bg: linear-gradient(180deg, rgba(34,197,94,0.95), rgba(22,163,74,0.92));
  --pill-border: rgba(134,239,172,0.62);
  --pill-text: #f0fdf4;
  --pill-shadow: rgba(34,197,94,0.28);
}
.track-links a:nth-child(6) {
  --pill-bg: linear-gradient(180deg, rgba(250,204,21,0.98), rgba(234,179,8,0.95));
  --pill-border: rgba(254,240,138,0.72);
  --pill-text: #2f2100;
  --pill-shadow: rgba(250,204,21,0.28);
}
.track-links a:nth-child(7) {
  --pill-bg: linear-gradient(180deg, rgba(251,146,60,0.98), rgba(234,88,12,0.94));
  --pill-border: rgba(253,186,116,0.72);
  --pill-text: #2c1300;
  --pill-shadow: rgba(249,115,22,0.28);
}
.track-links a:nth-child(8) {
  --pill-bg: linear-gradient(180deg, rgba(248,113,113,0.96), rgba(220,38,38,0.92));
  --pill-border: rgba(252,165,165,0.65);
  --pill-text: #fff1f2;
  --pill-shadow: rgba(248,113,113,0.28);
}
.track-links a:nth-child(9) {
  --pill-bg: linear-gradient(180deg, rgba(236,72,153,0.9), rgba(219,39,119,0.85));
  --pill-border: rgba(249,168,212,0.62);
  --pill-text: #fff0f8;
  --pill-shadow: rgba(236,72,153,0.28);
}
.track-links a:hover,
.track-links a.active {
  color: var(--pill-text);
  border-color: color-mix(in srgb, var(--pill-border) 70%, white 30%);
  filter: saturate(1.08) brightness(1.03);
  transform: translateY(-1px);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.12), 0 10px 24px var(--pill-shadow);
}
.track-links::-webkit-scrollbar { display: none; }

/* ─── language switcher ──────────────────────────────────────────────────── */
/* ─── nav actions (lang-switcher + auth) ───────────────────────────────── */
.nav-actions { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
#auth-nav-area { display: flex; align-items: center; }
#auth-nav-area button { font-size: 0.78rem !important; padding: 5px 12px !important; }
.lang-switcher { position: relative; display: inline-block; flex-shrink: 0; }
.lang-switcher-btn {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 20px;
  color: var(--text);
  cursor: pointer;
  font: 600 0.8rem 'Nunito', sans-serif;
  padding: 6px 14px;
  white-space: nowrap;
}
.lang-switcher-btn:hover { background: rgba(255,255,255,0.12); }
.lang-switcher-menu {
  display: none;
  position: absolute;
  right: 0; top: calc(100% + 6px);
  min-width: 170px;
  background: #0d1b2e;
  border: 1px solid rgba(83,166,255,0.22);
  border-radius: 12px;
  padding: 6px;
  z-index: 300;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}
.lang-switcher:hover .lang-switcher-menu,
.lang-switcher:focus-within .lang-switcher-menu { display: block; }
.lang-option {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text);
  text-decoration: none;
  cursor: default;
}
.lang-option:hover { background: rgba(83,166,255,0.12); color: var(--text); }
.lang-option.active { color: var(--cyan,#68e1ff); font-weight: 800; }
.lang-option small { display: block; font-size: 0.72rem; color: rgba(159,179,218,0.5); font-weight: 400; margin-top: 1px; }

.hero {
  position: relative;
  z-index: 1;
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  padding: clamp(4rem, 8vw, 7rem) 5vw;
}

.hero-single {
  grid-template-columns: minmax(0, 1fr);
  min-height: auto;
  max-width: 980px;
  margin: 0 auto;
  padding-bottom: 3rem;
}

.hero-copy {
  max-width: 860px;
}

.eyebrow {
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

h1 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  line-height: 1.08;
  margin-bottom: 1.2rem;
  letter-spacing: 0;
}

.lead {
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.65;
  max-width: 700px;
}

.actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.75rem 1.3rem;
  border-radius: 12px;
  font-weight: 900;
  text-decoration: none;
}
.btn.primary { background: var(--amber); color: #201200; box-shadow: 0 4px 0 #9a5b00; }
.btn.secondary { color: var(--text); border: 1px solid var(--line); background: rgba(255,255,255,0.08); }

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: clamp(1.5rem, 4vw, 2rem);
  box-shadow: 0 20px 70px rgba(0,0,0,0.22);
  min-width: 0;
}
.panel h2 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
}
.panel-kicker {
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.panel-note {
  color: rgba(248,251,255,0.7);
  font-size: 0.82rem;
  line-height: 1.5;
  margin-top: 0.8rem;
}
.panel-divider {
  height: 1px;
  border: 0;
  background: rgba(255,255,255,0.12);
  margin: 1.35rem 0;
}
.panel ul { list-style: none; display: grid; gap: 0.85rem; }
.panel li { color: var(--muted); line-height: 1.55; }
.panel li strong { color: var(--text); }

.band {
  position: relative;
  z-index: 1;
  padding: 4rem 5vw;
  border-top: 1px solid var(--line);
  background: rgba(0,0,0,0.14);
}
.band-inner { max-width: 980px; margin: 0 auto; }
.band h2 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  margin-bottom: 1rem;
}
.band p { color: var(--muted); line-height: 1.7; font-size: 1.05rem; }

.status-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}
.status-card {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.055);
  border-radius: 14px;
  padding: 1rem;
}
.status-card h3 { font-size: 1rem; margin-bottom: 0.4rem; }
.status-card p { font-size: 0.92rem; }

.simple-list {
  margin-top: 1rem;
  padding-left: 1.2rem;
  color: var(--muted);
  display: grid;
  gap: 0.7rem;
}

.simple-list li {
  line-height: 1.65;
}

.practice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.practice-card {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.055);
  border-radius: 14px;
  padding: 1rem;
}

.practice-card h3 {
  font-size: 1rem;
  margin-bottom: 0.45rem;
}

.practice-card p {
  font-size: 0.94rem;
  color: var(--muted);
}

/* ── Swar letter grid ─────────────────────────────────── */
.swar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.swar-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 0.5rem 0.65rem;
  gap: 0.4rem;
}

.swar-letter {
  font-family: 'Devanagari Sangam MN', 'Noto Sans Devanagari', serif;
  font-size: clamp(2.8rem, 5.5vw, 3.4rem);
  line-height: 1;
  color: var(--text);
}

.swar-label {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text);
  text-transform: uppercase;
}

/* ── Video block ─────────────────────────────────────── */
.video-block {
  margin-top: 1.25rem;
  border-radius: 14px;
  overflow: hidden;
  background: #000;
  max-width: 100%;
}

.video-block video {
  display: block;
  width: 100%;
  height: auto;
  max-height: min(68vh, 760px);
  object-fit: contain;
}

/* ── Letter card image grid ──────────────────────────── */
.letter-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.letter-card-grid img {
  display: block;
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
}

/* ── Lesson link list ────────────────────────────────── */
.lesson-link-list {
  margin-top: 1.25rem;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.6rem;
}

.lesson-link-list li {
  font-size: 0.97rem;
  color: var(--muted);
  line-height: 1.6;
}

.lesson-link-list a {
  color: var(--cyan);
  font-weight: 800;
  text-decoration: none;
}

.lesson-link-list a:hover {
  text-decoration: underline;
}

.topic-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.topic-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 900;
}

.topic-pill.active {
  background: var(--amber);
  border-color: rgba(255,255,255,0.15);
  color: #201200;
}

.topic-pill.muted {
  color: var(--muted);
}

.syllabus-grid,
.lesson-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.lesson-preview {
  overflow: hidden;
  padding: 0;
}

.lesson-preview img,
.media-card img,
.media-card video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: rgba(255,255,255,0.08);
}

.lesson-preview-body,
.media-card-body {
  padding: 1rem;
}

.lesson-preview-body h3,
.media-card-body h3 {
  font-size: 1.05rem;
  margin-bottom: 0.45rem;
}

.lesson-preview-body p,
.media-card-body p {
  font-size: 0.94rem;
}

.media-showcase {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.media-card {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.055);
  border-radius: 14px;
  overflow: hidden;
}

.inline-link {
  color: var(--cyan);
  font-weight: 800;
  text-decoration: none;
}

.inline-link:hover {
  text-decoration: underline;
}

footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding: 2rem 5vw;
  color: var(--muted);
  font-size: 1.05rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
footer .footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
footer a { color: var(--cyan); text-decoration: none; font-weight: 800; }

.faq .faq-list { display: grid; gap: 0.75rem; margin-top: 1rem; }
.faq details {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 0.9rem 1.1rem;
}
.faq details[open] { background: rgba(255,255,255,0.06); }
.faq summary {
  cursor: pointer;
  font-weight: 800;
  color: var(--text);
  list-style: none;
  font-family: 'Baloo 2', system-ui, sans-serif;
  font-size: 1.05rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; float: right; color: var(--cyan); font-weight: 900; margin-left: 1rem; }
.faq details[open] summary::after { content: '\2212'; }
.faq details p { margin-top: 0.6rem; color: var(--muted); line-height: 1.55; }

/* Touch targets: ensure interactive elements meet 44px guideline */
.faq summary { min-height: 44px; display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; }
.faq summary::after { float: none; margin-left: auto; }
footer a { padding: 0.35rem 0.1rem; display: inline-block; }

body.theme-daily { --bg: #06111f; --cyan: #68e1ff; --amber: #f59e0b; }
body.theme-students { --bg: #082033; --cyan: #7dd3fc; --amber: #facc15; }
body.theme-tuition { --bg: #102018; --cyan: #86efac; --amber: #fbbf24; }
body.theme-english { --bg: #181126; --cyan: #c4b5fd; --amber: #fb7185; }
body.theme-projects { --bg: #0d1117; --cyan: #00d4aa; --amber: #f0b429; }
body.theme-business { --bg: #171006; --cyan: #fdba74; --amber: #22c55e; }
body.theme-teachers { --bg: #081a26; --cyan: #67e8f9; --amber: #a3e635; }
body.theme-contact { --bg: #111827; --cyan: #93c5fd; --amber: #fbbf24; }

@media (max-width: 860px) {
  .topnav { grid-template-columns: minmax(0, 1fr); overflow: hidden; }
  .track-links { width: 100%; justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 0; scrollbar-width: none; }
  .hero { grid-template-columns: minmax(0, 1fr); min-height: auto; padding-top: 3rem; }
  .media-showcase { grid-template-columns: minmax(0, 1fr); }
  h1 { font-size: clamp(2rem, 12vw, 3rem); }
  .actions { flex-direction: column; }
  .btn { width: 100%; text-align: center; }
  .status-grid { grid-template-columns: minmax(0, 1fr); }
  .syllabus-grid, .lesson-preview-grid { grid-template-columns: minmax(0, 1fr); }
  footer { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 420px) {
  .brand { text-align: center; }
  .topnav { padding: 0.75rem 4vw; }
  .hero, .band { padding-left: 4vw; padding-right: 4vw; }
  .panel { padding: 1.2rem; }
  .status-card .btn { width: 100%; text-align: center; margin-top: 0.75rem; }
}