:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #1f2a44;
  --muted: #63708a;
  --primary: #1f45b5;
  --primary-deep: #173899;
  --accent: #f1c40f;
  --border: #e3e9f5;
  --shadow: 0 12px 30px rgba(22, 45, 120, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

a {
  text-decoration: none;
}

.container {
  width: min(1280px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.93);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  min-height: 74px;
  display: grid;
  grid-template-columns: auto minmax(280px, 560px) auto;
  align-items: center;
  gap: 0.75rem;
}

.brand {
  color: var(--primary-deep);
  font-weight: 700;
  font-size: 1.3rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--primary);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
}

.brand-logo {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 8px 18px rgba(31, 69, 181, 0.16);
}

.search-box input {
  width: 100%;
  border: 1px solid #d9e1f2;
  background: #f8faff;
  border-radius: 12px;
  padding: 0.85rem 1rem;
  color: var(--text);
  outline: none;
}

.search-box input:focus {
  border-color: #8ea6ef;
  box-shadow: 0 0 0 4px rgba(31, 69, 181, 0.12);
}

.site-search-panel {
  position: relative;
}

.main-nav {
  display: inline-flex;
  gap: 1.2rem;
  justify-self: end;
}

.main-nav a {
  color: #324364;
  font-weight: 500;
}

.main-nav a:hover {
  color: var(--primary);
}

.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #234cca 65%, #254fce 100%);
  color: #fff;
  padding: 4.5rem 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.2rem;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero-copy p {
  color: #d8e1ff;
  font-size: 1.1rem;
  max-width: 560px;
}

.hero-actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.35rem;
  border-radius: 12px;
  font-weight: 600;
  transition: 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: #153057;
}

.btn-primary:hover {
  transform: translateY(-1px);
  filter: brightness(1.02);
}

.btn-outline {
  border: 1px solid rgba(255, 255, 255, 0.6);
  color: #fff;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
}

.hero-media img {
  border-radius: 20px;
  box-shadow: 0 18px 42px rgba(4, 17, 55, 0.35);
  min-height: 340px;
  object-fit: cover;
}

.section {
  padding: 4.5rem 0;
}

.narrow {
  width: min(820px, 92%);
}

h2 {
  text-align: center;
  color: var(--primary-deep);
  font-size: clamp(1.8rem, 3vw, 2.2rem);
  margin-bottom: 1.2rem;
}

.about p {
  text-align: center;
  color: var(--muted);
  font-size: 1.1rem;
}

.grid {
  display: grid;
  gap: 1.2rem;
}

.four-col {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.three-col {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--surface);
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.course-card {
  width: min(520px, 100%);
  margin: 1.5rem auto 0;
  padding: 1.4rem;
}

.course-card h3 {
  font-size: 1.85rem;
  color: #243f86;
}

.course-card p {
  color: var(--muted);
  margin: 0.5rem 0 0.75rem;
}

.text-link {
  color: #c7980f;
  font-weight: 700;
}

.resource-card {
  padding: 1.2rem;
}

.resource-card h3 {
  color: #28437f;
  margin-top: 0.7rem;
}

.resource-card p {
  color: var(--muted);
}

.icon-chip {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: #edf2ff;
}

.light-blue {
  background: #e6efff;
}

.light-yellow {
  background: #fff5cc;
}

.light-green {
  background: #dbf7ea;
}

.light-purple {
  background: #f1e7ff;
}

.video-card {
  overflow: hidden;
}

.video-thumb {
  background: linear-gradient(135deg, #214cc8 0%, #1a3eab 100%);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-size: 2.5rem;
  height: 170px;
}

.video-copy {
  padding: 1rem;
}

.video-copy h3 {
  color: #28437f;
}

.video-copy p {
  color: var(--muted);
}

.why-us {
  background: linear-gradient(145deg, #1e42ae 0%, #244ecb 100%);
}

.why-us h2 {
  color: #fff;
}

.benefits article {
  text-align: center;
  color: #dbe6ff;
  padding: 1rem;
}

.benefits span {
  width: 58px;
  height: 58px;
  margin: 0 auto 0.7rem;
  border-radius: 50%;
  background: var(--accent);
  color: #12386f;
  font-size: 1.55rem;
  display: grid;
  place-items: center;
}

.benefits h3 {
  color: #fff;
  margin-bottom: 0.2rem;
}

.site-footer {
  background: #14368f;
  color: #d9e6ff;
  padding-top: 3rem;
}

.footer-grid {
  display: grid;
  gap: 1.4rem;
  grid-template-columns: 1.2fr repeat(3, 1fr);
}

.site-footer h3,
.site-footer h4 {
  color: #fff;
  margin-bottom: 0.7rem;
}

.site-footer a {
  display: block;
  color: #d9e6ff;
  margin-bottom: 0.35rem;
}

.site-footer a:hover {
  color: var(--accent);
}

.copyright {
  margin-top: 2.2rem;
  border-top: 1px solid rgba(217, 230, 255, 0.2);
  text-align: center;
  padding: 1.2rem 0;
}

@media (max-width: 980px) {
  .nav-wrap {
    grid-template-columns: 1fr;
    padding: 0.8rem 0;
  }

  .main-nav {
    justify-content: center;
  }

  .hero-grid,
  .four-col,
  .three-col,
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-copy h1 {
    max-width: 18ch;
  }
}

@media (max-width: 680px) {
  .hero-grid,
  .four-col,
  .three-col,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 3.5rem 0;
  }

  .section {
    padding: 3.3rem 0;
  }
}

.upsc-page {
  padding-bottom: 3rem;
}

.upsc-hero {
  padding: 3rem 0 1.4rem;
}

.upsc-hero h1 {
  text-align: center;
  color: var(--primary-deep);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.2;
}

.upsc-hero p {
  max-width: 760px;
  margin: 0.9rem auto 0;
  text-align: center;
  color: var(--muted);
  font-size: 1.1rem;
}

.upsc-subjects {
  padding-bottom: 2.2rem;
}

.search-panel {
  position: relative;
  margin-bottom: 1.2rem;
  padding: 1rem;
}

.search-panel input {
  width: 100%;
  border: 1px solid #d9e1f2;
  border-radius: 12px;
  padding: 0.85rem 1rem;
  background: #f8faff;
  color: var(--text);
}

.course-search-dropdown {
  position: absolute;
  left: 1rem;
  right: 1rem;
  top: calc(100% - 0.5rem);
  z-index: 8;
  display: none;
  max-height: 340px;
  overflow-y: auto;
  border: 1px solid #d9e1f2;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 18px 38px rgba(22, 45, 120, 0.16);
}

.site-search-panel .course-search-dropdown {
  left: 0;
  right: 0;
  top: calc(100% + 0.5rem);
}

.course-search-dropdown.is-open {
  display: block;
}

.course-search-option {
  width: 100%;
  display: grid;
  gap: 0.15rem;
  padding: 0.85rem 1rem;
  border: 0;
  border-bottom: 1px solid #edf1f8;
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
}

.course-search-option:last-child {
  border-bottom: 0;
}

.course-search-option:hover,
.course-search-option:focus {
  background: #f4f7ff;
  outline: none;
}

.course-search-option strong {
  color: #243f86;
  font-size: 0.98rem;
}

.course-search-option span {
  color: var(--muted);
  font-size: 0.82rem;
}

.course-search-empty {
  padding: 0.9rem 1rem;
  color: var(--muted);
}

.topic-heading {
  margin-top: 2rem;
}

.subject-grid {
  align-items: stretch;
}

.subject-card {
  overflow: hidden;
}

.subject-header {
  height: 94px;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 2.35rem;
  font-weight: 700;
}

.subject-blue {
  background: linear-gradient(135deg, #1c46be 0%, #2452d6 100%);
}

.subject-green {
  background: linear-gradient(135deg, #37a86e 0%, #4ab37b 100%);
}

.subject-brown {
  background: linear-gradient(135deg, #bd7a3f 0%, #c9874a 100%);
}

.subject-cyan {
  background: linear-gradient(135deg, #2f8eae 0%, #3b9aba 100%);
}

.subject-teal {
  background: linear-gradient(135deg, #299f87 0%, #41ad95 100%);
}

.subject-purple {
  background: linear-gradient(135deg, #9046d2 0%, #a45ae5 100%);
}

.subject-red {
  background: linear-gradient(135deg, #c83f50 0%, #d14c5d 100%);
}

.subject-body {
  padding: 1rem 1rem 1.2rem;
}

.subject-body h3 {
  color: #33497b;
  font-size: 1.45rem;
  line-height: 1.2;
  margin-bottom: 0.35rem;
}

.subject-body p {
  color: var(--muted);
  margin-bottom: 0.8rem;
}

.soon {
  color: #c4cddd;
  font-weight: 600;
}

.topic-subject {
  font-weight: 600;
  color: #3c5388;
}

.topic-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.topic-action {
  display: inline-block;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  border: 1px solid #d4ddf3;
  color: #274684;
  font-weight: 600;
}

.empty-state {
  padding: 1.2rem;
  color: var(--muted);
}

.lecture-card iframe {
  width: 100%;
  height: 210px;
  border: 0;
  border-radius: 0;
}

.how-to {
  margin-top: 2rem;
  background: #eef3fb;
  border: 1px solid #dde7f7;
  box-shadow: none;
  padding: 1.8rem 1.4rem;
}

.how-to h2 {
  text-align: left;
  margin-bottom: 0.8rem;
  font-size: 2rem;
}

.how-to ol {
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.how-to li {
  color: #516381;
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.how-to li::before {
  content: counter(step);
  counter-increment: step;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 50%;
  background: var(--accent);
  color: #19386e;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.8rem;
}

.how-to ol {
  counter-reset: step;
}