:root {
  --bg: #0b1020;
  --bg-soft: #121a30;
  --card: rgba(18, 26, 48, 0.86);
  --text: #ecf2ff;
  --muted: #aac0eb;
  --accent: #60a5fa;
  --accent-strong: #3b82f6;
  --border: rgba(134, 160, 220, 0.25);
  --shadow: 0 12px 35px rgba(1, 7, 22, 0.45);
}

html[data-theme='light'] {
  --bg: #eef3ff;
  --bg-soft: #dbe7ff;
  --card: rgba(255, 255, 255, 0.93);
  --text: #10203a;
  --muted: #4a607e;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --border: rgba(89, 121, 184, 0.25);
  --shadow: 0 10px 25px rgba(82, 108, 150, 0.2);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(96, 165, 250, 0.25), transparent 30%),
    radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.25), transparent 35%),
    linear-gradient(130deg, var(--bg), var(--bg-soft));
  min-height: 100vh;
}

a { color: var(--text); }

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-soft) 72%, transparent);
  backdrop-filter: blur(10px);
}

.nav-left, .nav-right {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}


.brand {
  text-decoration: none;
  font-weight: 800;
  letter-spacing: .02em;
  padding: .4rem .75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--card) 80%, transparent);
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}

.brand-logo {
  width: 100px;
  height: 30px;
  border-radius: 20%;
  object-fit: cover;
}

.community-switch {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.community-switch label {
  font-size: .85rem;
  color: var(--muted);
}

.community-switch label a {
  color: inherit;
}


.profile-banner-preview-wrap {
  margin: 0 0 .8rem;
}

.profile-banner-preview,
.profile-banner-placeholder {
  width: 100%;
  height: 180px;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.profile-banner-preview {
  object-fit: cover;
  display: block;
}

.profile-banner-placeholder,
.profile-public-banner-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  color: color-mix(in srgb, var(--text) 80%, transparent);
  font-weight: 600;
  background: linear-gradient(135deg, #7c3aed, #a855f7 45%, #c084fc);
}

.profile-public-card {
  overflow: hidden;
  padding: 0;
}

.profile-public-banner-wrap {
  width: 100%;
}

.profile-public-banner {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.profile-public-header {
  display: flex;
  align-items: end;
  gap: .9rem;
  padding: 0 1rem;
  margin-top: -2.2rem;
}

.profile-public-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 3px solid var(--card);
  object-fit: cover;
  background: var(--bg-soft);
}

.profile-public-card > p,
.profile-public-card > h2 {
  padding: 0 1rem;
}

.profile-public-card > p:last-child {
  padding-bottom: 1rem;
}

.profile-avatar-preview {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin: .5rem 0 1rem;
  border: 1px solid var(--border);
}

main {
  max-width: 1080px;
  margin: 1.4rem auto;
  padding: 0 1rem 2rem;
}

h1, h2, h3 { margin-top: .2rem; }
p, small { color: var(--muted); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.hero { margin-bottom: 1rem; }
.hero-actions { display:flex; gap:.7rem; flex-wrap:wrap; align-items:center; }

input, textarea, select, button {
  width: 100%;
  margin: .4rem 0;
  padding: .72rem .8rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-soft) 50%, transparent);
  color: var(--text);
}

textarea { min-height: 110px; resize: vertical; }

button, .btn {
  width: auto;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #f8fbff;
  font-weight: 700;
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  text-align: center;
  padding: .68rem 1rem;
  border-radius: 12px;
}

.btn.danger {
  background: linear-gradient(135deg, #ef4444, #b91c1c);
}

.classroom-course-header,
.classroom-lesson-row {
  display: flex;
  align-items: center;
  gap: .6rem;
  justify-content: space-between;
  flex-wrap: wrap;
}

.classroom-lesson-row {
  margin-bottom: .25rem;
}

.btn.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.post-card + .post-card {
  margin-top: 1rem;
}

.post-body {
  white-space: pre-wrap;
}

.inline-reply-form {
  margin-top: .6rem;
}

.post-card .comment-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .5rem;
  align-items: end;
}

.comment-item {
  margin: .4rem 0;
  padding: .5rem .7rem;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--card) 70%, transparent);
  border-radius: 10px;
}

.flash { padding: .7rem .9rem; border-radius: 10px; border: 1px solid transparent; }
.flash.success { background: #14532d; color: #d7ffe5; }
.flash.danger { background: #7f1d1d; color: #ffd5d5; }
.flash.info { background: #0c4a6e; color: #d7efff; }
.flash.warning { background: #78350f; color: #ffedd5; }

.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 50;
}

.modal.open { display: block; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(3, 8, 20, 0.7);
}

.modal-content {
  position: relative;
  max-width: 720px;
  margin: 8vh auto;
}

.community-shell {
  position: relative;
}

.community-sidebar {
  position: fixed;
  left: 1rem;
  top: 90px;
  width: 260px;
}

.community-main {
  max-width: 100%;
}

.community-menu {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

.community-menu a {
  text-decoration: none;
  padding: .6rem .7rem;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.community-menu a.active {
  background: color-mix(in srgb, var(--accent) 28%, transparent);
}

.comment-form-large textarea {
  min-height: 160px;
}

.comment-item.is-reply {
  margin-top: .6rem;
  margin-left: 1.2rem;
  border-left-color: var(--accent-strong);
}

@media (max-width: 1280px) {
  .community-sidebar {
    position: static;
    width: 100%;
    margin-bottom: 1rem;
  }
}

.landing-hero {
  padding: 1.4rem;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 26%, var(--card)), var(--card));
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: .75rem;
  font-weight: 700;
}

.feature-grid .card h3 {
  margin-bottom: .4rem;
}

.search-form {
  margin-bottom: 1rem;
}


.post-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: .8rem;
}

.post-author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}

.comments-toggle {
  margin-top: .6rem;
}

.post-comments {
  margin-top: .6rem;
}

.community-hero-image {
  width: 100%;
  max-height: 260px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-bottom: .7rem;
}

.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;
}

.hub-hero {
  text-align: center;
  margin: 1rem auto 1.5rem;
  max-width: 700px;
}

.hub-pill {
  display: inline-flex;
  align-items: center;
  padding: .35rem .7rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 15%, var(--card));
  color: var(--accent);
  font-weight: 700;
  font-size: .85rem;
  margin-bottom: .7rem;
}

.hub-hero h1 {
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.04;
  margin-bottom: .5rem;
}

.hub-subtitle {
  max-width: 560px;
  margin: 0 auto;
  font-size: 1.1rem;
}

.hub-toolbar {
  padding: .9rem;
  margin-bottom: 1rem;
}

.hub-search-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .6rem;
  margin-bottom: .8rem;
}

.hub-search-form input {
  margin: 0;
  background: color-mix(in srgb, var(--card) 76%, transparent);
}

.hub-search-form button {
  margin: 0;
}

.hub-categories {
  display: flex;
  gap: .45rem;
  flex-wrap: wrap;
}

.hub-categories a {
  text-decoration: none;
}

.chip {
  padding: .34rem .72rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: .83rem;
  background: color-mix(in srgb, var(--card) 80%, transparent);
}

.chip.active {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.hub-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.hub-card-media {
  position: relative;
  height: 210px;
}

.hub-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hub-price {
  position: absolute;
  top: .6rem;
  right: .6rem;
  font-size: .76rem;
  border-radius: 999px;
  padding: .22rem .55rem;
  color: #fff;
  font-weight: 700;
}

.hub-price.is-free { background: #22c55e; }
.hub-price.is-paid { background: #f59e0b; }

.hub-card-body {
  padding: .85rem .9rem 1rem;
}

.hub-card-headline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: .5rem;
}

.hub-card-headline h3 {
  margin: 0;
}

.hub-tag {
  font-size: .74rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .15rem .52rem;
  color: var(--muted);
  white-space: nowrap;
}

.hub-card-body p {
  margin: .45rem 0 .7rem;
  min-height: 46px;
}

.hub-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
}

.hub-card-footer .btn {
  padding: .5rem .85rem;
  font-size: .88rem;
}

@media (max-width: 900px) {
  .hub-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .hub-search-form {
    grid-template-columns: 1fr;
  }

  .hub-card-media {
    height: 190px;
  }
}

.feed-hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.post-image {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-top: .6rem;
  object-fit: cover;
  max-height: 420px;
}

.post-actions-row {
  display: flex;
  align-items: center;
  gap: .55rem;
  margin-top: .8rem;
}

.icon-action {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .45rem .72rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}

.icon-action svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.like-action {
  color: #ef5a8c;
}

.comment-action {
  color: #7cb5ff;
}

.comment-composer {
  margin-top: .75rem;
  padding-top: .65rem;
  border-top: 1px solid var(--border);
}

.comment-composer textarea {
  min-height: 90px;
}

@media (max-width: 720px) {
  .feed-hero {
    flex-direction: column;
    align-items: flex-start;
  }
}

.lesson-text-content {
  white-space: pre-wrap;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: .9rem;
  background: color-mix(in srgb, var(--card) 70%, transparent);
}

.admin-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: .9rem;
}

.admin-tab {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}

.admin-tab.is-active {
  background: color-mix(in srgb, var(--accent) 35%, transparent);
}

.admin-tab-panel {
  margin-bottom: 1rem;
}

.admin-subtabs {
  margin-top: 1rem;
}

.classroom-course-panel {
  margin-top: 1rem;
}


.classroom-course-actions {
  display: flex;
  gap: .6rem;
  align-items: center;
}

.modal-actions {
  margin-top: .8rem;
  display: flex;
  gap: .6rem;
  justify-content: flex-end;
}

.lesson-overview {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: .8rem;
  margin: .8rem 0;
}

.lesson-overview h5 {
  margin: 0 0 .6rem 0;
}

.lesson-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .4rem;
}

.lesson-toc-link {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}

.lesson-toc-link.is-active {
  background: color-mix(in srgb, var(--accent) 30%, transparent);
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
}

.lesson-list {
  list-style: none;
  padding-left: 0;
  margin: 1rem 0 0;
}

.lesson-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: .85rem;
  margin-bottom: 1rem;
}

.lesson-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  margin-bottom: .5rem;
}

.lesson-keep-pdf-toggle {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  margin: 0;
}

.lesson-form {
  margin: 0;
}

.lesson-actions {
  margin-top: .75rem;
}

.lesson-delete-form {
  margin-top: .6rem;
}

.classroom-course-list {
  display: grid;
  gap: 1rem;
}

.classroom-course-tile-link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.classroom-layout {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.classroom-sidebar {
  position: sticky;
  top: 1rem;
}

.classroom-toc {
  list-style: none;
  padding: 0;
  margin: .8rem 0 0;
  display: grid;
  gap: .45rem;
}

.classroom-toc-item a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: .5rem;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: .55rem .65rem;
}

.classroom-toc-item.is-active a {
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
  background: color-mix(in srgb, var(--accent) 24%, transparent);
}

.admin-course-image-preview {
  width: 100%;
  max-height: 180px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--border);
}

@media (max-width: 900px) {
  .classroom-layout {
    grid-template-columns: 1fr;
  }

  .classroom-sidebar {
    position: static;
  }
}