/* ============================================================
   Aven Academy — "Study Loud" GLASS edition (beta)
   Glassmorphism: frosted translucent surfaces over a soft gradient-mesh
   backdrop. Palette unchanged so brand stays recognizable:
     Ink Navy #14162B · Paper Cream #FBF4E9
     Highlighter Yellow #FFD23F · Marker Pink #FF4D8D · Mint #2FBF89
   Type: Sora (display) + Inter (body)
   ============================================================ */

:root {
  --ink: #14162B;
  --paper: #FBF4E9;
  --paper-2: #F3EBDC;
  --yellow: #FFD23F;
  --pink: #FF4D8D;
  --mint: #2FBF89;
  --line: #E7DDC8;
  --radius: 20px;
  --shadow: 0 12px 34px -14px rgba(20,22,43,0.28);

  /* glass surfaces */
  --glass-bg: rgba(255,255,255,0.5);
  --glass-bg-strong: rgba(255,255,255,0.72);
  --glass-border: rgba(255,255,255,0.65);
  --glass-blur: blur(18px) saturate(160%);
  --glass-dark-bg: rgba(20,22,43,0.55);
  --glass-dark-border: rgba(255,255,255,0.14);
}

/* ---------- dark theme ---------- */
[data-theme="dark"] {
  --paper: #0F1120;
  --paper-2: #1B1D33;
  --line: #2B2D48;
  --glass-bg: rgba(30,32,54,0.6);
  --glass-bg-strong: rgba(30,32,54,0.8);
  --glass-border: rgba(255,255,255,0.1);
}
[data-theme="dark"] body { color: #F1F1F7; }
[data-theme="dark"] body {
  background-image:
    radial-gradient(720px 480px at 92% -6%, rgba(255,210,63,.16), transparent 60%),
    radial-gradient(640px 460px at -8% 18%, rgba(255,77,141,.14), transparent 60%),
    radial-gradient(760px 520px at 50% 115%, rgba(47,191,137,.12), transparent 60%),
    radial-gradient(480px 420px at 105% 60%, rgba(91,42,134,.14), transparent 60%);
}
[data-theme="dark"] .hero p { color: #C7C8DE; }
[data-theme="dark"] .post-card .excerpt, [data-theme="dark"] .post-card .meta { color: #A9AAC4; }
[data-theme="dark"] .article-body { color: #EAEAF4; }
[data-theme="dark"] .article-body th, [data-theme="dark"] .article-body td { border-color: var(--line); color: #EAEAF4; }
[data-theme="dark"] .btn-outline { color: #F1F1F7; border-color: #F1F1F7; }
[data-theme="dark"] .field input, [data-theme="dark"] .field select, [data-theme="dark"] .field textarea {
  background: rgba(255,255,255,.06); color: #F1F1F7; border-color: var(--glass-border);
}
[data-theme="dark"] .tag-row span { background: var(--paper-2); color: #EAEAF4; }
[data-theme="dark"] .cat-icon-badge { color: #F1F1F7; }
[data-theme="dark"] .empty-state { color: #A9AAC4; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.55;
  padding-bottom: 100px; /* room for floating bottom nav */
  min-height: 100vh;
  /* soft gradient-mesh backdrop — this is what makes glass surfaces read as "glass" */
  background-color: var(--paper);
  background-image:
    radial-gradient(720px 480px at 92% -6%, rgba(255,210,63,.55), transparent 60%),
    radial-gradient(640px 460px at -8% 18%, rgba(255,77,141,.30), transparent 60%),
    radial-gradient(760px 520px at 50% 115%, rgba(47,191,137,.28), transparent 60%),
    radial-gradient(480px 420px at 105% 60%, rgba(91,42,134,.18), transparent 60%);
  background-attachment: fixed;
  background-repeat: no-repeat;
}
h1, h2, h3, .display {
  font-family: 'Sora', 'Inter', sans-serif;
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 .5em;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ---------- highlighter-underline signature ---------- */
.hl {
  background: linear-gradient(to top, var(--yellow) 38%, transparent 38%);
  padding: 0 .1em;
}

/* ---------- icon system ---------- */
.icon { width: 22px; height: 22px; flex: none; }
.icon-sm { width: 17px; height: 17px; flex: none; }
.icon-lg { width: 30px; height: 30px; flex: none; }

/* ---------- top bar (glass) ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  background: var(--glass-dark-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-dark-border);
  color: var(--paper);
}
.brand { display: flex; align-items: center; gap: 10px; font-family: 'Sora'; font-weight: 800; font-size: 1.1rem; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: var(--yellow); color: var(--ink);
  display: grid; place-items: center; transform: rotate(-6deg);
  box-shadow: 0 4px 14px -4px rgba(255,210,63,.6);
}
.brand-mark .icon { width: 20px; height: 20px; }
.brand-beta {
  font-size: .62rem; font-weight: 800; letter-spacing: .05em; text-transform: uppercase;
  background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.3);
  padding: 2px 8px; border-radius: 999px; margin-left: 2px; color: var(--yellow);
}
.topnav { display: none; gap: 20px; font-weight: 600; font-size: .88rem; align-items: center; }
.topnav a { display: flex; align-items: center; gap: 6px; }
.topnav a:hover { color: var(--yellow); }
.topnav a.demo-link { background: rgba(37,211,102,.9); color: #fff; padding: 7px 14px; border-radius: 999px; font-weight: 700; backdrop-filter: blur(6px); }
.topnav a.demo-link:hover { background: #1fb857; color: #fff; }
.cart-pill {
  background: rgba(255,77,141,.85); backdrop-filter: blur(6px);
  color: #fff; font-weight: 700; font-size: .85rem;
  padding: 8px 12px; border-radius: 999px; display: flex; gap: 6px; align-items: center;
}
@media (min-width: 860px) { .topnav { display: flex; } }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 56px 20px 40px;
  text-align: left;
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -60px; right: -60px; width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(255,210,63,.55), transparent 70%);
  filter: blur(6px); z-index: 0; border-radius: 50%;
}
.hero::after {
  content: ''; position: absolute; bottom: -80px; left: -40px; width: 220px; height: 220px;
  background: radial-gradient(circle, rgba(255,77,141,.35), transparent 70%);
  filter: blur(6px); z-index: 0; border-radius: 50%;
}
.hero > * { position: relative; z-index: 1; }
.hero .eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--glass-dark-bg); backdrop-filter: var(--glass-blur); border: 1px solid var(--glass-dark-border);
  color: var(--yellow);
  font-weight: 700; font-size: .75rem; letter-spacing: .06em; text-transform: uppercase;
  padding: 7px 14px; border-radius: 999px; margin-bottom: 16px;
}
.hero h1 { font-size: clamp(1.8rem, 5vw, 3rem); max-width: 16ch; }
.hero p { max-width: 46ch; font-size: 1.05rem; color: #3c3d55; }

/* ---------- section shell ---------- */
.section { padding: 32px 20px; max-width: 1080px; margin: 0 auto; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.section-head h2 { font-size: 1.5rem; }

/* ---------- category chips (glass pills) ---------- */
.chip-row { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 6px; -webkit-overflow-scrolling: touch; }
.chip {
  flex: none; padding: 9px 16px; border-radius: 999px; font-weight: 700; font-size: .85rem;
  background: var(--glass-bg); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border); box-shadow: 0 6px 18px -12px rgba(20,22,43,.35);
  transition: transform .15s ease, background .15s ease;
}
.chip.active, .chip:hover { background: var(--yellow); border-color: var(--yellow); transform: translateY(-1px); }

/* ---------- glass card base ---------- */
.post-card, .product-card, .form-card, .promo-block {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- blog card grid ---------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.post-card { overflow: hidden; display: flex; flex-direction: column; transition: transform .18s ease, box-shadow .18s ease; }
.post-card:hover { transform: translateY(-4px); box-shadow: 0 18px 40px -16px rgba(20,22,43,.4); }
.post-card .thumb { aspect-ratio: 16/9; object-fit: cover; background: var(--paper-2); }
.post-card .body { padding: 16px 18px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.post-card .cat-tag {
  align-self: flex-start; font-size: .7rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .04em; background: var(--pink); color: #fff; padding: 3px 10px; border-radius: 999px;
}
.post-card h3 { font-size: 1.08rem; }
.post-card .excerpt { color: #55566e; font-size: .92rem; flex: 1; }
.post-card .meta { font-size: .78rem; color: #6c6d86; display: flex; justify-content: space-between; }
.image-credit { font-size: .68rem; color: #7d7e96; padding: 4px 18px 0; }
.save-btn {
  position: absolute; top: 10px; right: 10px; z-index: 5;
  width: 34px; height: 34px; border-radius: 999px;
  background: var(--glass-dark-bg); backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-dark-border);
  color: #fff; display: grid; place-items: center;
}
.save-btn:hover { background: var(--pink); }
.save-btn-inline { display: inline-flex; align-items: center; gap: 6px; }
.cat-icon-badge {
  display: inline-grid; place-items: center; width: 46px; height: 46px; border-radius: 12px;
  background: var(--glass-bg-strong); border: 1px solid var(--glass-border); color: var(--ink);
}

/* ---------- product cards ---------- */
.product-card { overflow: hidden; display: flex; flex-direction: column; }
.product-card .thumb { aspect-ratio: 4/3; object-fit: cover; }
.product-card .body { padding: 16px 18px 20px; display: flex; flex-direction: column; gap: 8px; }
.badge-type { align-self: flex-start; font-size: .68rem; font-weight: 800; text-transform: uppercase; padding: 3px 9px; border-radius: 999px; }
.badge-type.digital { background: rgba(47,191,137,.2); color: #146648; }
.badge-type.physical { background: rgba(255,77,141,.2); color: #a91f57; }
.price-row { display: flex; align-items: baseline; gap: 8px; }
.price-now { font-family: 'Sora'; font-weight: 800; font-size: 1.25rem; }
.price-mrp { text-decoration: line-through; color: #9596ac; font-size: .88rem; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 700; font-size: .92rem; padding: 12px 18px; border-radius: 14px;
  border: none; cursor: pointer; text-align: center;
}
.btn-primary { background: var(--ink); color: var(--yellow); box-shadow: 0 10px 24px -10px rgba(20,22,43,.55); }
.btn-primary:hover { background: #24274a; }
.btn-whatsapp { background: rgba(37,211,102,.92); backdrop-filter: blur(6px); color: #fff; }
.btn-paypal { background: rgba(0,48,135,.92); backdrop-filter: blur(6px); color: #fff; }
.btn-outline {
  background: var(--glass-bg); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border: 1.5px solid var(--ink); color: var(--ink);
}
.btn-block { width: 100%; }

/* ---------- article page ---------- */
.article-head { padding: 30px 20px 10px; max-width: 780px; margin: 0 auto; }
.article-head .cat-tag { background: var(--pink); color: #fff; font-size: .72rem; font-weight: 800; padding: 4px 10px; border-radius: 999px; text-transform: uppercase; }
.article-head h1 { font-size: clamp(1.6rem, 4.2vw, 2.4rem); margin-top: 10px; }
.article-cover {
  max-width: 900px; margin: 20px auto; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); border: 1px solid var(--glass-border);
}
.article-body {
  max-width: 780px; margin: 0 auto 30px; padding: 28px 26px; font-size: 1.05rem;
  background: var(--glass-bg-strong); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.article-body h2 { margin-top: 1.6em; font-size: 1.4rem; }
.article-body h3 { margin-top: 1.2em; font-size: 1.15rem; }
.article-body table { width: 100%; border-collapse: collapse; margin: 1.2em 0; }
.article-body th, .article-body td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; font-size: .95rem; }
.article-body ul { padding-left: 1.2em; }
.article-body blockquote {
  background: linear-gradient(135deg, rgba(255,210,63,.22), rgba(255,77,141,.1));
  border-left: 4px solid var(--yellow); border-radius: 0 12px 12px 0;
  padding: 14px 18px; margin: 1.4em 0; font-size: 1rem; color: #2a2b45;
}
.article-body .mermaid {
  background: rgba(255,255,255,.85); border: 1px solid var(--glass-border); border-radius: 14px;
  padding: 20px; margin: 1.6em 0; display: flex; justify-content: center; overflow-x: auto;
}
.tag-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 24px; }
.tag-row span { background: var(--paper-2); border-radius: 999px; padding: 5px 12px; font-size: .78rem; font-weight: 600; }

/* ---------- promo block (cross-promotion) ---------- */
.promo-block { margin-top: 26px; padding: 18px 20px; }
.promo-label { display: flex; align-items: center; gap: 6px; font-weight: 700; font-size: .8rem; color: #55566e; text-transform: uppercase; letter-spacing: .04em; margin-bottom: 10px; }
.promo-links { display: flex; gap: 10px; flex-wrap: wrap; }
.promo-chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: 999px;
  font-weight: 700; font-size: .82rem; background: rgba(255,255,255,.7); border: 1px solid var(--glass-border);
  color: var(--ink);
}
.promo-chip:hover { background: var(--yellow); }
.promo-chip-ig { background: linear-gradient(135deg, #f9ce34, #ee2a7b, #6228d7); color: #fff; border: none; }
.promo-chip-ig:hover { opacity: .9; background: linear-gradient(135deg, #f9ce34, #ee2a7b, #6228d7); }
.promo-chip-li { background: #0A66C2; color: #fff; border: none; }
.promo-chip-li:hover { background: #0958a8; }

/* ---------- forms ---------- */
.form-card { padding: 24px; max-width: 480px; margin: 0 auto; }
.field { margin-bottom: 14px; }
.field label { display: block; font-weight: 600; font-size: .85rem; margin-bottom: 5px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 13px; border-radius: 10px; border: 1.5px solid var(--glass-border);
  font-family: inherit; font-size: .95rem; background: rgba(255,255,255,.6);
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--ink); border-color: var(--ink); }
.alert { padding: 12px 14px; border-radius: 10px; font-size: .9rem; margin-bottom: 14px; }
.alert-error { background: rgba(254,226,226,.9); color: #991B1B; }
.alert-success { background: rgba(220,252,231,.9); color: #166534; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--glass-dark-bg); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--glass-dark-border);
  color: var(--paper); padding: 40px 20px 30px; margin-top: 40px;
}
.footer-inner { max-width: 700px; margin: 0 auto; text-align: center; }
.footer-brand { font-family: 'Sora'; font-weight: 800; font-size: 1.2rem; }
.footer-tag { color: #b9bad0; font-size: .92rem; max-width: 40ch; margin: 8px auto 18px; }
.footer-inner .promo-block { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.16); text-align: left; margin-bottom: 20px; }
.footer-inner .promo-label { color: #d7d8ea; }
.footer-inner .promo-chip { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.2); color: #fff; }
.footer-links { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; font-size: .85rem; margin-bottom: 14px; }
.footer-links a:hover { color: var(--yellow); }
.footer-copy { font-size: .75rem; color: #9394ac; }

/* ---------- floating glass bottom nav ---------- */
.bottom-nav {
  position: fixed; bottom: 14px; left: 14px; right: 14px; z-index: 50;
  display: flex; justify-content: space-around; align-items: center;
  background: var(--glass-dark-bg);
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-dark-border);
  border-radius: 22px;
  padding: 10px 6px calc(10px + env(safe-area-inset-bottom));
  box-shadow: 0 14px 36px -14px rgba(20,22,43,.55);
  max-width: 520px; margin: 0 auto;
}
.bn-item { display: flex; flex-direction: column; align-items: center; gap: 3px; font-size: .64rem; font-weight: 600; color: #b9bad0; flex: 1; padding: 4px; border-radius: 12px; }
.bn-icon { width: 21px; height: 21px; }
.bn-item.active, .bn-item:hover { color: var(--yellow); }
.bn-item.active { background: rgba(255,255,255,.08); }
@media (min-width: 860px) { .bottom-nav { display: none; } body { padding-bottom: 0; } }

/* ---------- misc utility ---------- */
.empty-state { text-align: center; padding: 60px 20px; color: #6c6d86; }
.pill-nav { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- account tab: native-app style ---------- */
.account-header { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; }
.account-avatar {
  width: 58px; height: 58px; border-radius: 50%; background: var(--ink); color: var(--yellow);
  display: grid; place-items: center; font-family: 'Sora'; font-weight: 800; font-size: 1.3rem; flex: none;
}
.account-menu { border-radius: var(--radius); overflow: hidden; background: var(--glass-bg); backdrop-filter: var(--glass-blur); border: 1px solid var(--glass-border); box-shadow: var(--shadow); margin-bottom: 16px; }
.account-row {
  display: flex; align-items: center; gap: 12px; padding: 15px 18px;
  border-bottom: 1px solid var(--glass-border); font-weight: 600; font-size: .95rem;
}
.account-row:last-child { border-bottom: none; }
.account-row .row-icon { width: 20px; height: 20px; flex: none; color: var(--ink); }
[data-theme="dark"] .account-row .row-icon { color: #F1F1F7; }
.account-row .row-label { flex: 1; }
.account-row .row-meta { font-size: .8rem; color: #8b8ca3; font-weight: 500; }
.account-row.link-row { cursor: pointer; }
.account-row.link-row:hover { background: rgba(255,210,63,.12); }
.account-row.danger { color: #c72564; }
.account-row.danger .row-icon { color: #c72564; }

.toggle-switch { position: relative; width: 46px; height: 26px; flex: none; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0; background: #d8d9e6; border-radius: 999px; cursor: pointer; transition: background .2s ease;
}
.toggle-slider::before {
  content: ''; position: absolute; width: 20px; height: 20px; left: 3px; top: 3px; background: #fff; border-radius: 50%;
  transition: transform .2s ease; box-shadow: 0 1px 3px rgba(0,0,0,.3);
}
.toggle-switch input:checked + .toggle-slider { background: var(--ink); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }