/* ==========================================================================
   04 · LAYOUT — yuqori panel, navigatsiya, hero, boʻlim sarlavhalari, futer
   ========================================================================== */

/* ============ OʻQISH PROGRESSI ============ */
.progress-rail {
  position: fixed;
  inset: 0 0 auto 0;
  height: 4px;
  background: transparent;
  z-index: 60;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--blue), var(--violet), var(--green));
  transition: width .1s linear;
}

/* ============ YUQORI PANEL ============ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--surface) 90%, transparent),
    color-mix(in srgb, var(--surface) 74%, transparent));
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 80%, transparent);
  box-shadow: 0 1px 0 0 var(--hi) inset, 0 10px 30px -22px rgba(23, 43, 84, .5);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: var(--topbar-h);
}

.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--grad-brand);
  color: #fff;
  font-weight: 800;
  line-height: 1;
  box-shadow:
    0 1px 0 0 rgba(255, 255, 255, .5) inset,
    0 8px 18px -8px color-mix(in srgb, var(--blue) 70%, transparent);
  transition: transform .35s var(--ease);
}
.brand:hover .brand-mark { transform: translateY(-1px) rotate(-4deg) scale(1.04); }
.brand-text {
  display: flex;
  flex-direction: column;
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: -.01em;
}
.brand-text small { font-weight: 600; font-size: .68rem; color: var(--ink-2); letter-spacing: .04em; }

/* ---------- navigatsiya ---------- */
.nav {
  display: flex;
  gap: 2px;
  flex: 1;
  flex-wrap: wrap;
  justify-content: center;
}
.nav a {
  padding: 7px 11px;
  border-radius: 9px;
  font-size: .88rem;
  font-weight: 600;
  color: var(--ink-2);
  white-space: nowrap;
  transition: background .22s var(--ease), color .22s var(--ease), transform .22s var(--ease);
}
.nav a:hover { background: var(--surface-2); color: var(--ink); transform: translateY(-1px); }
.nav a.active {
  background: color-mix(in srgb, var(--blue) 12%, transparent);
  color: var(--blue);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--blue) 24%, transparent) inset;
}

/* ---------- asboblar ---------- */
.topbar-tools { display: flex; gap: 8px; align-items: center; flex-shrink: 0; }
.tool {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border-radius: 11px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: .84rem;
  font-weight: 700;
  color: var(--ink-2);
  box-shadow: var(--elev-1);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease),
              border-color .2s var(--ease), color .2s var(--ease);
}
.tool:hover { transform: translateY(-2px); border-color: var(--blue); color: var(--blue); box-shadow: var(--elev-hover); }
.tool:active { transform: translateY(0); }
.tool.icon { padding: 9px 11px; font-size: 1rem; }
.tool[aria-pressed="true"] {
  background: var(--grad-gold);
  color: #3a2600;
  border-color: transparent;
  box-shadow:
    0 1px 0 0 rgba(255, 255, 255, .45) inset,
    0 10px 22px -12px color-mix(in srgb, var(--amber) 90%, transparent);
}
.rules-btn {
  background: var(--grad-gold);
  color: #3a2600;
  border-color: transparent;
}
.rules-btn:hover { filter: brightness(1.05); color: #3a2600; }
.nav-toggle { display: none; }

/* ============ OʻQITUVCHI BANNERI ============ */
.teacher-banner {
  display: none;
  background: linear-gradient(135deg, #fff4d9, #ffe8bd);
  color: #7a4c00;
  border-bottom: 1px solid #f2cf8a;
  padding: 10px 20px;
  text-align: center;
  font-size: .92rem;
  position: sticky;
  top: var(--topbar-h);
  z-index: 40;
}
body.teacher .teacher-banner { display: block; }
html[data-theme="dark"] .teacher-banner { background: #3a2c0d; color: #ffd68a; border-color: #5c4715; }

/* ============ HERO ============ */
.hero { padding: 66px 0 34px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  gap: 40px;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(3rem, 8vw, 5.6rem);
  font-weight: 900;
  letter-spacing: -.03em;
  margin: 0 0 12px;
  background: linear-gradient(120deg, var(--blue), var(--violet) 48%, var(--pink) 92%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: heroSheen 9s ease-in-out infinite;
  filter: drop-shadow(0 12px 30px color-mix(in srgb, var(--violet) 22%, transparent));
}
@keyframes heroSheen { 0%, 100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }
.hero-copy h1 .dot { color: var(--amber); -webkit-text-fill-color: var(--amber); }

.lead { font-size: 1.1rem; color: var(--ink-2); max-width: 640px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 24px 0 26px; }

.stats { display: flex; gap: 12px; flex-wrap: wrap; }
.stat {
  position: relative;
  overflow: hidden;
  flex: 1 1 120px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 14px 16px;
  box-shadow: var(--elev-1);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease);
}
.stat::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  height: 3px; width: 100%;
  background: var(--grad-brand);
  opacity: .85;
}
.stat:hover { transform: translateY(-3px); box-shadow: var(--elev-hover); }
.stat b {
  display: block;
  font-size: 1.9rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(120deg, var(--blue), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat span { font-size: .82rem; color: var(--ink-2); }

/* ---------- maskot ---------- */
.mascot {
  position: relative;
  overflow: hidden;
  margin: 0;
  padding: 18px 18px 22px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--blue) 10%, transparent), transparent 62%),
    var(--surface);
  box-shadow: var(--elev-2);
}
.mascot-stage {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 1;
}
.mascot-halo {
  position: absolute;
  inset: 4%;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 46%,
    color-mix(in srgb, var(--blue) 26%, transparent),
    color-mix(in srgb, var(--violet) 14%, transparent) 52%,
    transparent 70%);
  filter: blur(10px);
}
.mascot-ring {
  position: absolute;
  width: 88%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: conic-gradient(from 200deg,
    var(--blue), var(--violet), var(--pink), var(--amber), var(--green), var(--blue));
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 0);
  mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 0);
  opacity: .55;
  animation: ringSpin 22s linear infinite;
}
@keyframes ringSpin { to { transform: rotate(360deg); } }

.mascot-img {
  position: relative;
  width: 96%;
  max-width: 330px;
  height: auto;
  display: block;
  border-radius: 20px;
  animation: bob 5s ease-in-out infinite;
  filter: drop-shadow(0 18px 26px rgba(23, 43, 84, .26));
}
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-9px); } }
html[data-theme="dark"] .mascot-img { filter: drop-shadow(0 18px 30px rgba(0, 0, 0, .6)); }

.mascot-fallback { display: none; }
.mascot.no-img .mascot-stage { display: none; }
.mascot.no-img .mascot-fallback {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 auto;
  animation: bob 4s ease-in-out infinite;
}

/* maskot yonidagi kasr yorligʻi */
.mascot-chip {
  position: absolute;
  right: 4%; bottom: 6%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px; height: 54px;
  padding: 0 8px;
  border-radius: 18px;
  background: color-mix(in srgb, var(--surface) 84%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid color-mix(in srgb, var(--amber) 45%, var(--line));
  box-shadow: var(--elev-2);
  color: var(--amber-dk);
  font-size: 1.15rem;
  animation: bob 5s ease-in-out infinite reverse;
}
html[data-theme="dark"] .mascot-chip { color: var(--amber); }

.mascot figcaption { margin-top: 8px; }
.mascot figcaption strong {
  display: block;
  font-size: 1.4rem;
  letter-spacing: -.01em;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.mascot figcaption span { font-size: .9rem; color: var(--ink-2); font-style: italic; }

/* ============ BOʻLIM SARLAVHALARI ============ */
.chapter { padding: 50px 0 10px; }
.ch-head { margin-bottom: 26px; }
.ch-num {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--grad-gold);
  color: #3a2600;
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  box-shadow:
    0 1px 0 0 rgba(255, 255, 255, .45) inset,
    0 10px 22px -12px color-mix(in srgb, var(--amber) 90%, transparent);
}
.ch-head h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  font-weight: 900;
  letter-spacing: -.02em;
  margin: 12px 0 8px;
  background: linear-gradient(120deg, var(--ink), color-mix(in srgb, var(--ink) 62%, var(--blue)));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.ch-sub { color: var(--ink-2); font-size: 1.02rem; max-width: 780px; }

.sub-title {
  position: relative;
  font-size: 1.22rem;
  margin: 34px 0 12px;
  padding-left: 16px;
  line-height: 1.35;
}
.sub-title::before {
  content: "";
  position: absolute;
  left: 0; top: .18em; bottom: .18em;
  width: 5px;
  border-radius: 999px;
  background: var(--grad-brand);
}

.ch-toc {
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: var(--r-md);
  background: var(--surface-2);
  border: 1px dashed var(--line);
  font-size: .9rem;
  color: var(--ink-2);
}
.ch-toc span { font-weight: 800; color: var(--ink); margin-right: 6px; }
.ch-toc b { color: var(--blue); }

/* ============ FUTER ============ */
.footer {
  position: relative;
  overflow: hidden;
  margin-top: 60px;
  padding: 40px 0 24px;
  color: #e6edfb;
  background:
    radial-gradient(900px 380px at 12% -30%, rgba(47, 111, 237, .34), transparent 62%),
    radial-gradient(760px 340px at 88% 120%, rgba(123, 97, 255, .3), transparent 60%),
    linear-gradient(135deg, #141c33, #0c1220);
}
.footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .35), transparent);
}
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; }
.footer h3 {
  font-size: 1.5rem;
  background: linear-gradient(120deg, #fff, #b9cdff 60%, #d8c7ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.footer p { color: rgba(230, 237, 251, .78); max-width: 620px; margin: 0; }
.footer-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.footer .btn-ghost { background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .18); color: #fff; }
.footer-note {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, .12);
  font-size: .85rem;
  color: rgba(230, 237, 251, .6);
  text-align: center;
}

/* ============ "YUQORIGA" TUGMASI ============ */
.fab {
  position: fixed;
  right: 22px; bottom: 22px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--grad-brand);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 800;
  z-index: 45;
  box-shadow:
    0 1px 0 0 rgba(255, 255, 255, .3) inset,
    0 14px 30px -12px color-mix(in srgb, var(--blue) 90%, transparent),
    0 0 0 0 color-mix(in srgb, var(--blue) 45%, transparent);
  transition: transform .25s var(--ease), box-shadow .35s var(--ease);
}
.fab:hover {
  transform: translateY(-3px) scale(1.06);
  box-shadow:
    0 1px 0 0 rgba(255, 255, 255, .34) inset,
    0 18px 36px -12px color-mix(in srgb, var(--blue) 90%, transparent),
    0 0 0 10px color-mix(in srgb, var(--blue) 14%, transparent);
}