/* ============================================================
   BRILLIANTINKK.COM — AI Tutor Universe
   Premium child-safe learning platform
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&family=Fredoka+One&family=Poppins:wght@400;600;700;800&display=swap');

:root {
  --bik-navy:    #0b102f;
  --bik-navy2:   #141b45;
  --bik-violet:  #6d4cff;
  --bik-violet2: #9370ff;
  --bik-blue:    #2563eb;
  --bik-cyan:    #08c8ff;
  --bik-mint:    #22d39e;
  --bik-amber:   #ffb633;
  --bik-rose:    #ff5f9d;
  --bik-ink:     #18203f;
  --bik-muted:   #8892b0;
  --bik-paper:   #ffffff;
  --bik-glass:   rgba(255,255,255,0.10);
  --bik-glass2:  rgba(255,255,255,0.75);
  --bik-border:  rgba(160,180,255,0.28);
  --bik-glow:    0 20px 60px rgba(109,76,255,0.25);
}

/* ── Reset ─────────────────────────────────────────────────── */
.bik-wrap, .bik-wrap * { box-sizing: border-box; }
.bik-wrap { font-family: 'Nunito', 'Poppins', system-ui, sans-serif; }
.bik-wrap button, .bik-wrap input, .bik-wrap select { font-family: inherit; }

/* ── Starfield body ─────────────────────────────────────────── */
.bik-wrap {
  position: relative;
  min-height: 100vh;
  background: radial-gradient(ellipse at 18% 0%, #1a1060 0%, transparent 38%),
              radial-gradient(ellipse at 82% 10%, #0e2a6e 0%, transparent 35%),
              linear-gradient(160deg, #06091a 0%, #0b102f 40%, #0d1535 100%);
  color: #e8eeff;
  overflow-x: hidden;
}

/* Stars */
.bik-wrap::before {
  content: '';
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 12% 18%, #ffffffaa, transparent),
    radial-gradient(1.5px 1.5px at 34% 6%,  #ffffffbb, transparent),
    radial-gradient(1px   1px   at 55% 22%, #ffffff88, transparent),
    radial-gradient(2px   2px   at 73% 8%,  #ffffffcc, transparent),
    radial-gradient(1px   1px   at 88% 31%, #ffffff77, transparent),
    radial-gradient(1.5px 1.5px at 6%  44%, #ffffffaa, transparent),
    radial-gradient(1px   1px   at 20% 62%, #ffffff66, transparent),
    radial-gradient(2px   2px   at 46% 55%, #ffffffbb, transparent),
    radial-gradient(1.5px 1.5px at 64% 70%, #ffffff99, transparent),
    radial-gradient(1px   1px   at 80% 48%, #ffffff77, transparent),
    radial-gradient(2px   2px   at 93% 62%, #ffffffcc, transparent),
    radial-gradient(1.5px 1.5px at 28% 84%, #ffffff88, transparent),
    radial-gradient(1px   1px   at 70% 88%, #ffffffaa, transparent),
    radial-gradient(1.5px 1.5px at 50% 95%, #ffffff77, transparent);
}

/* ── Top navbar ──────────────────────────────────────────────── */
.bik-nav {
  position: sticky; top: 0; z-index: 90;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 14px 24px;
  background: rgba(11,16,47,0.82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--bik-border);
  box-shadow: 0 4px 30px rgba(0,0,0,0.4);
}
.bik-logo {
  display: flex; align-items: center; gap: 12px; text-decoration: none;
}
.bik-logo-gem {
  width: 44px; height: 44px; border-radius: 16px; flex: none;
  background: linear-gradient(135deg, var(--bik-violet), var(--bik-cyan));
  display: grid; place-items: center;
  font-size: 22px;
  box-shadow: 0 8px 24px rgba(109,76,255,0.6), inset 0 1px 0 rgba(255,255,255,0.25);
}
.bik-logo-text {
  line-height: 1.1;
}
.bik-logo-name {
  font-family: 'Fredoka One', sans-serif;
  font-size: 1.45rem; color: #fff; letter-spacing: 0.5px;
}
.bik-logo-name span { color: var(--bik-cyan); }
.bik-logo-sub {
  font-size: 0.62rem; color: var(--bik-muted); letter-spacing: 3px;
  text-transform: uppercase; font-weight: 700;
}
.bik-safe-badge {
  margin-left: auto;
  background: linear-gradient(135deg, #0a3d62, #1e5ba8);
  border: 1px solid rgba(8,200,255,0.3);
  color: var(--bik-cyan);
  padding: 8px 16px; border-radius: 999px;
  font-size: 0.78rem; font-weight: 800; white-space: nowrap;
  box-shadow: 0 4px 14px rgba(8,200,255,0.2);
}
.bik-parent-notice {
  width: 100%;
  background: rgba(255,182,51,0.12);
  border: 1px solid rgba(255,182,51,0.3);
  border-radius: 12px; padding: 9px 14px;
  font-size: 0.82rem; font-weight: 700; color: var(--bik-amber);
  display: flex; align-items: center; gap: 8px;
}

/* ── Page layout ─────────────────────────────────────────────── */
.bik-layout {
  display: grid;
  grid-template-columns: 230px 1fr;
  grid-template-rows: auto;
  gap: 0;
  min-height: calc(100vh - 73px);
  position: relative; z-index: 1;
}

/* ── Sidebar ─────────────────────────────────────────────────── */
.bik-sidebar {
  background: rgba(255,255,255,0.04);
  border-right: 1px solid var(--bik-border);
  padding: 24px 16px;
  display: flex; flex-direction: column; gap: 24px;
}
.bik-sidebar-section { display: flex; flex-direction: column; gap: 6px; }
.bik-sidebar-label {
  font-size: 0.65rem; font-weight: 800; letter-spacing: 2px;
  text-transform: uppercase; color: var(--bik-muted); padding: 0 8px; margin-bottom: 4px;
}
.bik-nav-link {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px; border-radius: 14px;
  font-size: 0.9rem; font-weight: 700; color: rgba(232,238,255,0.65);
  cursor: pointer; transition: all 0.18s ease;
  border: 1px solid transparent;
  background: none; text-align: left; width: 100%;
}
.bik-nav-link:hover, .bik-nav-link.active {
  background: linear-gradient(135deg, rgba(109,76,255,0.2), rgba(8,200,255,0.1));
  border-color: rgba(109,76,255,0.35);
  color: #fff;
}
.bik-nav-link .nav-icon { font-size: 1.1rem; }

.bik-goal-card {
  background: linear-gradient(135deg, var(--bik-violet), #2249ee);
  border-radius: 18px; padding: 16px;
  box-shadow: 0 12px 30px rgba(109,76,255,0.4);
}
.bik-goal-card h4 { margin: 0 0 4px; font-size: 0.85rem; color: rgba(255,255,255,0.8); }
.bik-goal-card .goal-val { font-size: 1.1rem; font-weight: 800; color: #fff; margin-bottom: 10px; }
.bik-goal-bar { height: 8px; background: rgba(255,255,255,0.25); border-radius: 999px; overflow: hidden; }
.bik-goal-fill { height: 100%; background: var(--bik-mint); border-radius: 999px; width: 45%; }

/* ── Main content ────────────────────────────────────────────── */
.bik-main {
  padding: 28px 28px 60px;
  display: flex; flex-direction: column; gap: 28px;
}

/* ── Hero search ─────────────────────────────────────────────── */
.bik-hero {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--bik-border);
  border-radius: 28px; padding: 36px 36px 28px;
  position: relative; overflow: hidden;
  backdrop-filter: blur(10px);
  box-shadow: var(--bik-glow);
}
.bik-hero::before {
  content: '';
  position: absolute; top: -60px; right: -60px;
  width: 300px; height: 300px; border-radius: 50%;
  background: radial-gradient(circle, rgba(109,76,255,0.25), transparent 70%);
  pointer-events: none;
}
.bik-hero-deco { position: absolute; font-size: 2.2rem; opacity: 0.6; pointer-events: none; }
.bik-hero-deco.d1 { right: 100px; top: 18px; animation: bik-float 3.5s ease-in-out infinite; }
.bik-hero-deco.d2 { right: 50px; bottom: 24px; animation: bik-float 4.2s ease-in-out infinite 0.6s; }
.bik-hero-deco.d3 { right: 170px; bottom: 18px; animation: bik-float 5s ease-in-out infinite 1.2s; }

.bik-hero h1 {
  font-family: 'Fredoka One', sans-serif;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.05; margin: 0 0 10px;
  background: linear-gradient(90deg, #ffffff 0%, var(--bik-cyan) 40%, var(--bik-violet2) 80%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.bik-hero p {
  font-size: 1.02rem; color: rgba(180,194,255,0.85);
  max-width: 62ch; line-height: 1.55; margin: 0 0 22px;
}

/* search bar */
.bik-searchbar {
  display: flex; gap: 10px;
  background: rgba(255,255,255,0.08);
  border: 1.5px solid rgba(109,76,255,0.5);
  border-radius: 22px; padding: 8px 8px 8px 20px;
  box-shadow: 0 12px 35px rgba(109,76,255,0.2);
  backdrop-filter: blur(8px);
}
.bik-searchbar input {
  flex: 1; background: transparent; border: none; outline: none;
  font-size: 1.05rem; font-weight: 600; color: #fff;
}
.bik-searchbar input::placeholder { color: rgba(180,194,255,0.5); }
.bik-searchbar button {
  background: linear-gradient(135deg, var(--bik-violet), var(--bik-blue));
  color: #fff; border: none; border-radius: 16px;
  padding: 13px 22px; font-weight: 800; font-size: 0.95rem;
  cursor: pointer;
  box-shadow: 0 10px 22px rgba(109,76,255,0.45);
  transition: transform 0.15s, box-shadow 0.15s;
}
.bik-searchbar button:hover { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(109,76,255,0.6); }

/* filter row */
.bik-filters {
  display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px;
}
.bik-filters label {
  font-size: 0.68rem; font-weight: 800; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--bik-muted);
  display: block; margin-bottom: 4px;
}
.bik-filters .bik-filter-g { display: flex; flex-direction: column; }
.bik-filters select {
  background: rgba(255,255,255,0.07);
  border: 1.5px solid rgba(109,76,255,0.35);
  border-radius: 14px; padding: 10px 14px;
  color: #e8eeff; font-weight: 700; font-size: 0.88rem;
  cursor: pointer; min-width: 130px;
}
.bik-filters select option { background: #1a1060; color: #e8eeff; }
.bik-filter-grow { flex: 1; min-width: 200px; }
.bik-filter-grow input {
  width: 100%;
  background: rgba(255,255,255,0.07);
  border: 1.5px solid rgba(109,76,255,0.35);
  border-radius: 14px; padding: 10px 14px;
  color: #e8eeff; font-weight: 600; font-size: 0.9rem;
}
.bik-filter-grow input::placeholder { color: rgba(180,194,255,0.4); }

/* ── Subject chips ───────────────────────────────────────────── */
.bik-subjects {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 10px;
}
.bik-subject-chip {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--bik-border);
  border-radius: 16px; padding: 14px 10px;
  text-align: center; cursor: pointer;
  font-size: 0.82rem; font-weight: 800; color: rgba(232,238,255,0.8);
  transition: all 0.22s ease;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.bik-subject-chip:hover {
  background: linear-gradient(135deg, rgba(109,76,255,0.28), rgba(8,200,255,0.18));
  border-color: rgba(109,76,255,0.55);
  color: #fff;
  transform: translateY(-4px) rotate(-1deg);
  box-shadow: 0 14px 30px rgba(109,76,255,0.25);
}
.bik-subject-chip .chip-icon { font-size: 1.5rem; }

/* ── Section headers ─────────────────────────────────────────── */
.bik-section-head {
  display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px;
}
.bik-section-head h2 {
  font-family: 'Fredoka One', sans-serif;
  font-size: 1.5rem; margin: 0; color: #fff;
}
.bik-section-head .bik-count {
  font-size: 0.8rem; font-weight: 800; color: var(--bik-muted);
}

/* ── Tutor cards ─────────────────────────────────────────────── */
.bik-tutor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.atu-tutor-card {  /* keep original class for JS compat */
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--bik-border);
  border-radius: 22px; padding: 20px;
  display: flex; flex-direction: column; gap: 10px;
  transition: all 0.22s ease;
  position: relative; overflow: hidden;
  backdrop-filter: blur(8px);
}
.atu-tutor-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--tutor-color, linear-gradient(90deg, var(--bik-violet), var(--bik-cyan)));
  border-radius: 22px 22px 0 0;
}
.atu-tutor-card:hover {
  background: rgba(255,255,255,0.10);
  border-color: rgba(109,76,255,0.5);
  transform: translateY(-5px);
  box-shadow: 0 20px 50px rgba(109,76,255,0.3);
}
.atu-tutor-avatar {
  width: 58px; height: 58px; border-radius: 18px; flex: none;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.7rem; font-weight: 900;
  box-shadow: 0 8px 20px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.2);
}
.atu-tutor-card h3 { margin: 0; font-size: 1.08rem; font-weight: 800; color: #fff; }
.atu-tutor-subject { font-size: 0.72rem; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; color: var(--bik-muted); }
.atu-tutor-badge {
  align-self: flex-start;
  background: rgba(109,76,255,0.2);
  border: 1px solid rgba(109,76,255,0.35);
  border-radius: 999px; padding: 4px 12px;
  font-size: 0.7rem; font-weight: 800; color: var(--bik-violet2);
}
.atu-tutor-desc { font-size: 0.85rem; line-height: 1.45; color: rgba(180,194,255,0.75); flex: 1; }
.atu-tutor-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Lesson cards ────────────────────────────────────────────── */
.bik-lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}
.atu-lesson-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--bik-border);
  border-radius: 20px; padding: 18px;
  cursor: pointer; display: flex; flex-direction: column; gap: 8px;
  transition: all 0.2s ease;
  position: relative; overflow: hidden;
}
.atu-lesson-card::after {
  content: '▶';
  position: absolute; bottom: 14px; right: 16px;
  font-size: 0.75rem; color: var(--bik-muted);
  transition: transform 0.15s;
}
.atu-lesson-card:hover {
  background: rgba(109,76,255,0.12);
  border-color: rgba(109,76,255,0.45);
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(109,76,255,0.25);
}
.atu-lesson-card:hover::after { transform: translateX(3px); color: var(--bik-cyan); }
.atu-lesson-tag {
  align-self: flex-start;
  font-size: 0.68rem; font-weight: 800;
  padding: 4px 12px; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.tag-math  { background: rgba(109,76,255,0.3); color: #b39dff; border: 1px solid rgba(109,76,255,0.4); }
.tag-science { background: rgba(34,211,158,0.2); color: var(--bik-mint); border: 1px solid rgba(34,211,158,0.35); }
.tag-default { background: rgba(255,255,255,0.1); color: rgba(180,194,255,0.8); border: 1px solid var(--bik-border); }
.atu-lesson-card h4 { margin: 0; font-size: 1rem; font-weight: 800; color: #e8eeff; }
.atu-lesson-meta { font-size: 0.75rem; color: var(--bik-muted); font-weight: 700; }

/* ── Buttons ─────────────────────────────────────────────────── */
.atu-btn {
  font-family: 'Nunito', sans-serif;
  font-weight: 800; font-size: 0.88rem;
  border: 1.5px solid rgba(109,76,255,0.45);
  border-radius: 13px; padding: 9px 16px;
  background: rgba(255,255,255,0.07);
  color: #e8eeff; cursor: pointer;
  transition: all 0.15s;
}
.atu-btn:hover { background: rgba(109,76,255,0.2); border-color: rgba(109,76,255,0.6); }
.atu-btn:active { transform: scale(0.97); }
.atu-btn-primary {
  background: linear-gradient(135deg, var(--bik-violet), var(--bik-blue));
  border-color: transparent; color: #fff;
  box-shadow: 0 8px 20px rgba(109,76,255,0.4);
}
.atu-btn-primary:hover { box-shadow: 0 12px 28px rgba(109,76,255,0.6); }

/* ── Mascots ─────────────────────────────────────────────────── */
.bik-mascots { position: fixed; inset: 0; pointer-events: none; z-index: 50; }
.bik-mascot {
  position: absolute;
  display: flex; flex-direction: column; align-items: center;
}
.bik-mascot-body {
  width: 58px; height: 58px; border-radius: 20px;
  background: linear-gradient(145deg, rgba(255,255,255,0.95), rgba(220,228,255,0.9));
  border: 1px solid rgba(200,210,255,0.8);
  display: grid; place-items: center; font-size: 32px;
  box-shadow: inset -6px -6px 14px rgba(180,196,255,0.6),
              inset 6px 6px 14px rgba(255,255,255,0.9),
              0 16px 30px rgba(11,16,47,0.3);
  transform: rotateX(8deg);
  animation: bik-body3d 0.8s ease-in-out infinite alternate;
}
.bik-mascot-bubble {
  background: rgba(255,255,255,0.95);
  border: 1px solid rgba(180,196,255,0.8);
  border-radius: 999px; padding: 5px 10px;
  font-size: 0.7rem; font-weight: 900; color: #3a2fa0;
  white-space: nowrap; margin-top: 4px;
  box-shadow: 0 6px 16px rgba(11,16,47,0.2);
  animation: bik-bubble 2.5s ease-in-out infinite;
}
.bik-m-bot    { animation: bik-walk  18s linear     infinite; }
.bik-m-cat    { animation: bik-cat   14s ease-in-out infinite; }
.bik-m-owl    { animation: bik-owl   20s linear     infinite; }
.bik-m-bunny  { animation: bik-bunny 12s ease-in-out infinite; }
.bik-m-fox    { animation: bik-fox   16s ease-in-out infinite; }

/* ── Modal ───────────────────────────────────────────────────── */
.atu-modal {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(6,9,26,0.75);
  backdrop-filter: blur(10px);
  display: none; align-items: center; justify-content: center; padding: 20px;
}
.atu-modal.open { display: flex; }
.atu-modal-box {
  background: linear-gradient(160deg, #141b45 0%, #0d1232 100%);
  border: 1px solid rgba(109,76,255,0.4);
  border-radius: 26px;
  width: 100%; max-width: 860px; max-height: 92vh; overflow-y: auto;
  box-shadow: 0 40px 100px rgba(0,0,0,0.7), 0 0 0 1px rgba(109,76,255,0.2);
}
.atu-modal-head {
  display: flex; align-items: center; gap: 12px;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(109,76,255,0.25);
  background: rgba(109,76,255,0.08);
}
.atu-modal-head h3 {
  flex: 1; margin: 0;
  font-family: 'Fredoka One', sans-serif;
  font-size: 1.25rem; color: #fff;
}
.atu-close-btn {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1.5px solid rgba(109,76,255,0.4);
  background: rgba(109,76,255,0.15);
  color: #e8eeff; font-weight: 800; font-size: 1rem;
  cursor: pointer; transition: all 0.15s;
}
.atu-close-btn:hover { background: rgba(255,95,157,0.25); border-color: var(--bik-rose); color: var(--bik-rose); }

.atu-mode-tabs {
  display: flex; gap: 8px; padding: 16px 24px 0; flex-wrap: wrap;
}
.atu-tab {
  background: rgba(255,255,255,0.06);
  border: 1.5px solid rgba(109,76,255,0.3);
  border-radius: 999px; padding: 8px 18px;
  font-weight: 800; font-size: 0.85rem;
  color: rgba(180,194,255,0.75); cursor: pointer;
  transition: all 0.15s;
}
.atu-tab:hover { background: rgba(109,76,255,0.2); color: #fff; }
.atu-tab.active {
  background: linear-gradient(135deg, var(--bik-violet), var(--bik-blue));
  border-color: transparent; color: #fff;
  box-shadow: 0 6px 18px rgba(109,76,255,0.45);
}

.atu-pane { display: none; padding: 20px 24px 26px; }
.atu-pane.active { display: block; }

/* stage canvas */
#atu-stage {
  width: 100%; max-width: 100%; display: block;
  background: linear-gradient(160deg, #1a2a5e, #0d1535);
  border: 1.5px solid rgba(109,76,255,0.35);
  border-radius: 18px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.5);
}
.atu-caption-box {
  margin: 14px 0 0;
  background: rgba(255,255,255,0.05);
  border: 1.5px solid rgba(109,76,255,0.25);
  border-radius: 16px; padding: 14px 18px;
  display: flex; gap: 12px; align-items: flex-start;
}
.atu-caption-box .cap-speaker-dot {
  width: 36px; height: 36px; border-radius: 12px; flex: none;
  background: linear-gradient(135deg, var(--bik-violet), var(--bik-cyan));
  display: grid; place-items: center; font-size: 1.1rem;
}
#atu-speaker {
  display: block; font-size: 0.8rem; font-weight: 800;
  color: var(--bik-cyan); margin-bottom: 3px;
}
#atu-caption-text { margin: 0; font-size: 0.95rem; line-height: 1.5; color: rgba(220,228,255,0.9); }

.atu-controls-row {
  display: flex; gap: 10px; flex-wrap: wrap;
  justify-content: center; margin: 16px 0;
}
.atu-anim-note {
  font-size: 0.75rem; color: rgba(140,150,180,0.7);
  text-align: center; margin: 8px 0 0;
  font-style: italic;
}

/* chat pane */
.atu-chat-log {
  min-height: 140px; max-height: 280px; overflow-y: auto;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(109,76,255,0.2);
  border-radius: 16px; padding: 14px 16px;
  margin-bottom: 12px;
}
.atu-chat-log::-webkit-scrollbar { width: 4px; }
.atu-chat-log::-webkit-scrollbar-thumb { background: rgba(109,76,255,0.4); border-radius: 99px; }
.atu-chat-msg { margin-bottom: 10px; font-size: 0.92rem; line-height: 1.45; }
.atu-chat-msg.user {
  text-align: right;
  background: linear-gradient(135deg, var(--bik-violet), var(--bik-blue));
  color: #fff; border-radius: 14px 14px 4px 14px;
  padding: 8px 12px; display: inline-block; float: right; clear: both;
  max-width: 85%; font-weight: 700;
}
.atu-chat-msg.tutor {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(109,76,255,0.2);
  border-radius: 14px 14px 14px 4px;
  padding: 8px 12px; display: inline-block; float: left; clear: both;
  max-width: 85%; color: rgba(220,228,255,0.9); font-weight: 600;
}
.atu-chat-form {
  display: flex; gap: 10px; clear: both; margin-top: 4px;
}
.atu-chat-form input {
  flex: 1; background: rgba(255,255,255,0.06);
  border: 1.5px solid rgba(109,76,255,0.35);
  border-radius: 14px; padding: 10px 14px;
  font-size: 0.92rem; color: #e8eeff; font-weight: 600;
}
.atu-chat-form input::placeholder { color: rgba(180,194,255,0.4); }
.atu-chat-note {
  font-size: 0.75rem; color: var(--bik-muted);
  text-align: center; margin: 10px 0 0;
}

/* quiz pane */
.atu-quiz-q {
  background: rgba(255,255,255,0.05);
  border: 1.5px solid rgba(109,76,255,0.25);
  border-radius: 18px; padding: 16px 18px;
  margin-bottom: 12px;
}
.atu-quiz-q p { font-weight: 800; margin: 0 0 10px; font-size: 0.95rem; color: #e8eeff; }
.atu-quiz-q label {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.9rem; padding: 8px 10px; border-radius: 10px;
  cursor: pointer; color: rgba(200,210,255,0.85); font-weight: 600;
  transition: background 0.12s;
}
.atu-quiz-q label:hover { background: rgba(109,76,255,0.15); }
.atu-quiz-result {
  background: rgba(34,211,158,0.1);
  border: 1.5px solid rgba(34,211,158,0.35);
  border-radius: 16px; padding: 16px 18px;
  color: rgba(220,255,240,0.9); font-size: 0.9rem; line-height: 1.55;
  margin-top: 14px;
}

/* ── Floating mascot animations ───────────────────────────────── */
@keyframes bik-float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%       { transform: translateY(-12px) rotate(8deg); }
}
@keyframes bik-body3d {
  from { transform: rotateX(10deg) rotateY(-8deg) translateY(0); }
  to   { transform: rotateX(5deg)  rotateY(10deg) translateY(-8px); }
}
@keyframes bik-bubble {
  0%, 60%, 100% { transform: scale(0.95); opacity: 0.8; }
  30%           { transform: scale(1.05); opacity: 1; }
}
@keyframes bik-walk {
  0%   { left: 2%;  top: 72%; transform: rotateY(0deg);   }
  24%  { left: 75%; top: 72%; transform: rotateY(0deg);   }
  26%  { left: 75%; top: 72%; transform: rotateY(180deg); }
  74%  { left: 8%;  top: 20%; transform: rotateY(180deg); }
  76%  { left: 8%;  top: 20%; transform: rotateY(0deg);   }
  100% { left: 2%;  top: 72%; transform: rotateY(0deg);   }
}
@keyframes bik-cat {
  0%   { left: 10%; top: 80%; transform: rotateY(0deg) translateY(0); }
  30%  { left: 52%; top: 75%; transform: rotateY(0deg) translateY(-28px); }
  60%  { left: 82%; top: 82%; transform: rotateY(180deg); }
  100% { left: 10%; top: 80%; transform: rotateY(0deg); }
}
@keyframes bik-owl {
  0%   { left: 14%; top: 14%; transform: rotate(0deg); }
  33%  { left: 76%; top: 18%; transform: rotate(8deg); }
  66%  { left: 55%; top: 8%;  transform: rotate(-5deg); }
  100% { left: 14%; top: 14%; transform: rotate(0deg); }
}
@keyframes bik-bunny {
  0%   { right: 8%;  top: 78%; }
  25%  { right: 44%; top: 60%; transform: translateY(-32px) rotateY(20deg); }
  50%  { right: 76%; top: 80%; transform: rotateY(180deg); }
  100% { right: 8%;  top: 78%; }
}
@keyframes bik-fox {
  0%   { right: 10%; bottom: 8%;  }
  40%  { right: 52%; bottom: 30%; transform: rotateY(0deg); }
  80%  { right: 80%; bottom: 12%; transform: rotateY(180deg); }
  100% { right: 10%; bottom: 8%;  }
}

/* ── Footer ──────────────────────────────────────────────────── */
.bik-footer {
  border-top: 1px solid var(--bik-border);
  padding: 22px 28px;
  font-size: 0.8rem; color: var(--bik-muted);
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.bik-footer a { color: var(--bik-violet2); text-decoration: none; }

/* ── Scrollbar (webkit) ──────────────────────────────────────── */
.bik-wrap::-webkit-scrollbar { width: 6px; }
.bik-wrap::-webkit-scrollbar-track { background: rgba(255,255,255,0.03); }
.bik-wrap::-webkit-scrollbar-thumb { background: rgba(109,76,255,0.4); border-radius: 99px; }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 1000px) {
  .bik-layout { grid-template-columns: 1fr; }
  .bik-sidebar { display: none; }
  .bik-mascots .bik-m-fox, .bik-mascots .bik-m-owl { display: none; }
}
@media (max-width: 700px) {
  .bik-main { padding: 18px 14px 50px; }
  .bik-hero { padding: 22px 18px 20px; }
  .bik-mascots { display: none; }
  .bik-subjects { grid-template-columns: repeat(auto-fill, minmax(90px,1fr)); }
}