:root {
  color-scheme: dark;
  --bg: #081005;
  --panel: #0f1a0b;
  --panel-2: #152411;
  --line: #233a1c;
  --text: #f4f7f1;
  --muted: #a9b7a2;
  --accent: #ea580c;
  --accent-2: #00a10d;
  --danger: #ff5c5c;
  --ok: #00a10d;
  --on-accent: #081005;
  --accent-rgb: 234, 88, 12;
  --accent-2-rgb: 0, 161, 13;
  --bg-rgb: 8, 16, 5;
  --danger-rgb: 255, 92, 92;
}
html[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f7f0;
  --panel: #ffffff;
  --panel-2: #eef1e4;
  --line: #d7ddc9;
  --text: #142011;
  --muted: #5f6b58;
  --ok: #00a10d;
  --on-accent: #081005;
  --accent-rgb: 234, 88, 12;
  --accent-2-rgb: 0, 161, 13;
  --bg-rgb: 246, 247, 240;
  --danger-rgb: 255, 92, 92;
}
body.dyslexia {
  font-family: "Comic Sans MS", "Trebuchet MS", system-ui, sans-serif;
  letter-spacing: .035em;
  word-spacing: .12em;
  line-height: 1.7;
}
html[data-theme="light"] .header { background: rgba(var(--bg-rgb), .94); }
html[data-theme="light"] .bottom-nav { background: rgba(var(--bg-rgb), .97); }
html[data-theme="light"] .nav-item.active { background: var(--panel-2); }
html[data-theme="light"] .chip.active { color: var(--accent); }
html[data-theme="light"] .badge,
html[data-theme="light"] .tool { color: var(--accent); }
html[data-theme="light"] .canvas-overlay { background: var(--bg); }
html[data-theme="light"] .source-check,
html[data-theme="light"] .info-box > span { color: var(--accent); }
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; overflow-x: hidden; max-width: 100%; }
body {
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overscroll-behavior: none;
}
button, input, textarea, select { font: inherit; font-size: 16px; color: inherit; }
button { cursor: pointer; border: 0; background: none; }
.app { height: 100dvh; min-height: 0; display: flex; flex-direction: column; max-width: 560px; margin: 0 auto; }
.screen { flex: 1; display: flex; flex-direction: column; min-height: 100dvh; overflow-y: auto; }
.screen.main-screen { height: 100%; min-height: 0; overflow: hidden; }
.pad { padding: 22px 18px; }
.splash { background: #ffffff; }
.splash p { color: #5f6b58; }
.center { display: flex; flex-direction: column; justify-content: center; min-height: 100dvh; }
h1 { font-size: 26px; line-height: 1.2; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 18px; margin: 0 0 8px; }
p { color: var(--muted); line-height: 1.55; margin: 0 0 16px; }
.small { font-size: 13px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 16px; }
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.field label { font-size: 13px; color: var(--muted); }
.input, textarea.input {
  width: 100%; background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 14px; padding: 14px; color: var(--text); outline: none;
}
.input:focus { border-color: var(--accent); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 18px; border-radius: 14px; background: var(--accent); color: var(--on-accent);
  font-weight: 600; width: 100%;
}
.btn:disabled { opacity: .45; }
.btn.secondary { background: var(--panel-2); border: 1px solid var(--line); color: var(--text); }
.btn.ghost { background: transparent; color: var(--muted); width: auto; padding: 10px; }
.btn.danger { background: rgba(var(--danger-rgb), .12); color: var(--danger); }
.row { display: flex; gap: 10px; align-items: center; }
.grow { flex: 1; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 10px 14px; border-radius: 999px; background: var(--panel-2);
  border: 1px solid var(--line); color: var(--muted); font-size: 14px;
}
.chip.active { background: rgba(var(--accent-rgb), .18); border-color: var(--accent); color: var(--accent); }
.steps { display: flex; gap: 6px; margin-bottom: 22px; }
.steps span { height: 4px; border-radius: 99px; background: var(--line); flex: 1; }
.steps span.on { background: var(--accent); }
.header { position: sticky; top: 0; z-index: 5; background: rgba(var(--bg-rgb),.92); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.header .inner { display: flex; align-items: center; gap: 10px; padding: 14px 16px; }
.logo { font-weight: 800; letter-spacing: -0.03em; font-size: 18px; color: var(--accent-2); }
.logo span { color: var(--accent); }
.badge { font-size: 11px; padding: 4px 8px; border-radius: 99px; background: rgba(var(--accent-rgb),.16); color: var(--accent); }
.bottom-nav { position: sticky; bottom: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; padding: 8px 10px calc(8px + env(safe-area-inset-bottom)); background: rgba(var(--bg-rgb),.96); border-top: 1px solid var(--line); backdrop-filter: blur(14px); }
.nav-item { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 8px; color: var(--muted); font-size: 11px; border-radius: 12px; }
.nav-item.active { color: var(--text); background: var(--panel); }
.nav-item .ico { font-size: 18px; }
.main { flex: 1; min-height: 0; overflow: hidden; display: flex; flex-direction: column; }
.main > .pad { flex: 1; min-height: 0; overflow-y: auto; -webkit-overflow-scrolling: touch; }
.chat-wrap { flex: 1; overflow-y: auto; padding: 18px 16px 8px; }
.msg { display: flex; margin-bottom: 14px; }
.msg.user { justify-content: flex-end; }
.bubble { max-width: 86%; min-width: 0; overflow: hidden; padding: 12px 14px; border-radius: 16px; line-height: 1.55; white-space: normal; word-break: break-word; }
.bubble .content { white-space: pre-wrap; }
.math-block { width: 100%; max-width: 100%; margin: 8px 0; overflow-x: auto; overflow-y: hidden; scrollbar-width: none; }
.katex-display { max-width: 100%; overflow-x: auto; overflow-y: hidden; margin: 6px 0; scrollbar-width: none; }
.math-block::-webkit-scrollbar, .katex-display::-webkit-scrollbar { display: none; }
.katex { font-size: 1.03em; }
.msg.assistant .bubble { background: var(--panel); border: 1px solid var(--line); border-bottom-left-radius: 6px; }
.msg.user .bubble { background: var(--accent); color: var(--on-accent); border-bottom-right-radius: 6px; }
.bubble img { display: block; max-width: 100%; border-radius: 10px; margin-bottom: 8px; }
.typing { color: var(--muted); font-size: 12px; }
.composer { display: flex; gap: 8px; padding: 10px 12px calc(10px + env(safe-area-inset-bottom)); background: var(--bg); border-top: 1px solid var(--line); }
.composer .input { flex: 1; padding: 12px 14px; border-radius: 999px; }
.icon-btn { width: 44px; height: 44px; border-radius: 50%; background: var(--panel-2); border: 1px solid var(--line); display: grid; place-items: center; font-size: 18px; }
.icon-btn.send { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.subject-bar { display: flex; gap: 6px; overflow-x: auto; padding: 8px 12px; border-bottom: 1px solid var(--line); scrollbar-width: none; }
.subject-bar .chip { flex: 0 0 auto; padding: 8px 12px; font-size: 13px; }
.suggestions { display: flex; gap: 8px; overflow-x: auto; padding: 10px 12px; border-top: 1px solid var(--line); }
.suggestions button { flex: 0 0 auto; padding: 9px 12px; border-radius: 12px; background: var(--panel); border: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.list { display: flex; flex-direction: column; gap: 10px; }
.item { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 14px; }
.item h3 { margin: 0 0 4px; font-size: 15px; }
.item p { margin: 0; font-size: 13px; }
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 14px; }
.stat b { display: block; font-size: 24px; margin-bottom: 4px; }
.stat span { color: var(--muted); font-size: 12px; }
.tabs { display: flex; gap: 8px; overflow-x: auto; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.avatar { width: 42px; height: 42px; border-radius: 50%; background: var(--accent); color: var(--on-accent); display: grid; place-items: center; font-weight: 700; }
.toast { position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%); background: var(--panel-2); border: 1px solid var(--line); color: var(--text); padding: 10px 16px; border-radius: 12px; z-index: 50; font-size: 13px; max-width: 90%; }
.modal-back { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: grid; place-items: end center; z-index: 40; }
.modal { width: 100%; max-width: 560px; background: var(--panel); border-radius: 22px 22px 0 0; padding: 20px 18px calc(20px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line); }
.muted { color: var(--muted); }
.center-text { text-align: center; }
.voice-card { display: flex; align-items: center; gap: 12px; padding: 14px; border-radius: 14px; border: 1px solid var(--line); background: var(--panel); margin-bottom: 10px; }
.voice-card.active { border-color: var(--accent); background: rgba(var(--accent-rgb),.12); }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--ok); }
.hidden { display: none !important; }
.live { font-size: 10px; color: var(--muted); margin-left: 2px; letter-spacing: .02em; }
.live.on { color: var(--ok); }
.tools { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 6px; }
.tool { font-size: 11px; padding: 4px 8px; border-radius: 999px; background: rgba(var(--accent-rgb),.14); color: var(--accent); border: 1px solid rgba(var(--accent-rgb),.35); }
.canvas-overlay { position: fixed; inset: 0; z-index: 60; background: var(--bg); display: flex; flex-direction: column; }
.canvas-bar { display: flex; gap: 8px; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.canvas-bar .btn { width: auto; padding: 8px 12px; }
.canvas-overlay canvas { touch-action: none; flex: 1; background: var(--bg); }

.invisible { visibility: hidden; }
.section-label { font-size: 12px; letter-spacing: .08em; color: var(--muted); text-transform: uppercase; margin: 22px 0 10px; }
.exam-title-row { margin-bottom: 14px; }
.exam-title-row h1 { margin: 0; }
.hero-card {
  background: radial-gradient(120% 100% at 50% 0%, rgba(var(--accent-rgb),.30), var(--panel) 62%);
  border: 1px solid var(--line); border-radius: 22px; padding: 24px 18px; text-align: center;
}
.hero-icon { width: 58px; height: 58px; border-radius: 50%; margin: 0 auto 14px; display: grid; place-items: center; font-size: 26px; background: rgba(var(--accent-rgb),.18); border: 1px solid rgba(var(--accent-rgb),.35); color: var(--accent); }
.hero-card h2 { font-size: 24px; line-height: 1.15; margin-bottom: 10px; }
.hero-card p { margin-bottom: 18px; }
.exam-how { margin-top: 6px; color: var(--muted); }
.start-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.start-card { text-align: left; background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 16px; color: var(--text); }
.start-card b { display: block; margin-top: 12px; font-size: 15px; }
.start-card small { display: block; margin-top: 6px; color: var(--muted); font-size: 10px; letter-spacing: .05em; line-height: 1.45; }
.start-icon { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: var(--panel-2); border: 1px solid var(--line); font-size: 20px; }

.wizard-backdrop { position: fixed; inset: 0; z-index: 45; display: flex; align-items: flex-end; justify-content: center; }
.wizard-hit { position: absolute; inset: 0; background: rgba(0,0,0,.62); }
.wizard-sheet { position: relative; z-index: 1; }
.wizard-sheet-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.wizard-sheet-head b { font-size: 16px; }
.source-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 18px; }
.source-option { display: flex; align-items: center; gap: 14px; width: 100%; padding: 16px; border-radius: 16px; border: 1px solid var(--line); background: var(--panel-2); color: var(--text); }
.source-option.active { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.source-icon { width: 34px; text-align: center; font-size: 20px; }
.source-option b { display: block; font-size: 15px; }
.source-option small { display: block; margin-top: 4px; color: var(--muted); font-size: 10px; letter-spacing: .05em; line-height: 1.4; }
.source-check { color: var(--accent); font-weight: 700; }
.wizard-overlay { position: fixed; inset: 0; z-index: 45; background: var(--bg); overflow-y: auto; padding: 14px 18px calc(110px + env(safe-area-inset-bottom)); }
.wizard-bar { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.wizard-progress { flex: 1; height: 4px; border-radius: 99px; background: var(--line); overflow: hidden; }
.wizard-progress span { display: block; height: 100%; background: var(--text); border-radius: 99px; }
.wizard-title { font-size: 30px; margin: 18px 0 22px; }
.wizard-cta { position: fixed; left: 18px; right: 18px; bottom: calc(18px + env(safe-area-inset-bottom)); width: auto; z-index: 2; }
.subject-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 20px; }
.subject-tile { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 16px; min-height: 74px; border-radius: 16px; border: 1px solid var(--line); background: var(--panel); color: var(--text); text-align: left; }
.subject-tile.active { border-color: var(--accent); background: rgba(var(--accent-rgb),.12); }
.subject-tile span { font-size: 24px; }
.subject-tile b { font-size: 15px; font-weight: 600; }
.date-list { display: flex; flex-direction: column; gap: 10px; margin-top: 10px; }
.date-option { display: flex; align-items: center; gap: 12px; width: 100%; padding: 16px; border-radius: 16px; border: 1px solid var(--line); background: var(--panel); color: var(--text); text-align: left; }
.date-option.active { border-color: var(--accent); }
.date-option small { display: block; color: var(--muted); margin-top: 4px; font-size: 12px; }
.date-chip { display: grid; place-items: center; width: 56px; padding: 8px 0; border-radius: 12px; background: var(--panel-2); border: 1px solid var(--line); }
.date-chip b { font-size: 20px; }
.date-chip small { font-size: 9px; letter-spacing: .08em; }
.or-sep { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 11px; letter-spacing: .1em; margin: 22px 0; }
.or-sep::before, .or-sep::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.upload-hero { text-align: center; border: 1px solid var(--line); border-radius: 22px; background: var(--panel); padding: 24px 18px; margin: 16px 0 22px; }
.upload-phone { font-size: 56px; margin-bottom: 8px; }
.upload-hero p { margin: 6px 0 16px; }
.attach-preview { display: flex; align-items: center; gap: 12px; margin-top: 14px; }
.attach-preview small { display: block; color: var(--muted); margin-top: 3px; }
.info-box { display: flex; gap: 12px; padding: 16px; border-radius: 16px; border: 1px solid var(--line); background: var(--panel); margin: 18px 0; }
.info-box > span { color: var(--accent); font-size: 18px; }
.info-box p { margin: 0; font-size: 13px; }
.info-box b { color: var(--text); }

.profile-head { text-align: center; padding: 18px 0 22px; }
.profile-avatar { width: 96px; height: 96px; border-radius: 50%; margin: 0 auto 14px; display: grid; place-items: center; font-size: 36px; font-weight: 700; background: var(--accent); color: var(--on-accent); border: 2px solid rgba(var(--accent-rgb),.35); }
.profile-head h1 { margin-bottom: 4px; }
.profile-head p { margin-bottom: 16px; }
.profile-settings { width: auto; padding: 10px 18px; border-radius: 999px; }
.plan-card { margin-bottom: 12px; }
.plan-cta { width: auto; padding: 10px 16px; border-radius: 999px; background: var(--accent); color: var(--on-accent); }
.invite-card { display: flex; align-items: center; gap: 14px; width: 100%; color: var(--text); text-align: left; margin-bottom: 12px; }
.invite-card .coin { font-size: 32px; }
.invite-card b { display: block; font-size: 15px; }
.invite-card p { margin: 4px 0 0; font-size: 13px; }
.chev { color: var(--muted); font-size: 24px; }
.streak-card .flame { font-size: 30px; opacity: .5; }
.streak-card b { display: block; font-size: 15px; }
.streak-card p { margin: 4px 0 16px; font-size: 13px; }
.streak-week { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; text-align: center; }
.streak-day { display: flex; flex-direction: column; align-items: center; gap: 8px; font-size: 10px; color: var(--muted); }
.streak-day i { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; background: var(--panel-2); border: 1px solid var(--line); font-size: 14px; opacity: .35; font-style: normal; }
.streak-day.today i { border-color: var(--text); opacity: .9; }
.streak-day.today span { color: var(--text); font-weight: 700; }