:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-2: #eef3f9;
  --text: #102033;
  --muted: #64748b;
  --line: #dbe4ef;
  --accent: #1565c0;
  --accent-2: #0d47a1;
  --danger: #b42318;
  --shadow: 0 12px 35px rgba(15, 31, 50, .08);
  --radius: 22px;
}

html[data-theme="dark"] {
  --bg: #07111e;
  --surface: #0d1726;
  --surface-2: #152235;
  --text: #ecf3fb;
  --muted: #9fb0c4;
  --line: #22344a;
  --accent: #5da8ff;
  --accent-2: #2f83e7;
  --danger: #ff766d;
  --shadow: 0 12px 35px rgba(0, 0, 0, .28);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", Inter, system-ui, sans-serif; }
body { padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); }
button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

.topbar { max-width: 980px; margin: 0 auto; padding: 20px 20px 10px; display: flex; justify-content: space-between; align-items: center; }
.brand { font-size: 22px; font-weight: 800; letter-spacing: -.4px; }
.subtitle { font-size: 12px; color: var(--muted); margin-top: 2px; }
.shell { max-width: 980px; margin: 0 auto; padding: 10px 18px 80px; }
.view { display: none; }
.view.active { display: block; }

.hero-card, .panel, .study-shell { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-card { padding: 24px; display: grid; gap: 20px; }
.hero-card h1 { margin: 4px 0 8px; font-size: clamp(30px, 6vw, 46px); line-height: 1.02; letter-spacing: -1.4px; }
.hero-card p { color: var(--muted); line-height: 1.55; margin: 0; max-width: 650px; }
.eyebrow { font-size: 11px; font-weight: 800; letter-spacing: 1.6px; color: var(--accent); }

button { border: 0; border-radius: 14px; cursor: pointer; font-weight: 700; }
.primary { background: var(--accent); color: white; padding: 14px 18px; }
.primary:active { background: var(--accent-2); transform: translateY(1px); }
.secondary { background: var(--surface-2); color: var(--text); padding: 11px 14px; border: 1px solid var(--line); }
.icon-btn { width: 42px; height: 42px; background: var(--surface); color: var(--text); border: 1px solid var(--line); }
.full { width: 100%; }
.danger { background: transparent; color: var(--danger); border: 1px solid color-mix(in srgb, var(--danger) 40%, transparent); padding: 12px 14px; }

.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 14px 0 28px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 16px 12px; text-align: center; }
.stat span { display: block; font-size: 25px; font-weight: 850; }
.stat small { color: var(--muted); font-size: 11px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 12px; margin: 22px 2px 12px; }
.section-head.compact { margin-top: 0; }
h2 { margin: 4px 0 2px; font-size: 24px; }
.section-head p, .panel > p { color: var(--muted); margin: 3px 0 0; font-size: 13px; }

.deck-list { display: grid; gap: 10px; }
.deck-card { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 14px; padding: 17px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; }
.deck-card h3 { margin: 0 0 5px; font-size: 17px; }
.deck-card p { margin: 0; color: var(--muted); font-size: 12px; }
.deck-card .counts { display: flex; gap: 8px; margin-top: 9px; flex-wrap: wrap; }
.mini-pill, .pill { display: inline-flex; align-items: center; background: var(--surface-2); color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 5px 8px; font-size: 10px; font-weight: 700; }
.deck-open { min-width: 82px; }
.empty-state { text-align: center; padding: 45px 24px; border: 1px dashed var(--line); border-radius: 20px; color: var(--muted); }
.empty-state h3 { color: var(--text); margin: 8px 0; }
.empty-state p { max-width: 430px; margin: 0 auto 18px; line-height: 1.5; }
.empty-icon { font-size: 36px; }

.back-link { margin: 4px 0 14px; background: transparent; color: var(--accent); padding: 8px 2px; }
.panel { padding: 22px; }
.progress-wrap { margin-top: 22px; }
.progress, .study-progress { height: 7px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.progress > div, .study-progress > div { width: 0%; height: 100%; background: var(--accent); transition: width .3s ease; }
.progress-wrap p { color: var(--muted); font-size: 12px; }
.hidden { display: none !important; }

.import-summary-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 18px 0; }
.import-metric { background: var(--surface-2); border: 1px solid var(--line); border-radius: 15px; padding: 14px; }
.import-metric strong { display: block; font-size: 21px; }
.import-metric span { color: var(--muted); font-size: 11px; }
.check-list { display: grid; gap: 8px; margin: 16px 0; }
.check-row { display: flex; gap: 8px; align-items: flex-start; font-size: 13px; color: var(--muted); }
.check-row.ok::before { content: "✓"; color: #159455; font-weight: 900; }
.check-row.warn::before { content: "!"; color: #b47700; font-weight: 900; }
.import-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 18px; }

.study-shell { padding: 16px; max-width: 760px; margin: 0 auto; }
.study-topline { display: flex; justify-content: space-between; color: var(--muted); font-size: 12px; margin-bottom: 10px; gap: 12px; }
.card-frame { width: 100%; min-height: 430px; height: 60vh; border: 0; background: white; border-radius: 18px; margin: 12px 0; }
.ratings { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; }
.ratings button { background: var(--surface-2); color: var(--text); border: 1px solid var(--line); padding: 11px 5px; }
.ratings span { display: block; font-size: 12px; }
.ratings small { display: block; color: var(--muted); margin-top: 4px; font-size: 8px; }
.study-actions { display: flex; gap: 8px; margin-top: 11px; }
.study-actions button { flex: 1; }
.preview-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }

.deck-actions-large { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 22px 0 10px; }
.deck-stats { margin-bottom: 18px; }
.danger-zone { border-top: 1px solid var(--line); padding-top: 18px; margin-top: 18px; }
.danger-zone h3 { margin: 0 0 10px; font-size: 14px; }

.toast { position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom)); transform: translateX(-50%) translateY(20px); background: #111827; color: white; border-radius: 12px; padding: 11px 14px; font-size: 12px; opacity: 0; pointer-events: none; transition: .2s; z-index: 100; max-width: calc(100vw - 36px); text-align: center; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.7); display: grid; place-items: center; z-index: 200; padding: 14px; }
.modal-card { width: min(940px, 100%); height: min(90vh, 900px); background: var(--surface); border-radius: 20px; position: relative; padding: 12px; }
.modal-close { position: absolute; right: 18px; top: 18px; z-index: 3; width: 38px; height: 38px; background: rgba(0,0,0,.72); color: white; font-size: 24px; }
.modal-card iframe { width: 100%; height: 100%; border: 0; border-radius: 14px; background: white; }

@media (max-width: 620px) {
  .shell { padding-left: 12px; padding-right: 12px; }
  .topbar { padding-left: 16px; padding-right: 16px; }
  .hero-card { padding: 20px; }
  .stats-grid { gap: 7px; }
  .stat { padding: 13px 6px; }
  .stat span { font-size: 21px; }
  .deck-card { grid-template-columns: 1fr; }
  .deck-open { width: 100%; }
  .ratings { grid-template-columns: repeat(2, 1fr); }
  .card-frame { height: 58vh; min-height: 390px; }
  .import-actions, .deck-actions-large { grid-template-columns: 1fr; }
}

.scheduler-note{margin:10px 0 8px;text-align:center;font-size:12px;color:var(--muted);font-weight:700;letter-spacing:.02em;}

/* v2.4 — estudo diário, configurações, backup e zoom */
.top-actions{display:flex;gap:8px;align-items:center}
.hero-actions{display:grid;grid-template-columns:1.4fr 1fr;gap:10px}
button:disabled{opacity:.5;cursor:default;transform:none!important}
.today-grid{grid-template-columns:repeat(4,1fr);margin-bottom:10px}
.today-summary{display:flex;justify-content:space-between;gap:10px;align-items:center;margin:0 0 26px;padding:12px 15px;border:1px solid var(--line);border-radius:16px;background:var(--surface-2);color:var(--muted);font-size:12px}
.today-summary strong{color:var(--text);font-size:14px}
.study-actions-three{display:grid;grid-template-columns:repeat(3,1fr)}
.image-hint{margin:9px 2px 0;text-align:center;color:var(--muted);font-size:10px;line-height:1.4}
.settings-panel{max-width:760px;margin:0 auto}
.settings-section{border-top:1px solid var(--line);margin-top:22px;padding-top:18px}
.settings-section h3{font-size:16px;margin:0 0 12px}
.setting-row{display:grid;grid-template-columns:1fr minmax(90px,130px);gap:14px;align-items:center;padding:13px 0;border-bottom:1px solid var(--line)}
.setting-row span{display:grid;gap:4px}.setting-row small,.settings-copy{color:var(--muted);font-size:11px;line-height:1.45}
.setting-row select,.setting-row input{width:100%;border:1px solid var(--line);background:var(--surface-2);color:var(--text);border-radius:12px;padding:10px 11px;font-weight:700}
.fixed-steps{display:grid;gap:5px;background:var(--surface-2);border:1px solid var(--line);border-radius:15px;padding:13px;margin:14px 0}
.fixed-steps span{color:var(--muted);font-size:11px}
.backup-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin:12px 0}
.storage-status{font-size:10px;color:var(--muted);padding:10px 0}
.image-viewer{height:100%;display:grid;grid-template-rows:auto 1fr auto;gap:8px}
.image-toolbar{display:flex;justify-content:center;align-items:center;gap:8px;padding-right:48px;min-height:44px}
.image-toolbar button{padding:8px 13px;min-width:44px}.image-toolbar span{min-width:52px;text-align:center;font-size:12px;font-weight:800;color:var(--muted)}
.image-stage{position:relative;overflow:hidden;border-radius:14px;background:#05070a;display:flex;align-items:center;justify-content:center;touch-action:none;min-height:0}
.image-stage img{max-width:96%;max-height:96%;object-fit:contain;transform-origin:center center;will-change:transform;user-select:none;-webkit-user-drag:none}
.zoom-help{text-align:center;color:var(--muted);font-size:10px;padding:3px 8px 2px}

@media (max-width:620px){
  .hero-actions{grid-template-columns:1fr}
  .today-grid{grid-template-columns:repeat(2,1fr)}
  .today-summary{align-items:flex-start;flex-direction:column}
  .study-actions-three{grid-template-columns:1fr 1fr}.study-actions-three #zoomBtn{grid-column:1/-1}
  .setting-row{grid-template-columns:1fr 105px}
  .backup-actions{grid-template-columns:1fr}
  .modal-card{height:94vh;padding:8px}
}