/* ─────────────────────────────────────────────
   FONTS
───────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@400;500;600&display=swap');

/* ─────────────────────────────────────────────
   TOKENS — DARK (DEFAULT)
───────────────────────────────────────────── */
:root {
  color-scheme: dark;
  --font-body:      "Manrope", sans-serif;
  --font-heading:   "Plus Jakarta Sans", "Manrope", sans-serif;

  /* surface */
  --bg:             #06060a;
  --paper:          rgba(10, 10, 18, 0.82);
  --paper-strong:   rgba(14, 14, 24, 0.96);
  --glass:          rgba(255, 255, 255, 0.035);
  --glass-strong:   rgba(255, 255, 255, 0.055);

  /* text */
  --ink:            #f0ecf8;
  --muted:          #7a748e;
  --subtle:         #3e3a52;

  /* borders */
  --line:           rgba(255, 255, 255, 0.085);
  --line-strong:    rgba(255, 255, 255, 0.15);

  /* brand accent — electric violet */
  --accent:         #a78bfa;
  --accent-mid:     #7c5cf0;
  --accent-deep:    #4c2eab;
  --accent-glow:    rgba(124, 92, 240, 0.35);
  --accent-soft:    rgba(167, 139, 250, 0.12);

  /* semantic */
  --success:        #6ee7b7;
  --success-soft:   rgba(110, 231, 183, 0.14);
  --warm:           #fb923c;
  --warm-soft:      rgba(251, 146, 60, 0.14);

  /* shadows */
  --shadow:         0 32px 96px rgba(0, 0, 0, 0.56), 0 4px 16px rgba(0, 0, 0, 0.32);
  --shadow-soft:    0 16px 48px rgba(0, 0, 0, 0.36), 0 2px 8px rgba(0, 0, 0, 0.22);
  --shadow-glow:    0 0 0 1px var(--accent-soft), 0 24px 64px rgba(124, 92, 240, 0.22);
  --shadow-card:    0 1px 0 rgba(255,255,255,0.05) inset, 0 -1px 0 rgba(0,0,0,0.4) inset;

  /* easing */
  --ease-spring:    cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth:    cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out:       cubic-bezier(0, 0, 0.2, 1);
}

/* ─────────────────────────────────────────────
   RESET & BASE
───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 60% at 10% 0%,   rgba(76, 46, 171, 0.28)  0%, transparent 55%),
    radial-gradient(ellipse 60% 50% at 92% 8%,    rgba(124, 92, 240, 0.18) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 50% 100%,  rgba(76, 46, 171, 0.14) 0%, transparent 55%),
    linear-gradient(180deg, #070710 0%, #08080f 50%, #06060a 100%);
  -webkit-font-smoothing: antialiased;
}

/* noise grain overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.036;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* ambient light orb — bottom right */
body::after {
  content: "";
  position: fixed;
  inset: auto -10vw -12vh auto;
  width: 52vw;
  height: 52vw;
  max-width: 700px;
  max-height: 700px;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle at 60% 40%, rgba(124, 92, 240, 0.12), transparent 68%);
  filter: blur(40px);
}

/* ─────────────────────────────────────────────
   FORM ELEMENTS
───────────────────────────────────────────── */
button, input, select { font: inherit; }

input, select {
  width: 100%;
  padding: 13px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(12, 12, 22, 0.94);
  color: var(--ink);
  box-shadow: var(--shadow-card);
  outline: none;
  transition:
    border-color 180ms var(--ease-smooth),
    box-shadow   180ms var(--ease-smooth);
}

input:focus, select:focus {
  border-color: var(--accent-mid);
  box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow-card);
}

/* ─────────────────────────────────────────────
   BUTTON BASE
───────────────────────────────────────────── */
button {
  cursor: pointer;
  transition:
    transform    180ms var(--ease-spring),
    box-shadow   180ms var(--ease-smooth),
    opacity      160ms var(--ease-smooth),
    background   160ms var(--ease-smooth),
    border-color 160ms var(--ease-smooth);
}

button:hover:not(:disabled) { transform: translateY(-2px); }
button:active:not(:disabled) { transform: translateY(0); transition-duration: 80ms; }
button:disabled { cursor: not-allowed; opacity: 0.45; }

/* ─────────────────────────────────────────────
   PAGE SHELL
───────────────────────────────────────────── */
.page-shell {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: 36px 28px 56px;
}

/* ─────────────────────────────────────────────
   AUTH OVERLAY
───────────────────────────────────────────── */
.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(4, 4, 10, 0.72);
  backdrop-filter: blur(24px) saturate(140%);
}

.auth-overlay.hidden { display: none; }

.auth-card {
  width: min(100%, 460px);
  padding: 36px;
  border-radius: 32px;
  background: linear-gradient(160deg, rgba(14, 12, 28, 0.98), rgba(10, 10, 20, 0.96));
  border: 1px solid rgba(167, 139, 250, 0.14);
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.64), 0 0 0 1px rgba(167, 139, 250, 0.06) inset;
}

.auth-card h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1.12;
  font-weight: 400;
  letter-spacing: -0.03em;
}

.auth-text {
  margin: 14px 0 18px;
  color: var(--muted);
  line-height: 1.65;
}

.auth-form  { display: grid; gap: 6px; }
.auth-submit { margin-top: 16px; }

.auth-error {
  margin: 14px 0 0;
  padding: 12px 16px;
  border-radius: 16px;
  background: rgba(201, 95, 62, 0.1);
  border: 1px solid rgba(201, 95, 62, 0.2);
  color: var(--warm);
}

.auth-note {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 14px;
}

/* ─────────────────────────────────────────────
   LAYOUT — HERO & WORKSPACE
───────────────────────────────────────────── */
.hero {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.hero-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

/* ─────────────────────────────────────────────
   SHARED PANEL BASE
───────────────────────────────────────────── */
.hero-copy,
.hero-panel,
.control-panel,
.practice-stage {
  position: relative;
  z-index: 1;
  background: var(--paper);
  backdrop-filter: blur(24px) saturate(120%);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

/* ─────────────────────────────────────────────
   HERO COPY
───────────────────────────────────────────── */
.hero-copy {
  padding: 38px 40px;
  overflow: hidden;
  background: linear-gradient(150deg, rgba(12, 10, 26, 0.98), rgba(10, 10, 18, 0.92));
  border-color: rgba(167, 139, 250, 0.12);
}

/* top-left accent orb */
.hero-copy::before {
  content: "";
  position: absolute;
  inset: -8% auto auto -4%;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(124, 92, 240, 0.2), transparent 68%);
  pointer-events: none;
  filter: blur(10px);
}

/* bottom-right accent orb */
.hero-copy::after {
  content: "";
  position: absolute;
  inset: auto -8% -22% auto;
  width: 300px;
  height: 300px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(167, 139, 250, 0.12), transparent 66%);
  pointer-events: none;
  filter: blur(16px);
}

/* ─────────────────────────────────────────────
   EYEBROW & BADGE
───────────────────────────────────────────── */
.eyebrow, .current-badge {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 11px;
  color: var(--muted);
  font-weight: 700;
}

/* ─────────────────────────────────────────────
   THEME TOGGLE
───────────────────────────────────────────── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(18, 16, 34, 0.96), rgba(10, 10, 20, 0.94));
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.32), 0 1px 0 rgba(255,255,255,0.05) inset;
}

.theme-toggle:hover:not(:disabled) {
  border-color: rgba(167, 139, 250, 0.3);
  box-shadow: 0 0 0 1px var(--accent-soft), 0 10px 28px rgba(0, 0, 0, 0.36);
}

/* ─────────────────────────────────────────────
   HERO TYPOGRAPHY
───────────────────────────────────────────── */
.hero h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(34px, 3.6vw, 48px);
  line-height: 1.06;
  letter-spacing: -0.035em;
  max-width: 13ch;
  font-weight: 400;
  /* gradient text */
  background: linear-gradient(135deg, #f0ecf8 30%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text {
  max-width: 54ch;
  margin: 18px 0 0;
  font-size: 17px;
  line-height: 1.86;
  color: var(--muted);
}

/* ─────────────────────────────────────────────
   HERO PANEL (STATS)
───────────────────────────────────────────── */
.hero-panel {
  display: grid;
  gap: 12px;
  padding: 16px;
  background: linear-gradient(180deg, rgba(8, 8, 18, 0.94), rgba(12, 12, 20, 0.98));
}

.hero-panel-wide { grid-template-columns: repeat(5, 1fr); }

/* ─────────────────────────────────────────────
   STAT CARD
───────────────────────────────────────────── */
.stat-card, .panel-block, .question-card {
  border-radius: 22px;
  background: var(--paper-strong);
  border: 1px solid var(--line);
}

.stat-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 148px;
  padding: 22px 20px;
  box-shadow: var(--shadow-card);
  background: linear-gradient(160deg, rgba(16, 14, 30, 0.98), rgba(10, 10, 20, 0.94));
  transition: border-color 220ms var(--ease-smooth), box-shadow 220ms var(--ease-smooth);
  cursor: default;
}

.stat-card:hover {
  border-color: rgba(167, 139, 250, 0.2);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(167, 139, 250, 0.08) inset;
}

.stat-card strong {
  font-size: clamp(28px, 2.8vw, 38px);
  line-height: 1;
  letter-spacing: -0.04em;
  font-family: var(--font-heading);
  font-weight: 500;
  background: linear-gradient(135deg, var(--ink) 40%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ─────────────────────────────────────────────
   WORKSPACE
───────────────────────────────────────────── */
.workspace {
  display: grid;
  grid-template-columns: minmax(320px, 380px) minmax(0, 1fr);
  gap: 20px;
}

/* ─────────────────────────────────────────────
   CONTROL PANEL
───────────────────────────────────────────── */
.control-panel {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: linear-gradient(180deg, rgba(8, 8, 16, 0.94), rgba(10, 10, 18, 0.98));
}

.panel-block {
  padding: 22px;
  box-shadow: var(--shadow-soft);
  background: linear-gradient(180deg, rgba(14, 12, 26, 0.98), rgba(8, 8, 18, 0.96));
  border-color: rgba(167, 139, 250, 0.08);
}

.panel-block h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 16px;
  letter-spacing: -0.025em;
  font-weight: 500;
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

/* ─────────────────────────────────────────────
   LABELS & FIELD GROUPS
───────────────────────────────────────────── */
.field-label {
  display: block;
  margin: 14px 0 8px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.inline-field {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

/* ─────────────────────────────────────────────
   BUTTONS
───────────────────────────────────────────── */
.ghost-button {
  width: 100%;
  margin-top: 10px;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(16, 14, 28, 0.96), rgba(10, 10, 20, 0.92));
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset;
}

.ghost-button:hover:not(:disabled) {
  border-color: var(--line-strong);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06) inset, 0 4px 16px rgba(0,0,0,0.3);
}

.ghost-button.danger {
  color: var(--warm);
  border-color: rgba(251, 146, 60, 0.2);
}

.ghost-button.danger:hover:not(:disabled) {
  background: rgba(251, 146, 60, 0.08);
  border-color: rgba(251, 146, 60, 0.3);
}

.primary-button {
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid rgba(167, 139, 250, 0.5);
  background: linear-gradient(135deg, #a78bfa, #7c5cf0 60%, #5b3fcc);
  color: #fff;
  font-weight: 700;
  letter-spacing: -0.01em;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.12) inset,
    0 16px 40px rgba(124, 92, 240, 0.38),
    0 4px 12px rgba(0, 0, 0, 0.3);
}

.primary-button:hover:not(:disabled) {
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.16) inset,
    0 20px 52px rgba(124, 92, 240, 0.5),
    0 6px 16px rgba(0, 0, 0, 0.36);
}

/* ─────────────────────────────────────────────
   KBD & SHORTCUT
───────────────────────────────────────────── */
.shortcut-note {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  padding: 2px 7px;
  margin: 0 2px;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background: rgba(20, 18, 34, 0.96);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  box-shadow: 0 1px 0 rgba(255,255,255,0.05) inset, 0 2px 4px rgba(0,0,0,0.4);
}

/* ─────────────────────────────────────────────
   QUESTION LIST
───────────────────────────────────────────── */
.question-list {
  max-height: 320px;
  overflow: auto;
  display: grid;
  gap: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--subtle) transparent;
}

.question-list-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 12, 26, 0.96), rgba(8, 8, 18, 0.92));
  text-align: left;
  transition:
    border-color 160ms var(--ease-smooth),
    background   160ms var(--ease-smooth),
    box-shadow   160ms var(--ease-smooth);
}

.question-list-item:hover:not(.active) {
  border-color: var(--line-strong);
  background: rgba(167, 139, 250, 0.04);
}

.question-list-item.active {
  border-color: rgba(167, 139, 250, 0.28);
  background: linear-gradient(180deg, rgba(124, 92, 240, 0.1), rgba(76, 46, 171, 0.06));
  box-shadow: 0 0 0 1px rgba(167, 139, 250, 0.1) inset;
}

.question-list-item small { color: var(--muted); }

.question-list-status {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--subtle);
  transition: background 200ms, border-color 200ms, box-shadow 200ms;
}

.question-list-status.mastered {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 6px rgba(167, 139, 250, 0.6);
}

.question-list-status.review {
  background: var(--warm);
  border-color: var(--warm);
  box-shadow: 0 0 6px rgba(251, 146, 60, 0.5);
}

/* ─────────────────────────────────────────────
   ACCOUNT BLOCK
───────────────────────────────────────────── */
.account-name {
  margin: 0;
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.account-note {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

/* ─────────────────────────────────────────────
   CHIPS & PILLS
───────────────────────────────────────────── */
.sync-pill, .muted-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(167, 139, 250, 0.1);
  color: var(--muted);
  border: 1px solid var(--line);
}

.sync-pill.success {
  background: var(--success-soft);
  color: var(--success);
  border-color: rgba(110, 231, 183, 0.2);
}

.sync-pill.error {
  background: rgba(251, 146, 60, 0.12);
  color: var(--warm);
  border-color: rgba(251, 146, 60, 0.2);
}

/* ─────────────────────────────────────────────
   RECORD LIST
───────────────────────────────────────────── */
.record-list {
  display: grid;
  gap: 8px;
  max-height: 320px;
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--subtle) transparent;
}

.record-item, .empty-records {
  margin: 0;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(12, 10, 22, 0.94);
}

.empty-records { color: var(--muted); line-height: 1.6; }

.record-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.record-badge {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(167, 139, 250, 0.1);
  color: var(--muted);
}

.record-badge.correct {
  background: var(--success-soft);
  color: var(--success);
}

.record-badge.incorrect {
  background: var(--warm-soft);
  color: var(--warm);
}

.record-badge.revealed {
  background: var(--accent-soft);
  color: var(--accent);
}

.record-meta, .record-timestamp {
  font-size: 13px;
  color: var(--muted);
}

/* ─────────────────────────────────────────────
   PRACTICE STAGE
───────────────────────────────────────────── */
.practice-stage {
  padding: 28px;
  background: linear-gradient(160deg, rgba(8, 8, 18, 0.92), rgba(12, 10, 22, 0.98));
  border-color: rgba(167, 139, 250, 0.08);
}

.stage-topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: start;
}

.stage-topbar > div:first-child {
  max-width: 760px;
}

.stage-topbar h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(18px, 1.85vw, 26px);
  line-height: 1.2;
  letter-spacing: -0.028em;
  font-weight: 400;
  max-width: 24ch;
}

/* ─────────────────────────────────────────────
   PROGRESS
───────────────────────────────────────────── */
.progress-chip {
  padding: 9px 14px;
  border-radius: 999px;
  background: rgba(16, 14, 28, 0.9);
  border: 1px solid var(--line-strong);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.progress-rail {
  height: 6px;
  margin: 18px 0 30px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(167, 139, 250, 0.08);
  box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset;
}

.progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-mid), var(--accent));
  box-shadow: 0 0 12px rgba(167, 139, 250, 0.6);
  transition: width 280ms var(--ease-out);
}

/* ─────────────────────────────────────────────
   QUESTION CARD
───────────────────────────────────────────── */
.question-card {
  padding: clamp(24px, 3vw, 38px);
  box-shadow: var(--shadow-soft);
  background: linear-gradient(160deg, rgba(12, 10, 24, 0.98), rgba(14, 14, 22, 0.96));
  border-color: rgba(167, 139, 250, 0.1);
}

.question-content {
  display: grid;
  gap: 30px;
}

.question-content > * {
  width: min(100%, 760px);
  margin-inline: auto;
}

.question-content p {
  margin: 0;
  font-size: clamp(15px, 1.1vw, 16px);
  line-height: 1.95;
  letter-spacing: -0.012em;
}

.question-content .section-heading {
  margin-top: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.question-content .bullet {
  padding-left: 20px;
  text-indent: -20px;
}

.question-intro  {
  display: grid;
  gap: 18px;
  padding: 2px 0 0;
}

.part-stack      { display: grid; gap: 18px; }

/* ─────────────────────────────────────────────
   PART CARD
───────────────────────────────────────────── */
.part-card {
  padding: 24px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(16, 14, 28, 0.96), rgba(10, 10, 20, 0.98));
  box-shadow: var(--shadow-card);
}

.part-label {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  margin-bottom: 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
  border: 1px solid rgba(167, 139, 250, 0.2);
}

.part-prompt {
  display: grid;
  gap: 12px;
}

.part-hint {
  margin: 14px 0 12px;
  color: var(--muted);
  font-size: 14px;
}

/* ─────────────────────────────────────────────
   CHOICE BUTTONS
───────────────────────────────────────────── */
.choice-grid { display: grid; gap: 10px; }

.choice-button {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  width: 100%;
  padding: 16px 18px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(14, 12, 26, 0.98), rgba(10, 10, 20, 0.96));
  text-align: left;
  box-shadow: var(--shadow-card), 0 10px 28px rgba(0, 0, 0, 0.22);
  transition:
    border-color 180ms var(--ease-smooth),
    background   180ms var(--ease-smooth),
    box-shadow   180ms var(--ease-smooth),
    transform    180ms var(--ease-spring);
}

/* left accent stripe */
.choice-button::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: transparent;
  border-radius: 0 3px 3px 0;
  transition: background 180ms var(--ease-smooth);
}

.choice-button:hover:not(:disabled) {
  border-color: rgba(167, 139, 250, 0.22);
  background: rgba(167, 139, 250, 0.04);
  box-shadow: var(--shadow-card), 0 14px 36px rgba(0, 0, 0, 0.3);
}

.choice-button.selected {
  border-color: rgba(167, 139, 250, 0.36);
  background: linear-gradient(160deg, rgba(124, 92, 240, 0.12), rgba(76, 46, 171, 0.06));
  box-shadow: 0 0 0 1px rgba(167, 139, 250, 0.14) inset, 0 14px 36px rgba(0, 0, 0, 0.3);
}

.choice-button.selected::before { background: var(--accent); }

.choice-button.correct {
  border-color: rgba(110, 231, 183, 0.3);
  background: linear-gradient(160deg, rgba(10, 30, 22, 0.98), rgba(6, 20, 16, 0.98));
  box-shadow: 0 0 0 1px rgba(110, 231, 183, 0.1) inset, 0 0 30px rgba(110, 231, 183, 0.08);
}

.choice-button.correct::before { background: var(--success); box-shadow: 0 0 8px rgba(110,231,183,0.6); }

.choice-button.incorrect {
  border-color: rgba(251, 146, 60, 0.32);
  background: linear-gradient(160deg, rgba(40, 18, 10, 0.98), rgba(28, 14, 8, 0.98));
  box-shadow: 0 0 0 1px rgba(251, 146, 60, 0.08) inset, 0 0 30px rgba(251, 146, 60, 0.06);
}

.choice-button.incorrect::before { background: var(--warm); box-shadow: 0 0 8px rgba(251,146,60,0.5); }

/* ─────────────────────────────────────────────
   CHOICE KEY & TEXT
───────────────────────────────────────────── */
.choice-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: linear-gradient(160deg, rgba(24, 20, 42, 1), rgba(14, 12, 28, 0.96));
  border: 1px solid rgba(167, 139, 250, 0.16);
  color: var(--accent);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.02em;
  box-shadow: 0 1px 0 rgba(255,255,255,0.06) inset, 0 2px 8px rgba(0,0,0,0.4);
}

.choice-text {
  font-family: "Manrope", sans-serif;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.72;
  letter-spacing: -0.01em;
  color: var(--ink);
  padding-top: 4px;
}

/* ─────────────────────────────────────────────
   TOOLBAR & BUTTON ROWS
───────────────────────────────────────────── */
.part-toolbar, .status-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.status-row { margin-top: 4px; }

.mini-button {
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(16, 14, 28, 0.96), rgba(10, 10, 20, 0.92));
  color: var(--ink);
  font-weight: 600;
  font-size: 14px;
}

.mini-button:hover:not(:disabled) {
  border-color: var(--line-strong);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

.mini-button.primary {
  background: linear-gradient(135deg, #a78bfa, #7c5cf0 60%, #5b3fcc);
  color: #fff;
  border-color: rgba(167, 139, 250, 0.5);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.1) inset,
    0 12px 32px rgba(124, 92, 240, 0.35);
}

.mini-button.primary:hover:not(:disabled) {
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.14) inset,
    0 16px 42px rgba(124, 92, 240, 0.48);
}

/* ─────────────────────────────────────────────
   FEEDBACK PANEL
───────────────────────────────────────────── */
.feedback-panel {
  margin-top: 18px;
  padding: 22px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: rgba(10, 10, 20, 0.72);
  animation: fadeSlideUp 220ms var(--ease-out) both;
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.feedback-panel.correct {
  background: rgba(6, 22, 16, 0.72);
  border-color: rgba(110, 231, 183, 0.2);
  box-shadow: 0 0 40px rgba(110, 231, 183, 0.06);
}

.feedback-panel.incorrect {
  background: rgba(30, 14, 10, 0.72);
  border-color: rgba(251, 146, 60, 0.22);
  box-shadow: 0 0 40px rgba(251, 146, 60, 0.06);
}

.feedback-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
  color: var(--muted);
}

.feedback-badge.correct {
  background: var(--success-soft);
  color: var(--success);
  border: 1px solid rgba(110, 231, 183, 0.2);
}

.feedback-badge.incorrect {
  background: var(--warm-soft);
  color: var(--warm);
  border: 1px solid rgba(251, 146, 60, 0.2);
}

.feedback-content { display: grid; gap: 10px; }

.feedback-line {
  font-size: 16px;
  line-height: 1.76;
}

/* ─────────────────────────────────────────────
   ACTION ROW
───────────────────────────────────────────── */
.action-row, .status-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.action-row button, .status-row button {
  flex: 1 1 180px;
  padding: 14px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(16, 14, 28, 0.96), rgba(10, 10, 20, 0.92));
  font-weight: 600;
}

.status-button.mastered {
  background: var(--accent-soft);
  border-color: rgba(167, 139, 250, 0.24);
  color: var(--accent);
}

.status-button.review {
  background: var(--warm-soft);
  border-color: rgba(251, 146, 60, 0.22);
  color: var(--warm);
}

.status-button.neutral { background: rgba(167, 139, 250, 0.06); }

/* ─────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────── */
@media (max-width: 1180px) {
  .hero, .workspace { grid-template-columns: 1fr; }
  .hero-panel-wide  { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 720px) {
  .page-shell { padding: 20px 16px 40px; }

  .hero-copy, .hero-panel, .control-panel,
  .practice-stage, .auth-card { border-radius: 22px; }

  .hero-copy, .practice-stage, .panel-block, .auth-card { padding: 22px 20px; }

  .hero-panel-wide { grid-template-columns: 1fr 1fr; }

  .panel-heading,
  .record-topline, .hero-topline { flex-direction: column; align-items: start; }

  .stage-topbar {
    grid-template-columns: 1fr;
  }

  .inline-field { grid-template-columns: 1fr; }
}

/* ─────────────────────────────────────────────
   LIGHT THEME
───────────────────────────────────────────── */
html[data-theme="light"] {
  color-scheme: light;

  --bg:             #f4f6ff;
  --paper:          rgba(255, 255, 255, 0.82);
  --paper-strong:   rgba(255, 255, 255, 0.96);
  --glass:          rgba(255, 255, 255, 0.6);
  --glass-strong:   rgba(255, 255, 255, 0.8);
  --ink:            #1a1435;
  --muted:          #7b77a0;
  --subtle:         #c2bedd;
  --line:           rgba(90, 60, 200, 0.1);
  --line-strong:    rgba(90, 60, 200, 0.2);
  --accent:         #6d40e8;
  --accent-mid:     #5a30d8;
  --accent-deep:    #3d1db8;
  --accent-glow:    rgba(109, 64, 232, 0.28);
  --accent-soft:    rgba(109, 64, 232, 0.1);
  --shadow:         0 24px 80px rgba(90, 60, 200, 0.12), 0 4px 16px rgba(90, 60, 200, 0.06);
  --shadow-soft:    0 12px 40px rgba(90, 60, 200, 0.09), 0 2px 8px rgba(90, 60, 200, 0.04);
  --shadow-card:    0 1px 0 rgba(255,255,255,0.9) inset, 0 -1px 0 rgba(90,60,200,0.06) inset;
}

html[data-theme="light"] body {
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 60% at 10% 0%,   rgba(109, 64, 232, 0.14) 0%, transparent 55%),
    radial-gradient(ellipse 60% 50% at 92% 8%,    rgba(109, 64, 232, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 50% 100%,  rgba(109, 64, 232, 0.07) 0%, transparent 55%),
    linear-gradient(180deg, #f6f8ff 0%, #f2f5ff 50%, #eef2ff 100%);
}

html[data-theme="light"] body::before {
  opacity: 0.022;
}

html[data-theme="light"] body::after {
  background: radial-gradient(circle at 60% 40%, rgba(109, 64, 232, 0.08), transparent 68%);
}

html[data-theme="light"] input,
html[data-theme="light"] select {
  background: rgba(255, 255, 255, 0.96);
  color: var(--ink);
  box-shadow: var(--shadow-card);
}

html[data-theme="light"] input:focus,
html[data-theme="light"] select:focus {
  border-color: var(--accent-mid);
  box-shadow: 0 0 0 3px rgba(109, 64, 232, 0.12), var(--shadow-card);
}

html[data-theme="light"] .auth-overlay {
  background: rgba(20, 10, 50, 0.24);
}

html[data-theme="light"] .auth-card {
  background: linear-gradient(160deg, rgba(255,255,255,0.98), rgba(248,246,255,0.96));
  box-shadow: 0 40px 100px rgba(90, 60, 200, 0.2), 0 0 0 1px rgba(109,64,232,0.06) inset;
}

html[data-theme="light"] .hero-copy,
html[data-theme="light"] .hero-panel,
html[data-theme="light"] .control-panel,
html[data-theme="light"] .practice-stage {
  border-color: rgba(109, 64, 232, 0.12);
}

html[data-theme="light"] .hero-copy {
  background: linear-gradient(150deg, rgba(255,255,255,0.96), rgba(248,246,255,0.88));
}

html[data-theme="light"] .hero h1 {
  background: linear-gradient(135deg, #1a1435 30%, #6d40e8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

html[data-theme="light"] .theme-toggle {
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,246,255,0.94));
  color: var(--ink);
  box-shadow: 0 8px 24px rgba(90,60,200,0.1), 0 1px 0 rgba(255,255,255,0.9) inset;
}

html[data-theme="light"] .hero-panel {
  background: linear-gradient(180deg, rgba(255,255,255,0.88), rgba(248,246,255,0.94));
}

html[data-theme="light"] .stat-card {
  background: linear-gradient(160deg, rgba(255,255,255,0.98), rgba(248,246,255,0.92));
  box-shadow: var(--shadow-card), 0 4px 16px rgba(90,60,200,0.06);
}

html[data-theme="light"] .stat-card strong {
  background: linear-gradient(135deg, #1a1435 40%, #6d40e8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

html[data-theme="light"] .control-panel {
  background: linear-gradient(180deg, rgba(255,255,255,0.86), rgba(248,246,255,0.92));
}

html[data-theme="light"] .panel-block,
html[data-theme="light"] .question-card {
  background: linear-gradient(160deg, rgba(255,255,255,0.98), rgba(249,247,255,0.96));
}

html[data-theme="light"] .ghost-button,
html[data-theme="light"] .mini-button:not(.primary),
html[data-theme="light"] .action-row button,
html[data-theme="light"] .status-row button {
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,246,255,0.94));
  color: var(--ink);
}

html[data-theme="light"] .primary-button,
html[data-theme="light"] .mini-button.primary {
  background: linear-gradient(135deg, #7c52f2, #5a30d8 60%, #3d1db8);
  color: #fff;
  border-color: rgba(109, 64, 232, 0.4);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.2) inset,
    0 14px 36px rgba(109, 64, 232, 0.36);
}

html[data-theme="light"] kbd {
  background: rgba(255, 255, 255, 0.96);
  border-color: rgba(109, 64, 232, 0.18);
  color: var(--accent);
}

html[data-theme="light"] .progress-chip { background: rgba(255,255,255,0.96); }
html[data-theme="light"] .progress-rail { background: rgba(109, 64, 232, 0.08); }

html[data-theme="light"] .question-list-item {
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(249,247,255,0.92));
}

html[data-theme="light"] .question-list-item.active {
  border-color: rgba(109, 64, 232, 0.28);
  background: linear-gradient(180deg, rgba(109, 64, 232, 0.08), rgba(90, 60, 200, 0.04));
}

html[data-theme="light"] .sync-pill,
html[data-theme="light"] .muted-chip,
html[data-theme="light"] .record-badge {
  background: rgba(109, 64, 232, 0.08);
  border-color: rgba(109, 64, 232, 0.14);
}

html[data-theme="light"] .practice-stage {
  background: linear-gradient(160deg, rgba(255,255,255,0.88), rgba(248,246,255,0.94));
}

html[data-theme="light"] .part-card {
  background: linear-gradient(160deg, rgba(255,255,255,0.96), rgba(249,247,255,0.98));
  box-shadow: var(--shadow-card);
}

html[data-theme="light"] .choice-button {
  background: linear-gradient(160deg, rgba(255,255,255,0.98), rgba(249,247,255,0.94));
  box-shadow: var(--shadow-card), 0 10px 28px rgba(90,60,200,0.04);
}

html[data-theme="light"] .choice-button:hover:not(:disabled) {
  background: rgba(109, 64, 232, 0.04);
  border-color: rgba(109, 64, 232, 0.22);
}

html[data-theme="light"] .choice-button.selected {
  background: linear-gradient(160deg, rgba(109, 64, 232, 0.1), rgba(90, 60, 200, 0.06));
}

html[data-theme="light"] .choice-button.correct {
  background: linear-gradient(160deg, rgba(240,255,248,0.98), rgba(228,255,242,0.98));
}

html[data-theme="light"] .choice-button.incorrect {
  background: linear-gradient(160deg, rgba(255,245,238,0.98), rgba(255,234,222,0.98));
}

html[data-theme="light"] .choice-key {
  background: linear-gradient(160deg, rgba(238,232,255,1), rgba(222,210,255,0.96));
  border-color: rgba(109, 64, 232, 0.2);
  color: var(--accent);
}

html[data-theme="light"] .choice-text { color: var(--ink); }

html[data-theme="light"] .record-item,
html[data-theme="light"] .empty-records {
  background: rgba(255,255,255,0.94);
}

html[data-theme="light"] .feedback-panel {
  background: rgba(255,255,255,0.6);
}

html[data-theme="light"] .feedback-panel.correct {
  background: rgba(230,255,244,0.72);
  border-color: rgba(110, 231, 183, 0.3);
}

html[data-theme="light"] .feedback-panel.incorrect {
  background: rgba(255,240,232,0.72);
  border-color: rgba(251, 146, 60, 0.28);
}

html[data-theme="light"] .status-button.mastered {
  background: rgba(109, 64, 232, 0.1);
  color: var(--accent);
}

html[data-theme="light"] .status-button.review {
  background: rgba(251, 146, 60, 0.1);
  color: var(--warm);
}

html[data-theme="light"] .status-button.neutral {
  background: rgba(109, 64, 232, 0.04);
}