/* ============================================================
   HamForge — Apple-level Design System
   Light / Dark / System + Glass + Refined Motion
   ============================================================ */

:root {
  /* Shared */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --font-q: 19px;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-spring: cubic-bezier(0.34, 1.3, 0.64, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);

  /* Dark (default) */
  --bg: #000000;
  --bg-elevated: #0a0a0b;
  --bg-card: rgba(22, 22, 24, 0.72);
  --bg-card-solid: #141416;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text-primary: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-tertiary: #6e6e73;
  --accent: #0a84ff;
  --accent-soft: rgba(10, 132, 255, 0.18);
  --success: #30d158;
  --success-soft: rgba(48, 209, 88, 0.16);
  --warning: #ff9f0a;
  --danger: #ff453a;
  --danger-soft: rgba(255, 69, 58, 0.16);
  --glass: blur(20px) saturate(160%);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
  --ambient-1: rgba(10, 132, 255, 0.11);
  --ambient-2: rgba(48, 209, 88, 0.04);
}

/* Light theme */
[data-theme="light"] {
  --bg: #f2f2f7;
  --bg-elevated: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-solid: #ffffff;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --text-primary: #1c1c1e;
  --text-secondary: #3a3a3c;
  --text-tertiary: #8e8e93;
  --accent: #007aff;
  --accent-soft: rgba(0, 122, 255, 0.12);
  --success: #34c759;
  --success-soft: rgba(52, 199, 89, 0.14);
  --warning: #ff9500;
  --danger: #ff3b30;
  --danger-soft: rgba(255, 59, 48, 0.12);
  --glass: blur(20px) saturate(180%);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
  --ambient-1: rgba(0, 122, 255, 0.06);
  --ambient-2: rgba(52, 199, 89, 0.03);
}

/* System preference when data-theme="system" */
@media (prefers-color-scheme: light) {
  [data-theme="system"] {
    --bg: #f2f2f7;
    --bg-elevated: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.72);
    --bg-card-solid: #ffffff;
    --border: rgba(0, 0, 0, 0.08);
    --border-strong: rgba(0, 0, 0, 0.14);
    --text-primary: #1c1c1e;
    --text-secondary: #3a3a3c;
    --text-tertiary: #8e8e93;
    --accent: #007aff;
    --accent-soft: rgba(0, 122, 255, 0.12);
    --success: #34c759;
    --success-soft: rgba(52, 199, 89, 0.14);
    --warning: #ff9500;
    --danger: #ff3b30;
    --danger-soft: rgba(255, 59, 48, 0.12);
    --glass: blur(20px) saturate(180%);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
    --ambient-1: rgba(0, 122, 255, 0.06);
    --ambient-2: rgba(52, 199, 89, 0.03);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text-primary);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.35s var(--ease), color 0.35s var(--ease);
}

.ambient {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--ambient-1), transparent),
    radial-gradient(ellipse 50% 30% at 90% 110%, var(--ambient-2), transparent);
  pointer-events: none;
  z-index: 0;
}

.app {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  max-width: 480px;
  margin: 0 auto;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
}

/* Top Bar */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px 6px;
}

.brand { display: flex; align-items: center; gap: 10px; }

.brand-mark {
  width: 26px; height: 26px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), #64d2ff);
  box-shadow: 0 0 18px color-mix(in srgb, var(--accent) 40%, transparent);
}

.brand-name {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.top-actions { display: flex; gap: 2px; }

.icon-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.22s var(--ease-spring);
}
.icon-btn:active {
  background: color-mix(in srgb, var(--text-primary) 8%, transparent);
  color: var(--text-primary);
  transform: scale(0.9);
}

/* Class Nav */
.class-nav {
  display: flex;
  gap: 6px;
  padding: 6px 18px 10px;
  overflow-x: auto;
  scrollbar-width: none;
}
.class-nav::-webkit-scrollbar { display: none; }

.class-pill {
  flex-shrink: 0;
  padding: 7px 16px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s var(--ease-spring);
}
.class-pill.active {
  background: var(--text-primary);
  color: var(--bg);
  border-color: transparent;
  font-weight: 600;
}

/* Mode Tabs */
.mode-tabs {
  display: flex;
  gap: 4px;
  padding: 0 18px 12px;
}

.mode-tab {
  flex: 1;
  height: 36px;
  border-radius: 10px;
  border: none;
  background: color-mix(in srgb, var(--text-primary) 5%, transparent);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.22s var(--ease-spring);
}
.mode-tab.active {
  background: color-mix(in srgb, var(--text-primary) 12%, transparent);
  color: var(--text-primary);
  font-weight: 600;
}

/* Stage */
.stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 0 18px 12px;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

/* Stats — glass */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}

.stat {
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 6px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.stat-value {
  display: block;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  display: block;
  font-size: 10px;
  font-weight: 500;
  color: var(--text-tertiary);
  margin-top: 2px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* Question */
.question-area { margin-bottom: 16px; }

.q-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

.q-text {
  font-size: var(--font-q);
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* Choices — large + glass */
.choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding-bottom: 8px;
}

.choice-btn {
  min-height: 64px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  color: var(--text-primary);
  font-size: calc(var(--font-q) - 2px);
  font-weight: 500;
  line-height: 1.35;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  transition: transform 0.18s var(--ease-spring),
              background 0.2s var(--ease),
              border-color 0.2s var(--ease),
              color 0.2s var(--ease);
  box-shadow: var(--shadow-card);
}

.choice-btn:active:not(.disabled) { transform: scale(0.975); }

.choice-letter {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--text-primary) 8%, transparent);
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  transition: all 0.2s var(--ease);
}

.choice-text { flex: 1; padding-top: 2px; }

.choice-btn.correct {
  background: var(--success-soft);
  border-color: color-mix(in srgb, var(--success) 50%, transparent);
  color: var(--success);
}
.choice-btn.correct .choice-letter {
  background: var(--success);
  color: #000;
}

.choice-btn.wrong {
  background: var(--danger-soft);
  border-color: color-mix(in srgb, var(--danger) 45%, transparent);
  color: var(--danger);
}
.choice-btn.wrong .choice-letter {
  background: var(--danger);
  color: #fff;
}

.choice-btn.disabled { pointer-events: none; }
.choice-btn.show-correct:not(.correct):not(.wrong) { opacity: 0.45; }

/* Flash */
.flash-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.card {
  flex: 1;
  max-height: 280px;
  perspective: 1200px;
  cursor: pointer;
  margin-bottom: 14px;
}

.card-inner {
  width: 100%; height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s var(--ease-spring);
}

.card.flipped .card-inner { transform: rotateY(180deg); }

.card-front, .card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-xl);
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
}

.card-back {
  transform: rotateY(180deg);
  border-color: color-mix(in srgb, var(--success) 25%, var(--border));
}

.card-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.card-question, .card-answer {
  flex: 1;
  font-size: var(--font-q);
  font-weight: 500;
  line-height: 1.4;
  overflow-y: auto;
}

.card-answer { color: var(--success); font-weight: 600; }

.card-hint {
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-tertiary);
  text-align: center;
}

.flash-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.action-btn {
  height: 52px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
}
.action-btn:active { transform: scale(0.97); }
.action-btn.need-review:active {
  background: color-mix(in srgb, var(--warning) 14%, transparent);
  border-color: color-mix(in srgb, var(--warning) 35%, transparent);
  color: var(--warning);
}
.action-btn.know-it:active {
  background: var(--success-soft);
  border-color: color-mix(in srgb, var(--success) 35%, transparent);
  color: var(--success);
}

.flash-read-answer {
  margin-top: 10px;
  width: 100%;
  height: 48px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
}
.flash-read-answer:active,
.flash-read-answer.speaking {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

/* Feedback */
.feedback {
  position: absolute;
  left: 50%;
  bottom: 110px;
  transform: translateX(-50%);
  padding: 10px 22px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  z-index: 20;
  animation: fadeUp 0.4s var(--ease-spring);
  pointer-events: none;
}
.feedback.good { background: var(--success); color: #000; }
.feedback.bad { background: var(--danger); color: #fff; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateX(-50%) translateY(14px) scale(0.96); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0) scale(1); }
}

/* Bottom Bar */
.bottom-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 18px;
  padding-top: 8px;
}

.ctrl-btn {
  width: 48px; height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  color: var(--text-primary);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: transform 0.2s var(--ease-spring), background 0.2s var(--ease);
}
.ctrl-btn:active { transform: scale(0.9); }

.ctrl-btn.primary {
  width: 58px; height: 58px;
  background: var(--accent);
  border: none;
  color: #fff;
  box-shadow: 0 4px 20px color-mix(in srgb, var(--accent) 40%, transparent);
}
.ctrl-btn.primary.speaking {
  background: var(--success);
  box-shadow: 0 4px 20px color-mix(in srgb, var(--success) 40%, transparent);
}

/* Driving */
.driving-mode {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  padding: calc(var(--safe-top) + 16px) 20px calc(var(--safe-bottom) + 20px);
}

.driving-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.driving-badge {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--warning);
  background: color-mix(in srgb, var(--warning) 12%, transparent);
  padding: 6px 12px;
  border-radius: 100px;
}

.driving-question {
  font-size: 22px;
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 24px;
  max-height: 30vh;
  overflow-y: auto;
}

.driving-choices {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
}
.driving-choices .choice-btn { min-height: 72px; font-size: 17px; }

.driving-tts {
  margin-top: 16px;
  height: 60px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  cursor: pointer;
}
.driving-tts.speaking {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

/* Settings */
.settings-panel {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  backdrop-filter: blur(28px) saturate(160%);
  -webkit-backdrop-filter: blur(28px) saturate(160%);
  display: flex;
  flex-direction: column;
  padding: calc(var(--safe-top) + 20px) 22px calc(var(--safe-bottom) + 24px);
  max-width: 480px;
  margin: 0 auto;
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}
.settings-header h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.settings-group { margin-bottom: 26px; }
.settings-group.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.setting-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.settings-group.row .setting-label { margin-bottom: 0; }

/* Theme switcher */
.theme-switcher {
  display: flex;
  gap: 6px;
  background: color-mix(in srgb, var(--text-primary) 6%, transparent);
  padding: 4px;
  border-radius: 12px;
}

.theme-opt {
  flex: 1;
  height: 34px;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.22s var(--ease-spring);
}
.theme-opt.active {
  background: var(--bg-card-solid);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: 0 1px 4px rgba(0,0,0,0.12);
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: color-mix(in srgb, var(--text-primary) 12%, transparent);
  border-radius: 100px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  cursor: pointer;
}

.slider-value {
  font-size: 14px;
  font-weight: 500;
  min-width: 48px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}

.toggle {
  position: relative;
  width: 51px; height: 31px;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-track {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--text-primary) 12%, transparent);
  border-radius: 100px;
  transition: 0.25s var(--ease);
  cursor: pointer;
}
.toggle-track::before {
  content: "";
  position: absolute;
  width: 27px; height: 27px;
  left: 2px; top: 2px;
  background: #fff;
  border-radius: 50%;
  transition: 0.25s var(--ease-spring);
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}
.toggle input:checked + .toggle-track { background: var(--success); }
.toggle input:checked + .toggle-track::before { transform: translateX(20px); }

.danger-btn {
  width: 100%;
  height: 48px;
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent);
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
}

[hidden] { display: none !important; }

@media (max-height: 720px) {
  .stats-bar { margin-bottom: 10px; }
  .choice-btn { min-height: 56px; padding: 12px 14px; }
}

/* ============================================================
   Login + Home Dashboard
   ============================================================ */

.screen {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  flex-direction: column;
  max-width: 480px;
  margin: 0 auto;
  background: var(--bg);
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
}

/* Login */
.login-screen {
  justify-content: flex-start;
  padding: 48px 28px 16px;
}

.login-inner {
  margin-top: auto;
  margin-bottom: auto;
  width: 100%;
}

.login-brand {
  text-align: center;
  margin-bottom: 48px;
}

.login-mark {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--accent), #64d2ff);
  box-shadow: 0 8px 32px color-mix(in srgb, var(--accent) 35%, transparent);
}

.login-brand h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.04em;
  margin-bottom: 6px;
}

.login-brand p {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 400;
}

.login-form .field {
  margin-bottom: 18px;
}

.login-form label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.login-form input {
  width: 100%;
  height: 52px;
  padding: 0 16px;
  border-radius: 14px;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  color: var(--text-primary);
  font-size: 16px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s var(--ease);
}

.login-form input:focus {
  border-color: var(--accent);
}

.login-form input::placeholder {
  color: var(--text-tertiary);
}

.btn-primary {
  width: 100%;
  height: 52px;
  margin-top: 12px;
  border: none;
  border-radius: 14px;
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 4px 20px color-mix(in srgb, var(--accent) 40%, transparent);
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s var(--ease);
}

.btn-primary:active {
  transform: scale(0.98);
}

.login-error {
  margin-top: 16px;
  text-align: center;
  font-size: 14px;
  color: var(--danger);
  font-weight: 500;
}

/* Home */
.home-screen {
  padding: 16px 20px 32px;
  overflow-y: auto;
}

.home-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 28px;
}

.home-greeting {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.home-name {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

/* Animated Rings */
.rings {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.ring-card {
  position: relative;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ring-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: color-mix(in srgb, var(--text-primary) 8%, transparent);
  stroke-width: 8;
}

.ring-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.1s var(--ease-out);
}

.ring-fill.ring-general { stroke: #30d158; }
.ring-fill.ring-extra { stroke: #ff9f0a; }

.ring-label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.ring-pct {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.ring-name {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

/* Home stats */
.home-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 32px;
}

.home-stat {
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 10px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.home-stat-value {
  display: block;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.home-stat-label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.section-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.home-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.home-class-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
  box-shadow: var(--shadow-card);
}

.home-class-btn:active {
  transform: scale(0.98);
  border-color: var(--accent);
}

.hcb-title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.hcb-sub {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Pass threshold indicator */
.pass-indicator {
  margin: -6px 0 14px;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: color-mix(in srgb, var(--text-primary) 5%, transparent);
  border: 1px solid var(--border);
  text-align: center;
}

.pass-indicator strong {
  color: var(--text-primary);
  font-weight: 600;
}

.pass-indicator.on-track {
  background: var(--success-soft);
  border-color: color-mix(in srgb, var(--success) 30%, transparent);
  color: var(--success);
}

.pass-indicator.below {
  background: color-mix(in srgb, var(--warning) 10%, transparent);
  border-color: color-mix(in srgb, var(--warning) 25%, transparent);
  color: var(--warning);
}

.pass-ok, .pass-gap {
  font-weight: 600;
  margin-left: 4px;
}

/* Logo */
.login-logo {
  display: block;
  width: 220px;
  max-width: 80%;
  height: auto;
  margin: 0 auto 16px;
}

.brand-logo {
  height: 28px;
  width: auto;
  display: block;
}

/* Footer */
.site-footer {
  margin-top: auto;
  padding: 20px 12px 16px;
  text-align: center;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  letter-spacing: 0.01em;
  flex-shrink: 0;
  width: 100%;
}

.study-footer {
  padding-bottom: calc(12px + var(--safe-bottom));
}

.login-screen,
.home-screen {
  display: flex;
  flex-direction: column;
}

.home-screen {
  padding-bottom: 8px;
}

/* Subelement filters */
.sub-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 18px 14px;
  justify-content: flex-start;
}

.sub-chip {
  padding: 7px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--text-primary) 6%, transparent);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s var(--ease);
  letter-spacing: 0.03em;
  min-width: 40px;
  text-align: center;
}
.sub-chip:hover {
  background: color-mix(in srgb, var(--text-primary) 10%, transparent);
  color: var(--text-primary);
}
.sub-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 2px 12px color-mix(in srgb, var(--accent) 35%, transparent);
}
.sub-chip:active { transform: scale(0.96); }

/* Mode tabs - allow wrap for 4 items */
.mode-tabs {
  flex-wrap: wrap;
}
.mode-tab {
  min-width: calc(50% - 4px);
}
@media (min-width: 400px) {
  .mode-tab { min-width: 0; flex: 1; }
}

/* Exam results */
.exam-results {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.exam-results-card {
  width: 100%;
  max-width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.exam-score-big {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 12px;
}

.exam-pass-badge {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.exam-pass-badge.pass {
  background: var(--success-soft);
  color: var(--success);
}
.exam-pass-badge.fail {
  background: var(--danger-soft);
  color: var(--danger);
}

.exam-detail {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.5;
}

.exam-results-card .btn-primary {
  margin-bottom: 10px;
}

.btn-secondary {
  width: 100%;
  height: 48px;
  margin-bottom: 8px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
}
.btn-secondary:active { background: color-mix(in srgb, var(--text-primary) 6%, transparent); }

/* Clickable brand / home */
button.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  border: none;
  background: transparent;
  padding: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
button.brand:active {
  opacity: 0.7;
}

/* Driving controls */
.driving-controls {
  margin-bottom: 16px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.driving-font-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}
.driving-font-row input[type="range"] { flex: 1; }
.driving-font-row span {
  min-width: 40px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}

.driving-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* driving font scale handled above */

/* Driving body with side tap zones */
.driving-body {
  flex: 1;
  display: flex;
  min-height: 0;
  gap: 0;
  position: relative;
}

.driving-side {
  width: 56px;
  flex-shrink: 0;
  border: none;
  background: color-mix(in srgb, var(--text-primary) 4%, transparent);
  color: var(--text-tertiary);
  font-size: 42px;
  font-weight: 300;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s var(--ease), color 0.15s var(--ease);
  -webkit-tap-highlight-color: transparent;
  border-radius: 12px;
}
.driving-side:active {
  background: var(--accent-soft);
  color: var(--accent);
}

.driving-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  padding: 0 6px;
}

.driving-center .driving-question {
  margin-bottom: 16px;
  max-height: 28vh;
  overflow-y: auto;
}

.driving-center .driving-choices {
  flex: 1;
  overflow-y: auto;
}

.driving-bottom {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  margin-top: 14px;
  align-items: center;
}

.driving-nav-btn {
  height: 64px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: transform 0.15s var(--ease), background 0.15s var(--ease);
}
.driving-nav-btn:active {
  transform: scale(0.97);
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.driving-bottom .driving-tts {
  margin-top: 0;
  width: 72px;
  height: 72px;
  min-width: 72px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 20px color-mix(in srgb, var(--accent) 40%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: row;
}
.driving-bottom .driving-tts:active {
  transform: scale(0.94);
}
.driving-bottom .driving-tts.speaking {
  background: var(--success);
  box-shadow: 0 4px 20px color-mix(in srgb, var(--success) 40%, transparent);
}

/* Scale entire driving UI with font slider */
.driving-mode {
  --driving-font: 22px;
  font-size: var(--driving-font);
}
.driving-mode .driving-badge {
  font-size: calc(var(--driving-font) * 0.55);
}
.driving-mode .driving-controls {
  font-size: calc(var(--driving-font) * 0.65);
}
.driving-mode .driving-font-row,
.driving-mode .driving-toggle-row {
  font-size: calc(var(--driving-font) * 0.65);
}
.driving-mode .driving-question {
  font-size: var(--driving-font);
  line-height: 1.35;
}
.driving-mode .driving-choices .choice-btn {
  font-size: calc(var(--driving-font) * 0.9);
  min-height: calc(var(--driving-font) * 3.2);
  padding: calc(var(--driving-font) * 0.7) calc(var(--driving-font) * 0.85);
}
.driving-mode .driving-choices .choice-letter {
  width: calc(var(--driving-font) * 1.7);
  height: calc(var(--driving-font) * 1.7);
  font-size: calc(var(--driving-font) * 0.75);
}
.driving-mode .driving-nav-btn {
  height: calc(var(--driving-font) * 2.8);
  min-height: 56px;
  font-size: calc(var(--driving-font) * 0.75);
}
.driving-mode .driving-side {
  font-size: calc(var(--driving-font) * 1.8);
  width: calc(var(--driving-font) * 2.4);
}