:root {
  color-scheme: dark;
  --font-size-base: 16px;
  --bg: #060816;
  --bg-soft: #0f172a;
  --surface: rgba(15, 23, 42, 0.72);
  --surface-strong: rgba(255, 255, 255, 0.12);
  --text: #f8fafc;
  --muted: #9ba7c4;
  --accent: #7c4dff;
  --accent-2: #22d3ee;
  --border: rgba(255, 255, 255, 0.16);
  --shadow: 0 24px 70px rgba(2, 6, 23, 0.35);
}

html[data-theme='light'] {
  color-scheme: light;
  --bg: #f4f7ff;
  --bg-soft: #eef2ff;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: rgba(255, 255, 255, 0.9);
  --text: #111827;
  --muted: #5b6478;
  --accent: #6d28d9;
  --accent-2: #0891b2;
  --border: rgba(15, 23, 42, 0.08);
  --shadow: 0 24px 70px rgba(99, 102, 241, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
}

body {
  margin: 0;
  font-family: Inter, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(124, 77, 255, 0.24), transparent 24%),
    radial-gradient(circle at bottom right, rgba(34, 211, 238, 0.18), transparent 26%),
    var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
  font-size: var(--font-size-base);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.03), transparent 60%);
}

img {
  max-width: 100%;
}

.page-shell {
  width: min(1200px, calc(100% - 1.5rem));
  margin: 0 auto;
  padding-bottom: 2rem;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  margin-top: 1rem;
  padding: 0.95rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: 0 10px 30px rgba(124, 77, 255, 0.28);
}

.nav-links,
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  transition: color 180ms ease, transform 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a.active {
  color: var(--text);
  transform: translateY(-1px);
}

.nav-links a.active {
  position: relative;
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 0.2rem;
  right: 0.2rem;
  bottom: -0.35rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.theme-toggle,
.primary-btn,
.secondary-btn,
.ghost-btn,
.danger-btn {
  border: none;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.theme-toggle {
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  background: var(--surface-strong);
  color: var(--text);
}

.primary-btn,
.secondary-btn,
.ghost-btn,
.danger-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1rem;
  text-decoration: none;
  font-weight: 700;
}

.primary-btn {
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 12px 25px rgba(124, 77, 255, 0.24);
}

.secondary-btn {
  color: var(--text);
  background: var(--surface-strong);
  border: 1px solid var(--border);
}

.ghost-btn {
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
}

.danger-btn {
  color: #fff;
  background: linear-gradient(135deg, #f43f5e, #fb923c);
}

.theme-toggle:hover,
.primary-btn:hover,
.secondary-btn:hover,
.ghost-btn:hover,
.danger-btn:hover,
.theme-toggle:focus-visible,
.primary-btn:focus-visible,
.secondary-btn:focus-visible,
.ghost-btn:focus-visible,
.danger-btn:focus-visible {
  transform: translateY(-2px);
}

.view-panel[hidden] {
  display: none !important;
}

.view-panel {
  animation: fadeIn 280ms ease both;
}

.page-card {
  padding: 2rem;
  border-radius: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.page-card h1 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.7rem, 3vw, 2.3rem);
}

.page-text {
  margin: 0 0 1rem;
  color: var(--muted);
  line-height: 1.7;
}

.page-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--muted);
  font-size: 0.95rem;
}

.page-list {
  display: grid;
  gap: 0.7rem;
  margin-top: 0.8rem;
}

.page-list-item {
  padding: 0.8rem 0.9rem;
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.hero {
  display: grid;
  gap: 1.5rem;
  align-items: center;
  padding: 4rem 0 2rem;
}

.eyebrow {
  margin: 0 0 0.7rem;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.08;
}

.hero-text {
  margin: 0;
  max-width: 620px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 1.4rem 0;
}

.primary-btn.large,
.secondary-btn.large {
  padding: 0.95rem 1.3rem;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.hero-badges span {
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}

.hero-preview {
  animation: float 5s ease-in-out infinite;
}

.preview-card {
  padding: 1.2rem;
  border-radius: 1.4rem;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.05));
  border: 1px solid var(--border);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: var(--shadow);
}

.preview-toolbar {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.preview-toolbar span {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
}

.preview-label {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.typing-preview {
  min-height: 120px;
  padding: 1rem;
  border-radius: 1rem;
  background: rgba(2, 6, 23, 0.35);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.7;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.typing-preview::after {
  content: '|';
  color: var(--accent-2);
  animation: blink 0.9s infinite;
}

.preview-progress {
  margin-top: 1rem;
}

.progress-track {
  height: 0.5rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.progress-fill {
  display: block;
  width: 74%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  animation: pulse 2.5s ease-in-out infinite;
}

.preview-metrics {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.preview-metrics strong {
  color: var(--text);
}

.stats-grid,
.feature-grid,
.showcase-grid {
  display: grid;
  gap: 1rem;
}

.stats-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1rem 0 2rem;
}

.stat-card,
.feature-card,
.showcase-card,
.settings-card {
  padding: 1.2rem;
  border-radius: 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.stat-card strong {
  display: block;
  font-size: 1.35rem;
  margin-bottom: 0.3rem;
}

.stat-card span {
  color: var(--muted);
}

.section-block {
  padding: 2rem 0;
}

.section-heading {
  margin-bottom: 1rem;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
}

.feature-card h3,
.showcase-card h3,
.setting-row h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.feature-card p,
.showcase-card p,
.setting-row p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.settings-view {
  padding: 2rem 0 1rem;
}

.settings-shell {
  display: grid;
  gap: 1rem;
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.setting-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.setting-row:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.control-stack {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.value-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.2rem;
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--text);
  font-weight: 700;
}

.switch {
  position: relative;
  width: 3.2rem;
  height: 1.8rem;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  cursor: pointer;
  transition: background 180ms ease;
}

.slider::before {
  content: '';
  position: absolute;
  width: 1.3rem;
  height: 1.3rem;
  left: 0.25rem;
  top: 0.25rem;
  border-radius: 50%;
  background: white;
  transition: transform 180ms ease;
}

.switch input:checked + .slider {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.switch input:checked + .slider::before {
  transform: translateX(1.4rem);
}

input[type='color'] {
  width: 3rem;
  height: 3rem;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

input[type='range'] {
  accent-color: var(--accent);
}

.settings-actions {
  margin-top: 1rem;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0 0.5rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}

.footer a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 0.7rem;
}

.nav-links a.active,
.nav-action.active,
.footer-links a.active {
  color: var(--text);
}

.practice-shell,
.page-card,
.settings-shell {
  display: grid;
  gap: 1rem;
}

.practice-header,
.settings-header,
.settings-actions,
.progress-meta,
.stats-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.practice-actions,
.control-stack,
.chip-row,
.page-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.practice-controls {
  display: grid;
  gap: 0.9rem;
  margin-bottom: 1rem;
}

.control-group {
  display: grid;
  gap: 0.45rem;
}

.control-label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.mode-chip,
.time-chip,
.auth-tab,
.auth-form button,
.ghost-btn.small {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.55rem 0.85rem;
  background: var(--surface-strong);
  color: var(--text);
  cursor: pointer;
  font: inherit;
}

.mode-chip.active,
.time-chip.active,
.auth-tab.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  border-color: transparent;
}

.practice-card,
.result-card,
.settings-card,
.lesson-card,
.leaderboard-row,
.auth-card {
  padding: 1.2rem;
  border-radius: 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.practice-card {
  position: relative;
  overflow: hidden;
}

.typing-prompt {
  min-height: 12rem;
  max-height: 24rem;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 1.3rem 1.25rem;
  border-radius: 1rem;
  background: rgba(2, 6, 23, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-family: var(--typing-font, Inter, 'Segoe UI', sans-serif);
  font-size: clamp(1.3rem, 2.1vw, 1.95rem);
  line-height: 1.8;
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
  white-space: pre-wrap;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  scroll-behavior: smooth;
}

.typing-line {
  display: block;
  line-height: 1.8;
  margin-bottom: 0.1rem;
  transition: transform 180ms ease, opacity 180ms ease;
}

.typing-line.active {
  transform: translateX(2px);
  opacity: 1;
}

.typing-prompt .char.correct {
  color: #34d399;
}

.typing-prompt .char.incorrect {
  color: #fb7185;
  text-decoration: underline;
}

.typing-prompt .char.pending {
  color: var(--muted);
}

.typing-input,
.select-control,
.auth-form input {
  width: 100%;
  min-height: 10rem;
  padding: 1.15rem 1.2rem;
  border-radius: 1rem;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-family: var(--typing-font, Inter, 'Segoe UI', sans-serif);
  font-size: clamp(1.35rem, 2.15vw, 2rem);
  line-height: 1.7;
  letter-spacing: 0.04em;
  resize: vertical;
}

.typing-input:disabled {
  opacity: 0.75;
  cursor: not-allowed;
}

.practice-complete-overlay {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: grid;
  place-items: center;
  padding: 1.2rem;
  background: rgba(2, 6, 23, 0.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.practice-complete-overlay[hidden] {
  display: none !important;
}

.practice-complete-card {
  width: min(100%, 26rem);
  padding: 2rem;
  border-radius: 1.4rem;
  text-align: center;
  background: linear-gradient(135deg, rgba(124, 77, 255, 0.22), rgba(34, 211, 238, 0.16));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.practice-complete-card h2 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 3.4vw, 2.7rem);
}

.overlay-score {
  display: grid;
  gap: 0.7rem;
  margin: 1rem 0 1.4rem;
}

.overlay-score-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 0.95rem;
  background: rgba(255, 255, 255, 0.08);
}

.overlay-score-item span {
  color: var(--muted);
  font-size: 0.95rem;
}

.overlay-score-item strong {
  color: var(--text);
  font-size: 1.3rem;
}

.stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--muted);
  font-size: 0.95rem;
}

.stat-chip strong {
  color: var(--text);
}

.stats-row.secondary {
  margin-top: 0.8rem;
}

.progress-wrap {
  margin-top: 0.9rem;
}

.progress-track {
  height: 0.5rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.progress-fill {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 180ms ease;
}

.progress-meta {
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.result-card {
  margin-top: 1rem;
}

.result-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1rem 0;
}

.result-item {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.8rem 0.9rem;
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
}

.result-item strong {
  color: var(--text);
}

.lesson-card,
.leaderboard-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.lesson-card.completed {
  border-color: rgba(52, 211, 153, 0.45);
}

.lesson-focus {
  margin: 0.35rem 0 0;
  color: var(--accent-2);
  font-size: 0.95rem;
}

.leaderboard-row {
  justify-content: space-between;
  font-size: 0.95rem;
}

.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(2, 6, 23, 0.68);
}

.auth-card {
  width: min(480px, 100%);
}

.modal-close {
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
}

.auth-tabs {
  display: flex;
  gap: 0.6rem;
  margin: 0.6rem 0 1rem;
}

.auth-form {
  display: grid;
  gap: 0.8rem;
}

.auth-form label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
}

.profile-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--text);
  font-size: 0.95rem;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes blink {
  0%,
  49% {
    opacity: 1;
  }
  50%,
  100% {
    opacity: 0;
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scaleX(1);
  }
  50% {
    transform: scaleX(1.04);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}