:root {
  --bg: #08111f;
  --bg-soft: #0d1728;
  --bg-card: rgba(14, 23, 39, 0.88);
  --bg-card-strong: rgba(18, 28, 46, 0.94);
  --bg-elevated: #162238;
  --bg-elevated-2: #1c2b43;
  --border: rgba(164, 184, 214, 0.14);
  --border-strong: rgba(250, 204, 21, 0.28);
  --text: #f4f7fb;
  --text-muted: #96a4bc;
  --text-soft: #bcc8db;
  --accent: #f5b942;
  --accent-strong: #ffcf70;
  --accent-glow: rgba(245, 185, 66, 0.18);
  --accent-surface: rgba(245, 185, 66, 0.1);
  --green: #55e6a5;
  --red: #ff7f88;
  --blue: #73b7ff;
  --shadow-lg: 0 24px 70px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 16px 36px rgba(0, 0, 0, 0.18);
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --font: 'Noto Sans SC', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

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

body {
  font-family: var(--font);
  background:
    radial-gradient(circle at top left, rgba(245, 185, 66, 0.16), transparent 28%),
    radial-gradient(circle at 85% 12%, rgba(115, 183, 255, 0.12), transparent 26%),
    radial-gradient(circle at bottom right, rgba(85, 230, 165, 0.08), transparent 24%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.65;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent 24%);
}

.screen {
  display: none;
  min-height: 100vh;
  padding: 1.75rem;
  max-width: 1120px;
  margin: 0 auto;
}
.screen.active { display: block; }

.section-shell {
  position: relative;
  margin-top: 1.35rem;
  padding: 1.28rem 1.28rem 1.38rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01) 24%, transparent 100%),
    var(--bg-card);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
}

.section-shell::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(255,255,255,0.05), transparent 30%);
}

/* Hero */
.hero {
  padding: 3rem 1.35rem 2rem;
  border: 1px solid var(--border);
  border-radius: 32px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0.015) 30%, transparent),
    rgba(10, 18, 31, 0.72);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(16px);
  position: relative;
  overflow: hidden;
}

.hero::before,
.hero::after {
  content: '';
  position: absolute;
  border-radius: 999px;
  filter: blur(4px);
  pointer-events: none;
}

.hero::before {
  width: 280px;
  height: 280px;
  top: -120px;
  right: -60px;
  background: radial-gradient(circle, rgba(245, 185, 66, 0.26), transparent 62%);
}

.hero::after {
  width: 220px;
  height: 220px;
  left: -90px;
  bottom: -110px;
  background: radial-gradient(circle, rgba(115, 183, 255, 0.18), transparent 65%);
}

.hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 1.2rem;
  align-items: stretch;
}

.hero-copy {
  text-align: left;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  width: fit-content;
  margin-bottom: 1rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(245, 185, 66, 0.22);
  background: rgba(245, 185, 66, 0.09);
  color: var(--accent-strong);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-copy h1,
.hero-copy .subtitle,
.hero-copy .hero-actions {
  margin-left: 0;
}

.hero-signal {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-bottom: 1.5rem;
  font-family: var(--mono);
}

.hero-signal .dot,
.hero-signal .dash {
  display: inline-block;
  background: var(--accent);
  border-radius: 2px;
  animation: pulse 2s ease-in-out infinite;
}

.hero-signal .dot { width: 8px; height: 8px; border-radius: 50%; }
.hero-signal .dash { width: 24px; height: 8px; }

.hero-signal span:nth-child(2) { animation-delay: 0.2s; }
.hero-signal span:nth-child(3) { animation-delay: 0.4s; }
.hero-signal span:nth-child(4) { animation-delay: 0.6s; }
.hero-signal span:nth-child(5) { animation-delay: 0.8s; }
.hero-signal span:nth-child(6) { animation-delay: 1s; }

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1); }
}

.hero h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-soft);
  font-size: 1.02rem;
  margin: 0 0 1.55rem;
  max-width: 680px;
  position: relative;
  z-index: 1;
  line-height: 1.8;
}

.hero-actions { display: flex; gap: 0.75rem; justify-content: flex-start; flex-wrap: wrap; position: relative; z-index: 1; }

.hero-dashboard {
  position: relative;
  padding: 1.1rem;
  border-radius: 26px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.015) 28%, transparent 100%),
    rgba(15, 24, 40, 0.72);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.2);
  overflow: hidden;
}

.hero-dashboard::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(245, 185, 66, 0.12), transparent 42%);
  pointer-events: none;
}

.dashboard-title {
  position: relative;
  z-index: 1;
  color: var(--text-soft);
  font-size: 0.92rem;
  margin-bottom: 0.9rem;
}

.hero-metrics {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  margin-bottom: 0.85rem;
}

.hero-metric {
  padding: 0.8rem 0.7rem;
  border-radius: 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  text-align: left;
}

.hero-metric-value {
  display: block;
  font-family: var(--mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-strong);
}

.hero-metric-label {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.hero-highlights {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.7rem;
}

.hero-highlight {
  padding: 0.85rem 0.95rem;
  border-radius: 18px;
  background: rgba(8, 17, 31, 0.5);
  border: 1px solid rgba(255,255,255,0.05);
}

.hero-highlight strong {
  display: block;
  margin-bottom: 0.22rem;
  font-size: 0.94rem;
}

.hero-highlight p {
  color: var(--text-muted);
  font-size: 0.84rem;
  line-height: 1.6;
}

.sync-panel {
  margin: 1rem auto 0;
  max-width: none;
  padding: 1rem 1rem 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 22px;
  background: rgba(18, 28, 46, 0.7);
  backdrop-filter: blur(10px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18);
  position: relative;
  z-index: 1;
}

.sync-status { display: flex; align-items: center; gap: 0.5rem; justify-content: center; margin-bottom: 0.75rem; }
.sync-dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.sync-dot.offline { background: var(--text-muted); }
.sync-dot.online { background: var(--green); box-shadow: 0 0 14px rgba(74, 222, 128, 0.45); }
.sync-actions { display: flex; gap: 0.65rem; justify-content: center; flex-wrap: wrap; }
.sync-user { text-align: center; color: var(--text-muted); font-size: 0.85rem; margin-top: 0.6rem; }
.sync-msg { min-height: 1.2em; }
.btn-small {
  min-height: 44px;
  padding: 0.68rem 1.2rem;
  font-size: 0.9rem;
}
#language-select {
  min-width: 118px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,0.03);
  color: var(--text);
  min-height: 44px;
  padding-right: 2rem;
}

.panel {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent), var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
}

.profile-card, .profile-section, .plan-header, .stats-overview, .stats-bar, .train-area {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent), var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
}

.profile-card {
  margin-top: 1rem;
  padding: 1.35rem;
}
.profile-card p { margin: 0.45rem 0; }
.profile-section { margin-top: 1.25rem; padding: 1.1rem; }
.profile-logs {
  list-style: none;
  display: grid;
  gap: 0.75rem;
  margin-top: 0.75rem;
  position: relative;
  padding-left: 1rem;
}
.profile-logs::before {
  content: '';
  position: absolute;
  left: 0.38rem;
  top: 0.2rem;
  bottom: 0.2rem;
  width: 2px;
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.7), rgba(96, 165, 250, 0.25));
}
.profile-log {
  position: relative;
  display: grid;
  grid-template-columns: 1.4fr 0.7fr 2.2fr;
  gap: 0.75rem;
  align-items: center;
  padding: 0.85rem 0.95rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent), var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03), 0 10px 22px rgba(0,0,0,0.08);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.profile-log:hover {
  transform: translateY(-2px);
  border-color: rgba(245, 185, 66, 0.18);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03), 0 14px 26px rgba(0,0,0,0.12);
}
.profile-log::before {
  content: '';
  position: absolute;
  left: -1rem;
  top: 1rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 3px rgba(136, 146, 164, 0.08);
}
.profile-log.ok::before { background: var(--green); box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.12); }
.profile-log.error::before { background: var(--red); box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.12); }
.profile-log.ok { border-color: rgba(74, 222, 128, 0.3); }
.profile-log.error { border-color: rgba(248, 113, 113, 0.3); }
.profile-log.empty {
  grid-template-columns: 1fr;
  color: var(--text-muted);
  text-align: center;
  padding-left: 0.95rem;
  min-height: 3.2rem;
}
.profile-log.empty::before {
  display: none;
}
.profile-log.empty::after {
  content: '';
  display: block;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
}
.log-time, .log-type { color: var(--text-muted); font-size: 0.82rem; font-family: var(--mono); }
.log-type {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  background: rgba(245, 158, 11, 0.08);
  color: var(--accent);
  width: fit-content;
}
.log-message { color: var(--text); }

.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal.hidden { display: none; }
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
}
.modal-card {
  position: relative;
  width: min(92vw, 420px);
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.015) 30%, transparent), var(--bg-card-strong);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 24px;
  padding: 1.25rem;
  box-shadow: 0 24px 70px rgba(0,0,0,0.46);
  backdrop-filter: blur(18px);
}
.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; }
.modal-header h3 {
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}
.modal-close {
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
  color: var(--text-soft);
  font-size: 1.15rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.modal-close:hover {
  color: var(--text);
  border-color: rgba(245, 185, 66, 0.35);
  background: rgba(245, 185, 66, 0.08);
}
.auth-form { display: grid; gap: 0.85rem; }
.auth-form label { display: grid; gap: 0.45rem; color: var(--text-muted); font-size: 0.9rem; }
.auth-form input {
  width: 100%;
  min-height: 50px;
  padding: 0.9rem 1rem;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent), rgba(16, 26, 42, 0.96);
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.auth-form input:focus {
  outline: none;
  border-color: rgba(245, 185, 66, 0.45);
  box-shadow: 0 0 0 3px rgba(245, 185, 66, 0.1);
}

/* Buttons */
.btn,
.btn-primary,
.btn-ghost,
.btn-play,
.btn-danger,
.btn-back,
.btn-step-start,
.btn-small,
.option-btn,
.mode-btn,
.profile-actions .btn {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.2s ease, filter 0.2s ease, border-color 0.2s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  min-height: 48px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  letter-spacing: 0.01em;
}

.btn,
.btn-primary,
.btn-ghost,
.btn-play,
.btn-danger,
.btn-step-start,
.btn-small {
  padding: 0.72rem 1.4rem;
}

.btn-primary {
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.01)), var(--accent);
  color: #1d1300;
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 10px 22px rgba(245, 185, 66, 0.18);
}
.btn-primary:hover { filter: brightness(1.03); transform: translateY(-1px); box-shadow: 0 14px 26px rgba(245, 185, 66, 0.22); }

.btn-ghost {
  background: rgba(255,255,255,0.03);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.025);
}
.btn-ghost:hover { border-color: rgba(245, 185, 66, 0.45); color: var(--accent-strong); background: rgba(245, 185, 66, 0.08); box-shadow: 0 10px 22px rgba(0,0,0,0.12); }

.btn-play {
  background: linear-gradient(180deg, rgba(255,255,255,0.05), transparent), var(--bg-elevated);
  color: var(--accent-strong);
  border: 1px solid var(--border);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
}
.btn-play:hover { border-color: rgba(245, 158, 11, 0.75); box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.08), 0 10px 20px rgba(0,0,0,0.14); }
.btn-play.playing { animation: glow 0.8s ease-in-out infinite alternate; }
.btn-play-lg { font-size: 1.05rem; padding: 0.95rem 2rem; }

.btn-danger {
  background: rgba(248, 113, 113, 0.04);
  color: var(--red);
  border: 1px solid rgba(248, 113, 113, 0.45);
}
.btn-danger:hover { background: rgba(248, 113, 113, 0.12); }

.btn-back {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  color: var(--text-soft);
  padding: 0.7rem 1rem;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.025);
}
.btn-back:hover {
  color: var(--text);
  border-color: rgba(245, 185, 66, 0.35);
  background: rgba(245, 185, 66, 0.08);
  box-shadow: 0 10px 22px rgba(0,0,0,0.12);
}

@keyframes glow {
  from { box-shadow: 0 0 5px var(--accent-glow); }
  to { box-shadow: 0 0 25px var(--accent-glow); }
}

/* Level grid */
.levels-section { padding: 0.35rem 0 1.2rem; }
.levels-section h2 { font-size: 1.2rem; color: var(--text-soft); margin-bottom: 1rem; }
.section-focus { animation: sectionPulse 1.4s ease; }

.section-heading {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.section-eyebrow {
  color: var(--accent-strong);
  font-size: 0.73rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-heading h2 {
  margin-bottom: 0;
}

@keyframes sectionPulse {
  0% { transform: scale(1); }
  20% { transform: scale(1.01); }
  100% { transform: scale(1); }
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.level-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), transparent), var(--bg-card-strong);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 1.35rem;
  cursor: pointer;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.14);
}

.level-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent, #f59e0b);
}

.level-card:hover:not(.locked) {
  border-color: var(--accent, #f59e0b);
  transform: translateY(-4px);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.3);
}

.level-card.locked {
  opacity: 0.55;
  cursor: not-allowed;
}

.level-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.level-card h3 { font-size: 1.15rem; margin-bottom: 0.35rem; }
.level-desc { color: var(--text-soft); font-size: 0.88rem; margin-bottom: 0.9rem; }
.level-meta { display: flex; gap: 0.75rem; font-size: 0.8rem; font-family: var(--mono); color: var(--accent-strong); }
.lock-badge { margin-top: 0.9rem; font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; }

/* Level detail */
.top-bar { margin-bottom: 1.5rem; }
.page-header,
.level-header {
  margin-bottom: 1.4rem;
  padding: 1.15rem 1.2rem;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.015) 34%, transparent),
    rgba(14, 23, 39, 0.84);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
}

.page-header::before,
.level-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.04), transparent 45%);
  pointer-events: none;
}

.page-header h2,
.level-header h2,
.page-header p,
.level-header p {
  position: relative;
  z-index: 1;
}

.page-header h2,
.level-header h2 { font-size: 1.6rem; margin-bottom: 0.2rem; }
.level-header p,
.page-header p { color: var(--text-muted); }

.mode-list { display: flex; flex-direction: column; gap: 0.75rem; }

.mode-btn {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent), var(--bg-card-strong);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  text-align: left;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
}
.mode-btn strong { font-size: 1rem; }
.mode-btn span { font-size: 0.85rem; color: var(--text-soft); }
.mode-btn:hover { border-color: rgba(245, 185, 66, 0.65); background: var(--bg-elevated); transform: translateY(-2px); }

/* Training */
.train-bar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; }
.train-badges { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.badge {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent), rgba(18, 28, 46, 0.92);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-soft);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.025);
}
.badge-wpm { font-family: var(--mono); color: var(--accent); }

.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.1rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent), var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 0.85rem;
  border: 1px solid var(--border);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
  position: relative;
  overflow: hidden;
}

.stats-bar::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.04), transparent 45%);
  pointer-events: none;
}

.stat-item {
  text-align: center;
  padding: 0.85rem 0.5rem;
  border-radius: 14px;
  background: rgba(255,255,255,0.025);
  border: 1px solid rgba(255,255,255,0.03);
  position: relative;
  z-index: 1;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.stat-item:hover {
  transform: translateY(-2px);
  border-color: rgba(245, 185, 66, 0.16);
  box-shadow: 0 12px 20px rgba(0,0,0,0.1);
}
.stat-label { display: block; font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.stat-value { font-family: var(--mono); font-size: 1.35rem; font-weight: 700; color: var(--accent-strong); }

.endurance-bar {
  position: relative;
  background: var(--bg-elevated);
  border-radius: var(--radius);
  padding: 0.6rem 1rem;
  margin-bottom: 1rem;
  overflow: hidden;
  text-align: center;
  font-size: 0.9rem;
}
.endurance-fill {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  background: linear-gradient(90deg, var(--accent-glow), transparent);
  transition: width 1s linear;
  pointer-events: none;
}

.train-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 2.2rem 1.15rem;
  min-height: 50vh;
  position: relative;
  overflow: hidden;
}

.train-area::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top center, rgba(245, 185, 66, 0.08), transparent 28%),
    linear-gradient(135deg, rgba(255,255,255,0.03), transparent 36%);
  pointer-events: none;
}

#screen-train.active .train-area::after {
  content: '';
  position: absolute;
  inset: 12% 18%;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(245, 185, 66, 0.08), transparent 62%);
  filter: blur(18px);
  pointer-events: none;
  animation: trainingPulse 2.8s ease-in-out infinite;
}

.morse-display {
  font-family: var(--mono);
  font-size: 2.15rem;
  letter-spacing: 0.3em;
  color: var(--accent-strong);
  text-align: center;
  min-height: 3rem;
  position: relative;
  z-index: 1;
  text-shadow: 0 0 24px rgba(245, 185, 66, 0.18);
  animation: signalBreath 2.4s ease-in-out infinite;
}

/* Flashcard */
.flashcard {
  text-align: center;
  width: min(100%, 560px);
  padding: 1.4rem 1rem;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.015) 34%, transparent), rgba(14, 23, 39, 0.84);
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 1;
}
.flash-letter {
  font-family: var(--mono);
  font-size: 5rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.flash-morse {
  font-family: var(--mono);
  font-size: 2.5rem;
  color: var(--accent);
  letter-spacing: 0.2em;
  margin-bottom: 0.5rem;
}
.flash-hint { color: var(--text-muted); margin-bottom: 1.5rem; }
.flash-actions { display: flex; gap: 0.75rem; justify-content: center; }

/* Options */
.options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  width: 100%;
  max-width: 400px;
}

.option-btn {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 600;
  min-height: 88px;
  padding: 1.15rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent), var(--bg-card-strong);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text);
  box-shadow: var(--shadow-md);
}
.option-btn:hover:not(:disabled) {
  border-color: rgba(245, 158, 11, 0.5);
  background: rgba(21, 32, 52, 0.96);
  transform: translateY(-2px);
  box-shadow: 0 16px 28px rgba(0,0,0,0.18);
}
.option-btn:disabled { opacity: 0.5; cursor: default; }

/* Input */
.input-area { width: 100%; max-width: 480px; }
.input-area input {
  width: 100%;
  font-family: var(--mono);
  font-size: 1.3rem;
  min-height: 56px;
  padding: 0.95rem 1.2rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent), var(--bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  color: var(--text);
  text-align: center;
  letter-spacing: 0.15em;
  outline: none;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.025);
}
.input-area input:focus {
  border-color: rgba(245, 158, 11, 0.48);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.12), 0 12px 24px rgba(0,0,0,0.14);
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent), rgba(18, 28, 46, 0.96);
}
.input-area input::placeholder { letter-spacing: normal; font-size: 0.9rem; }

/* Feedback */
.feedback {
  padding: 0.8rem 1.25rem;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  text-align: center;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.10);
}
.feedback.correct { background: rgba(74, 222, 128, 0.12); color: var(--green); border: 1px solid rgba(74, 222, 128, 0.3); }
.feedback.wrong { background: rgba(248, 113, 113, 0.12); color: var(--red); border: 1px solid rgba(248, 113, 113, 0.3); }

@keyframes trainingPulse {
  0%, 100% { opacity: 0.35; transform: scale(0.96); }
  50% { opacity: 0.78; transform: scale(1.02); }
}

@keyframes signalBreath {
  0%, 100% { opacity: 0.82; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-2px); }
}

.hidden { display: none !important; }

/* Stats page */
.stats-overview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1.05rem;
  margin: 1.6rem 0 2rem;
  padding: 1.05rem;
}

.stat-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent), var(--bg-card-strong);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.25rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  box-shadow: 0 14px 30px rgba(0,0,0,0.14);
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.04), transparent 45%);
  pointer-events: none;
}
.stat-card .big {
  position: relative;
  z-index: 1;
  font-family: var(--mono);
  font-size: 1.95rem;
  font-weight: 700;
  color: var(--accent-strong);
}
.stat-card span:last-child {
  position: relative;
  z-index: 1;
  font-size: 0.82rem;
  color: var(--text-soft);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.level-breakdown { display: flex; flex-direction: column; gap: 0.5rem; }
.stat-row {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.9rem 1rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent), var(--bg-card-strong);
  border-radius: 16px;
  border: 1px solid var(--border);
  font-size: 0.9rem;
  box-shadow: 0 10px 22px rgba(0,0,0,0.1);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.stat-row:hover {
  transform: translateY(-2px);
  border-color: rgba(245, 185, 66, 0.22);
  box-shadow: 0 14px 26px rgba(0,0,0,0.14);
}
.stat-row span:first-child {
  color: var(--text);
  font-weight: 600;
}
.stat-row span:last-child {
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}
.section-desc {
  color: var(--text-muted);
  margin: 0.35rem 0 0.85rem;
  line-height: 1.7;
}
.profile-card h3 {
  margin-bottom: 0.8rem;
  font-size: 1.02rem;
}

#leaderboard-list .stat-row,
#leaderboard-history .stat-row {
  align-items: center;
  min-height: 64px;
}

#leaderboard-list .stat-row span:first-child,
#leaderboard-history .stat-row span:first-child {
  font-size: 0.95rem;
}

#my-rank-summary {
  padding: 0.85rem 1rem;
  border-radius: 16px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
}

#leaderboard-list .stat-row {
  position: relative;
  overflow: hidden;
}

#leaderboard-list .stat-row::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: rgba(255,255,255,0.08);
}

#leaderboard-list .stat-row:nth-child(1) {
  background:
    linear-gradient(90deg, rgba(245, 185, 66, 0.14), transparent 38%),
    linear-gradient(180deg, rgba(255,255,255,0.04), transparent),
    var(--bg-card-strong);
  border-color: rgba(245, 185, 66, 0.34);
  box-shadow: 0 16px 32px rgba(245, 185, 66, 0.12);
}

#leaderboard-list .stat-row:nth-child(1)::before {
  background: linear-gradient(180deg, #ffd66b, #f5b942);
}

#leaderboard-list .stat-row:nth-child(2) {
  background:
    linear-gradient(90deg, rgba(160, 174, 192, 0.14), transparent 38%),
    linear-gradient(180deg, rgba(255,255,255,0.04), transparent),
    var(--bg-card-strong);
  border-color: rgba(166, 180, 206, 0.28);
}

#leaderboard-list .stat-row:nth-child(2)::before {
  background: linear-gradient(180deg, #d8dee9, #94a3b8);
}

#leaderboard-list .stat-row:nth-child(3) {
  background:
    linear-gradient(90deg, rgba(194, 120, 59, 0.14), transparent 38%),
    linear-gradient(180deg, rgba(255,255,255,0.04), transparent),
    var(--bg-card-strong);
  border-color: rgba(194, 120, 59, 0.3);
}

#leaderboard-list .stat-row:nth-child(3)::before {
  background: linear-gradient(180deg, #e0a46e, #b86b35);
}

/* Study Plan */
.plan-header {
  margin-bottom: 2rem;
  padding: 1.35rem;
}

.plan-header h2 { font-size: 1.6rem; margin-bottom: 0.5rem; }
.plan-summary { color: var(--text-muted); margin-bottom: 1.25rem; }

.plan-progress-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.plan-progress-bar {
  flex: 1;
  height: 8px;
  background: var(--bg-elevated);
  border-radius: 999px;
  overflow: hidden;
}

.plan-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #fbbf24);
  border-radius: 999px;
  transition: width 0.4s ease;
  width: 0;
}

.plan-progress-text {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent-strong);
  white-space: nowrap;
}

.btn-continue { width: 100%; max-width: 480px; }

.plan-section {
  margin-bottom: 2.35rem;
}

.compact-section {
  margin-bottom: 1.75rem;
}

.plan-section h3 {
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
  color: var(--text);
}

.section-desc {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 1rem;
}

.daily-routine {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.routine-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent), var(--bg-card-strong);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.05rem 1rem;
  box-shadow: 0 10px 24px rgba(0,0,0,0.1);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
  position: relative;
  overflow: hidden;
}

.routine-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.04), transparent 42%);
  pointer-events: none;
}

.routine-card:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 185, 66, 0.28);
  box-shadow: 0 18px 34px rgba(0,0,0,0.2);
  background: linear-gradient(180deg, rgba(255,255,255,0.05), transparent), rgba(21, 32, 52, 0.96);
}

.routine-time {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  margin-bottom: 0.5rem;
}

.routine-card strong,
.routine-card p,
.routine-card a {
  position: relative;
  z-index: 1;
}

.routine-card strong { display: block; margin-bottom: 0.32rem; font-size: 0.98rem; line-height: 1.45; }
.routine-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.72; }
.routine-card a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.18s ease;
}

.routine-card a:hover {
  color: var(--accent-strong);
}

.section-action {
  display: flex;
  justify-content: flex-start;
  margin-top: 0.9rem;
}

.section-action .btn {
  min-width: 180px;
}

.koch-timeline {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.5rem;
}

.koch-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  opacity: 0.5;
  transition: all 0.2s;
}

.koch-item.done { opacity: 1; }
.koch-item.current {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-glow);
}

.koch-day {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--mono);
}

.koch-letters {
  display: block;
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0.15rem 0;
}

.koch-tip {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.phase-roadmap {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.phase-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent), var(--bg-card-strong);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.25rem;
  border-left: 3px solid var(--phase-color, var(--accent));
  box-shadow: var(--shadow-md);
}

.phase-card.locked { opacity: 0.45; }
.phase-card.completed { border-left-color: var(--green); }

.phase-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.phase-week {
  font-size: 0.78rem;
  color: var(--phase-color, var(--accent));
  font-family: var(--mono);
}

.phase-head h4 { font-size: 1.05rem; margin: 0.2rem 0; }
.phase-goal { font-size: 0.85rem; color: var(--text-muted); }

.phase-badge {
  font-family: var(--mono);
  font-size: 0.9rem;
  background: var(--bg-elevated);
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  color: var(--accent);
  flex-shrink: 0;
}

.phase-steps { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 0.75rem; }

.step-item {
  display: flex;
  gap: 0.75rem;
  padding: 0.9rem;
  background: rgba(255,255,255,0.03);
  border-radius: 14px;
  border: 1px solid transparent;
}

.step-item.done { border-color: rgba(74, 222, 128, 0.25); }

.step-status {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
  color: var(--text-muted);
}

.step-item.done .step-status {
  background: rgba(74, 222, 128, 0.15);
  color: var(--green);
}

.step-body { flex: 1; min-width: 0; }
.step-body strong { display: block; font-size: 0.95rem; }
.step-mode { font-size: 0.78rem; color: var(--text-muted); }
.step-body p { font-size: 0.85rem; color: var(--text-muted); margin: 0.35rem 0; }

.step-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.78rem;
  font-family: var(--mono);
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.btn-step-start {
  font-family: var(--font);
  font-size: 0.82rem;
  padding: 0.35rem 0.85rem;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-step-start:hover {
  background: var(--accent-glow);
}

.phase-tips {
  list-style: none;
  padding: 0;
  margin: 0;
}

.phase-tips li {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 0.25rem 0 0.25rem 1rem;
  position: relative;
}

.phase-tips li::before {
  content: '*';
  position: absolute;
  left: 0;
  font-size: 0.75rem;
  color: var(--accent);
}

.plan-principles {
  list-style: none;
  padding: 0;
}

.plan-principles li {
  padding: 0.75rem 1rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), transparent), var(--bg-card-strong);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.plan-principles li::before {
  content: '->';
  color: var(--accent);
}

.footer {
  text-align: center;
  padding: 1.6rem 0 2.1rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-top: 1.5rem;
}
.footer a {
  color: var(--text-soft);
  text-decoration: none;
}
.footer a:hover {
  color: var(--accent-strong);
}
.footer p + p {
  margin-top: 0.35rem;
}
.footer kbd {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-family: var(--mono);
  font-size: 0.78rem;
}

@media (max-width: 900px) {
  .screen { padding: 1.25rem; }
  .section-shell { padding: 1rem; }
  .hero-layout { grid-template-columns: 1fr; }
  .hero-dashboard { max-width: 100%; }
  .level-grid,
  .daily-routine,
  .koch-timeline { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats-overview { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .profile-log {
    grid-template-columns: 1fr;
    gap: 0.35rem;
    align-items: start;
  }
  .profile-log::before { top: 0.95rem; }
}

@media (max-width: 600px) {
  .screen { padding: 1rem; }
  .hero { padding: 2.2rem 0.8rem 1.25rem; border-radius: 24px; }
  .section-shell { border-radius: 22px; padding: 0.95rem; }
  .page-header,
  .level-header,
  .plan-header,
  .profile-card,
  .profile-section {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  .hero-copy { text-align: center; }
  .hero-eyebrow { margin-left: auto; margin-right: auto; }
  .hero-actions,
  .sync-actions,
  .profile-actions {
    gap: 0.5rem;
  }
  .hero-actions .btn,
  .sync-actions .btn,
  .profile-actions .btn {
    flex: 1 1 calc(50% - 0.25rem);
  }
  .hero-metrics { grid-template-columns: 1fr; }
  .hero-actions { justify-content: center; }
  .sync-panel,
  .profile-card,
  .profile-section,
  .stats-bar,
  .level-card,
  .mode-btn,
  .routine-card,
  .plan-principles li,
  .feedback,
  .flashcard,
  .endurance-bar,
  .modal-card {
    border-radius: 16px;
  }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .stats-overview { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .options-grid { grid-template-columns: 1fr 1fr; }
  .flash-letter { font-size: 3.3rem; }
  .flash-morse { font-size: 2rem; }
  .morse-display { font-size: 1.6rem; letter-spacing: 0.22em; }
  .input-area input { font-size: 1.1rem; }
  .plan-progress-wrap { flex-direction: column; align-items: stretch; }
  .koch-timeline { grid-template-columns: 1fr 1fr; }
  .step-item { flex-direction: column; }
  .step-status { width: 22px; height: 22px; }
  .step-meta { gap: 0.35rem; }
  .profile-log,
  .profile-log.empty {
    grid-template-columns: 1fr;
    padding-left: 0.85rem;
  }
  .profile-logs::before { left: 0.34rem; }
  .profile-log::before { left: -0.92rem; }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 1.7rem; }
  .subtitle { font-size: 0.96rem; }
  .screen h2 { font-size: 1.35rem; }
  .screen h3 { font-size: 1rem; }
  .btn { width: 100%; justify-content: center; }
  .hero-actions,
  .sync-actions,
  .profile-actions,
  .flash-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .options-grid { grid-template-columns: 1fr; }
  .koch-timeline { grid-template-columns: 1fr; }
  .train-badges { width: 100%; }
  .train-badges .badge { flex: 1; text-align: center; }
}

/* Final visual polish */
.hero h1,
.screen h2,
.screen h3,
.level-header h2,
.plan-header h2 {
  letter-spacing: -0.03em;
}

.screen h2 {
  font-size: clamp(1.45rem, 2.3vw, 1.85rem);
  margin-bottom: 1.05rem;
  line-height: 1.2;
}

.screen h3 {
  font-size: 1.05rem;
  margin-bottom: 0.85rem;
  line-height: 1.35;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.screen > .hero,
.screen > .level-header,
.screen > .plan-header,
.screen > .stats-overview,
.screen > .top-bar,
.screen > .profile-card,
.screen > .profile-section {
  animation: fadeInUp 0.38s ease both;
}

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


.hero-topbar {
  justify-content: flex-end;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}