/* LPL — Language Practice Line — Styles */
/* Clean, mobile-first, voice-first */

:root {
  --bg: #0b0f19;
  --surface: #141b2d;
  --surface2: #1c2541;
  --border: #2a3a5c;
  --text: #e8edf5;
  --text-muted: #8899bb;
  --accent: #4f9cf7;
  --accent-hover: #6bb0ff;
  --green: #34d399;
  --green-bg: #064e3b;
  --red: #f87171;
  --red-bg: #7f1d1d;
  --yellow: #fbbf24;
  --yellow-bg: #78350f;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---- SCREENS ---- */
.screen { display: none; flex-direction: column; min-height: 100dvh; }
.screen.active { display: flex; }

/* ---- AUTH ---- */
.auth-container {
  max-width: 400px; margin: auto; padding: 32px 24px;
  display: flex; flex-direction: column; gap: 24px; width: 100%;
}
.auth-header { text-align: center; }
.logo {
  font-size: 48px; font-weight: 800; letter-spacing: 4px;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.subtitle { font-size: 14px; color: var(--text-muted); letter-spacing: 6px; text-transform: uppercase; margin-top: 4px; }
.description { font-size: 14px; color: var(--text-muted); margin-top: 8px; }

#auth-form {
  display: flex; flex-direction: column; gap: 16px;
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 13px; color: var(--text-muted); font-weight: 500; }
.field input {
  padding: 12px 14px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 15px;
  outline: none; transition: border .2s;
}
.field input:focus { border-color: var(--accent); }

/* Code digit inputs */
.code-message { font-size: 14px; color: var(--text-muted); text-align: center; }
.code-inputs {
  display: flex; justify-content: center; gap: 8px;
}
.code-digit {
  width: 46px; height: 56px; text-align: center; font-size: 24px; font-weight: 700;
  background: var(--surface); border: 2px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  outline: none; transition: border .2s;
}
.code-digit:focus { border-color: var(--accent); }
.code-digit.filled { border-color: var(--accent); }

.resend-btn {
  background: none; border: none; color: var(--text-muted); font-size: 13px;
  cursor: pointer; padding: 8px; align-self: center;
}
.resend-btn:disabled { opacity: .4; cursor: not-allowed; }
.resend-btn:not(:disabled):hover { color: var(--accent); }

.btn-primary {
  padding: 14px; background: var(--accent); color: #fff; border: none;
  border-radius: var(--radius); font-size: 16px; font-weight: 600;
  cursor: pointer; transition: background .2s;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }

.error-msg { color: var(--red); font-size: 13px; text-align: center; }
.hidden { display: none !important; }

.auth-footer { text-align: center; font-size: 13px; color: var(--text-muted); }

/* ---- DASHBOARD ---- */
.dash-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.logo-sm { font-size: 24px; font-weight: 800; letter-spacing: 3px; color: var(--accent); }
.header-right { display: flex; align-items: center; gap: 16px; }
.user-name { font-size: 14px; color: var(--text-muted); }
.btn-text { background: none; border: none; color: var(--text-muted); font-size: 13px; cursor: pointer; }
.btn-text:hover { color: var(--text); }

.dash-main { max-width: 520px; margin: 0 auto; padding: 24px 20px; display: flex; flex-direction: column; gap: 20px; width: 100%; }

.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stat-card {
  background: var(--surface); border-radius: var(--radius); padding: 16px 12px;
  text-align: center; display: flex; flex-direction: column; gap: 4px;
}
.stat-value { font-size: 24px; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; }

.session-card {
  background: var(--surface); border-radius: var(--radius); padding: 24px;
  display: flex; flex-direction: column; gap: 16px; text-align: center;
}
.session-card h2 { font-size: 20px; font-weight: 600; }
.card-desc { color: var(--text-muted); font-size: 14px; }

.facilitator-select { text-align: left; }
.facilitator-select label { font-size: 13px; color: var(--text-muted); font-weight: 500; display: block; margin-bottom: 10px; }

.facilitator-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.facilitator-card {
  padding: 16px 12px; background: var(--surface); border: 2px solid var(--border);
  border-radius: var(--radius); cursor: pointer; text-align: center;
  transition: all .2s;
}
.facilitator-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(79, 156, 247, 0.12);
}
.facilitator-card.selected {
  border-color: var(--accent);
  background: rgba(79, 156, 247, 0.08);
  box-shadow: 0 0 20px rgba(79, 156, 247, 0.15);
}
.facilitator-emoji { font-size: 36px; margin-bottom: 6px; line-height: 1.2; }
.facilitator-name { font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.facilitator-accent { font-size: 11px; color: var(--text-muted); margin-bottom: 4px; }
.facilitator-style { font-size: 11px; color: var(--accent); line-height: 1.3; }

.btn-lg { padding: 18px; font-size: 18px; }
.btn-icon { margin-right: 8px; }

.history-details { background: var(--surface); border-radius: var(--radius); padding: 16px 20px; }
.history-details summary { cursor: pointer; font-weight: 600; font-size: 14px; color: var(--text-muted); }
.history-list { margin-top: 12px; display: flex; flex-direction: column; gap: 8px; }
.history-item { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 13px; }
.history-item:last-child { border-bottom: none; }
.history-item .hi-date { color: var(--text-muted); }
.history-item .hi-score { color: var(--green); font-weight: 600; }
.empty-msg { color: var(--text-muted); font-size: 13px; text-align: center; }

/* ---- CALL SCREEN ---- */
.call-top {
  text-align: center; padding: 20px 20px 8px;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.call-timer-row { display: flex; align-items: center; gap: 8px; font-size: 32px; font-weight: 200; letter-spacing: 1px; }
.call-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--green); animation: pulse 1.5s infinite; }
.call-dot.idle { background: var(--text-muted); animation: none; }
.call-dot.error { background: var(--red); animation: none; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .4; } }
.call-limit { font-size: 14px; color: var(--text-muted); }
.call-phase { font-size: 13px; color: var(--text-muted); }

.call-center {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 16px; padding: 16px 20px; max-width: 520px;
  margin: 0 auto; width: 100%; overflow-y: auto;
}

.status-badge {
  padding: 10px 20px; border-radius: 20px; font-size: 14px; font-weight: 500;
  background: var(--surface2); color: var(--text-muted); text-align: center;
  transition: all .3s;
}
.status-badge.connected { background: var(--green-bg); color: var(--green); }
.status-badge.speaking { background: var(--surface2); color: var(--accent); }
.status-badge.listening { background: var(--surface2); color: var(--green); }
.status-badge.error { background: var(--red-bg); color: var(--red); }

.correction-area {
  background: var(--yellow-bg); border-radius: var(--radius); padding: 14px 18px;
  width: 100%; text-align: center;
}
.correction-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--yellow); }
#correction-content { font-size: 14px; margin-top: 4px; color: var(--text); }

.transcript-area {
  width: 100%; max-height: 200px; overflow-y: auto; display: flex;
  flex-direction: column; gap: 8px;
}
#transcript-messages { display: flex; flex-direction: column; gap: 8px; }
.transcript-msg {
  padding: 10px 14px; border-radius: var(--radius-sm); font-size: 13px;
  line-height: 1.4; max-width: 85%;
}
.transcript-msg.jake { background: var(--surface2); align-self: flex-start; color: var(--text); }
.transcript-msg.you { background: var(--surface); align-self: flex-end; color: var(--text-muted); }

.call-bottom {
  display: flex; flex-direction: column; align-items: center; gap: 20px;
  padding: 16px 20px 32px; border-top: 1px solid var(--border);
}

/* Audio visualization */
.audio-viz-container {
  width: 100%; text-align: center; margin-bottom: 6px;
}
.viz-label {
  font-size: 10px; color: var(--text-muted); text-transform: uppercase;
  letter-spacing: 1px; margin-bottom: 4px;
}
.audio-canvas {
  width: 100%; max-width: 280px; height: 48px;
  background: var(--surface); border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.mic-indicator { opacity: .5; transition: opacity .3s; }
.mic-indicator.active { opacity: 1; }
.mic-bars { display: flex; align-items: flex-end; gap: 3px; height: 20px; }
.mic-bars span {
  width: 4px; background: var(--accent); border-radius: 2px;
  transition: height .1s; height: 4px;
}

.btn-hangup {
  width: 64px; height: 64px; border-radius: 50%; border: none;
  background: var(--red); color: #fff; font-size: 24px;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(248,113,113,.3);
  transition: transform .2s;
}
.btn-hangup:hover { transform: scale(1.05); }
.hangup-icon { line-height: 1; }

/* ---- END SCREEN ---- */
.end-card {
  max-width: 400px; margin: auto; padding: 40px 24px; text-align: center;
  display: flex; flex-direction: column; gap: 20px; align-items: center; width: 100%;
}
.end-icon { font-size: 48px; }
.end-card h2 { font-size: 24px; font-weight: 700; }
.end-stats { display: flex; gap: 32px; }
.end-stat { display: flex; flex-direction: column; gap: 4px; }
.end-stat-value { font-size: 20px; font-weight: 600; color: var(--accent); }
.end-stat-label { font-size: 12px; color: var(--text-muted); }
.end-message { color: var(--text-muted); font-size: 14px; }

/* ---- PLANS SCREEN ---- */
.plans-container {
  max-width: 500px; margin: auto; padding: 32px 20px; text-align: center; width: 100%;
}
.plans-container h2 { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.plans-subtitle { color: var(--text-muted); font-size: 14px; margin-bottom: 24px; }
.plans-grid {
  display: flex; flex-direction: column; gap: 12px; margin-bottom: 16px;
}
.plan-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  display: flex; align-items: center; gap: 16px;
  text-align: left; transition: border-color .2s, box-shadow .2s;
}
.plan-card:hover { border-color: var(--accent); box-shadow: 0 0 16px rgba(79,156,247,.1); }
.plan-emoji { font-size: 32px; flex-shrink: 0; width: 44px; text-align: center; }
.plan-info { flex: 1; }
.plan-name { font-size: 16px; font-weight: 600; }
.plan-sessions { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.plan-price { font-size: 20px; font-weight: 700; color: var(--accent); white-space: nowrap; }
.plan-buy-btn {
  padding: 10px 20px; border-radius: 8px; font-size: 13px; white-space: nowrap;
}
.plans-single { margin-top: 8px; }
.single-class-card { border: 1px dashed var(--border); }
.single-class-card .plan-price { color: var(--green); }

/* ---- RESPONSIVE ---- */

/* ── Safe area insets (iPhone X+, notched devices) ── */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  body {
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }
  .call-bottom {
    padding-bottom: calc(16px + env(safe-area-inset-bottom));
  }
  .auth-container,
  .dash-main,
  .plans-container,
  .end-card {
    padding-bottom: calc(32px + env(safe-area-inset-bottom));
  }
}

/* ── Landscape phones: auth siempre visible sin scroll ── */
@media (max-height: 500px) and (orientation: landscape) {
  .auth-container {
    gap: 12px; padding: 16px 20px;
  }
  .logo { font-size: 32px; }
  .subtitle { font-size: 11px; letter-spacing: 3px; }
  .description { font-size: 12px; margin-top: 2px; }
  .auth-footer { display: none; }
  #auth-form { gap: 10px; }
  .field input { padding: 8px 12px; font-size: 14px; }
  .code-digit { width: 38px; height: 46px; font-size: 20px; }
  .btn-primary { padding: 10px; font-size: 14px; }

  .call-center { gap: 8px; padding: 8px 16px; }
  .call-timer-row { font-size: 22px; }
  .transcript-area { max-height: 80px; }
  .audio-canvas { height: 36px; }
  .btn-hangup { width: 48px; height: 48px; font-size: 20px; }

  .end-card { gap: 12px; padding: 24px 20px; }
  .end-icon { font-size: 32px; }
  .end-card h2 { font-size: 20px; }

  .dash-main { gap: 12px; padding: 16px; }
  .stats-row { gap: 8px; }
  .stat-card { padding: 10px 8px; }
  .stat-value { font-size: 18px; }
  .facilitator-grid { grid-template-columns: repeat(4, 1fr); gap: 8px; }
  .facilitator-card { padding: 10px 8px; }
  .facilitator-emoji { font-size: 24px; }
  .facilitator-name { font-size: 11px; }
  .facilitator-accent, .facilitator-style { font-size: 10px; }
}

/* ── Phones < 380px (iPhone SE, small Androids) ── */
@media (max-width: 380px) {
  .auth-container { padding: 24px 16px; gap: 18px; }
  .logo { font-size: 40px; }
  .code-digit { width: 40px; height: 48px; font-size: 20px; }
  .code-inputs { gap: 6px; }

  .dash-main { padding: 16px 12px; gap: 14px; }
  .stats-row { gap: 6px; }
  .stat-card { padding: 10px 6px; }
  .stat-value { font-size: 18px; }
  .stat-label { font-size: 10px; }
  .facilitator-grid { grid-template-columns: 1fr; gap: 8px; }
  .session-card { padding: 16px; }
  .session-card h2 { font-size: 18px; }

  .call-timer-row { font-size: 24px; }
  .call-center { padding: 12px 14px; gap: 12px; }
  .transcript-area { max-height: 150px; }
  .btn-hangup { width: 56px; height: 56px; }
  .audio-canvas { max-width: 100%; height: 40px; }

  .plan-card { padding: 12px; gap: 8px; flex-wrap: wrap; }
  .plan-emoji { font-size: 24px; width: 28px; }
  .plan-name { font-size: 14px; }
  .plan-price { font-size: 16px; }
  .plan-buy-btn { padding: 8px 14px; font-size: 12px; }

  .end-card { padding: 32px 16px; }
  .end-card h2 { font-size: 20px; }
  .end-stats { gap: 20px; }
}

/* ── Phones 380px–480px (most modern phones) ── */
@media (min-width: 381px) and (max-width: 480px) {
  .facilitator-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .stats-row { gap: 8px; }
  .stat-card { padding: 12px 8px; }
  .stat-value { font-size: 20px; }
  .call-timer-row { font-size: 28px; }
  .plan-card { padding: 14px; gap: 10px; }
  .plan-emoji { font-size: 24px; width: 32px; }
  .plan-price { font-size: 16px; }
}

/* ── Tablets 481px–768px ── */
@media (min-width: 481px) and (max-width: 768px) {
  .auth-container { max-width: 440px; }
  .dash-main { max-width: 600px; }
  .facilitator-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .stats-row { gap: 16px; }
  .stat-card { padding: 20px 16px; }
  .stat-value { font-size: 28px; }
  .plans-container { max-width: 600px; }
  .plans-grid { flex-direction: row; flex-wrap: wrap; }
  .plan-card { flex: 1 1 calc(50% - 8px); min-width: 220px; }
  .call-center { max-width: 600px; }
  .transcript-area { max-height: 250px; }
}

/* ── Desktop 769px–1024px ── */
@media (min-width: 769px) and (max-width: 1024px) {
  .auth-container { max-width: 440px; }
  .dash-main { max-width: 700px; }
  .facilitator-grid { grid-template-columns: repeat(4, 1fr); gap: 14px; }
  .stats-row { gap: 20px; }
  .plans-container { max-width: 700px; }
  .plans-grid { flex-direction: row; flex-wrap: wrap; gap: 16px; }
  .plan-card { flex: 1 1 calc(33.33% - 12px); min-width: 200px; }
  .call-center { max-width: 700px; }
  .transcript-area { max-height: 280px; }
  .audio-canvas { max-width: 360px; }
}

/* ── Large Desktop 1025px+ ── */
@media (min-width: 1025px) {
  .auth-container { max-width: 480px; }
  .dash-main { max-width: 800px; }
  .facilitator-grid { grid-template-columns: repeat(4, 1fr); gap: 16px; }
  .stats-row { gap: 24px; }
  .stat-card { padding: 24px 20px; }
  .stat-value { font-size: 32px; }
  .plans-container { max-width: 800px; }
  .plans-grid { flex-direction: row; flex-wrap: wrap; gap: 16px; }
  .plan-card { flex: 1 1 calc(25% - 12px); min-width: 190px; }
  .call-center { max-width: 800px; }
  .transcript-area { max-height: 320px; }
  .audio-canvas { max-width: 400px; height: 56px; }
  .call-timer-row { font-size: 36px; }
  .btn-hangup { width: 72px; height: 72px; font-size: 28px; }
}

/* ── Touch: ensure all interactive elements meet 44px minimum ── */
@media (pointer: coarse) {
  .btn-text, .resend-btn, .history-details summary {
    min-height: 44px; display: flex; align-items: center;
  }
  .code-digit { min-height: 48px; }
  .plan-buy-btn { min-height: 44px; }
  .facilitator-card { min-height: 44px; cursor: pointer; }
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}