/*
 * 霓 (Né) Voice Call UI
 * ─────────────────────────────────────────
 * Canvas: #000000 (pure black) absorbs noise
 * Light:  #FFFFFF (pure white) illuminates paths
 * Accent: Neon emerald #00D26A (LINE green) + violet glow
 * Ratio:  0.618 golden ratio governs spacing
 * Style:  Muji breathing + Esport neon keyframes
 * ─────────────────────────────────────────
 * Reset CSS — 歸零，重置所有預設偏見
 */

/* ========== RESET & CANVAS ========== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* 霓 Core Palette */
  --black: #000000;
  --white: #FFFFFF;
  --surface: #0a0a0a;
  --surface-elevated: #111111;
  --border: #1a1a1a;
  --border-light: #222222;

  /* Neon Accent — LINE Green */
  --neon-green: #00D26A;
  --neon-green-dim: rgba(0, 210, 106, 0.15);
  --neon-green-glow: rgba(0, 210, 106, 0.4);

  /* Neon Secondary — Violet (霓虹) */
  --neon-violet: #8B5CF6;
  --neon-violet-dim: rgba(139, 92, 246, 0.15);
  --neon-violet-glow: rgba(139, 92, 246, 0.3);

  /* Semantic */
  --danger: #FF3B30;
  --danger-glow: rgba(255, 59, 48, 0.3);
  --amber: #FFD60A;
  --amber-dim: rgba(255, 214, 10, 0.15);
  --text-primary: #F5F5F7;
  --text-secondary: #86868B;
  --text-tertiary: #48484A;

  /* Spacing (golden ratio inspired) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;

  /* Typography */
  --font: -apple-system, "SF Pro Display", "Helvetica Neue", system-ui, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", monospace;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 200ms;
  --duration-normal: 400ms;
  --duration-slow: 800ms;

  /* Safe areas */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

html, body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font);
  background: var(--black);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
}

#app {
  width: 100%;
  height: 100vh;
  height: 100dvh;
  position: relative;
  overflow: hidden;
}

/* ========== PAGE SYSTEM ========== */
.page {
  display: none;
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}
.page.active {
  display: flex;
  opacity: 1;
  z-index: 1;
}

/* ========================================
   LOGIN PAGE
   ======================================== */
#page-login.active {
  align-items: center;
  justify-content: center;
  background: var(--black);
}

.login-wrapper {
  width: 100%;
  max-width: 320px;
  padding: 0 var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.login-avatar {
  margin-bottom: var(--space-lg);
}

.login-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--white);
  margin-bottom: var(--space-xs);
}

.login-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

#form-login {
  width: 100%;
}

.input-group {
  margin-bottom: var(--space-md);
}

.input-group input {
  width: 100%;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font);
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
  outline: none;
}

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

.input-group input:focus {
  border-color: var(--neon-green);
  box-shadow: 0 0 0 3px var(--neon-green-dim);
}

.error-text {
  color: var(--danger);
  font-size: 0.8rem;
  min-height: 1.2em;
  margin-bottom: var(--space-sm);
  text-align: center;
}

.btn-primary {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius-full);
  background: var(--neon-green);
  color: var(--black);
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-fast) var(--ease-out);
}

.btn-primary:hover {
  transform: scale(1.02);
  box-shadow: 0 0 24px var(--neon-green-glow);
}

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

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* ========================================
   AVATAR CIRCLES
   ======================================== */
.avatar-circle {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  font-weight: 800;
  color: var(--white);
  background: linear-gradient(135deg, var(--neon-green), var(--neon-violet));
  user-select: none;
  flex-shrink: 0;
}

.avatar-circle--login {
  width: 72px;
  height: 72px;
  font-size: 2rem;
}

.avatar-circle--large {
  width: 96px;
  height: 96px;
  font-size: 2.5rem;
}

.avatar-circle--call {
  width: min(100px, 15vh);
  height: min(100px, 15vh);
  font-size: min(2.75rem, 5vh);
  position: relative;
  z-index: 2;
}

/* ========================================
   HOME PAGE
   ======================================== */
#page-home.active {
  flex-direction: column;
  background: var(--black);
}

.home-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-md);
}

.home-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
}

.home-header__left,
.home-header__right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.health-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--text-tertiary);
  transition: background var(--duration-fast);
}
.health-dot.online { background: var(--neon-green); box-shadow: 0 0 6px var(--neon-green-glow); }
.health-dot.offline { background: var(--danger); }

.health-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.key-indicators {
  display: flex;
  gap: 8px;
  margin-right: 12px;
  padding-right: 12px;
  border-right: 1px solid var(--border);
}

.key-indicator {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.65rem;
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  letter-spacing: 0.03em;
}

.key-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--text-tertiary);
  transition: background var(--duration-fast), box-shadow var(--duration-fast);
}

.key-indicator.ok .key-dot {
  background: var(--neon-green);
  box-shadow: 0 0 6px var(--neon-green-glow);
}

.key-indicator.ok {
  color: var(--text-secondary);
}

.key-indicator.fail .key-dot {
  background: var(--danger);
  box-shadow: 0 0 6px var(--danger-glow);
}

.key-indicator.fail {
  color: var(--danger);
}

.user-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.btn-ghost {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-family: var(--font);
  cursor: pointer;
  transition: color var(--duration-fast), border-color var(--duration-fast);
}
.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-light);
}

/* Contact Card */
.contact-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  /* Golden ratio positioning: 38.2% from top */
  padding-bottom: 20%;
}

.contact-name {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--white);
}

.contact-status {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Call Button (LINE style circle) */
.home-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding-bottom: var(--space-2xl);
}

.btn-call-circle {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--neon-green);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-normal) var(--ease-out);
  box-shadow: 0 0 20px var(--neon-green-dim);
}

.btn-call-circle:hover {
  transform: scale(1.08);
  box-shadow: 0 0 40px var(--neon-green-glow), 0 0 80px var(--neon-green-dim);
}

.btn-call-circle:active {
  transform: scale(0.95);
}

.call-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

/* ========================================
   CALL PAGE — LINE Voice Call Style
   ======================================== */
#page-call.active {
  flex-direction: column;
  background: var(--black);
}

.call-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

/* Background glow effect */
.call-wrapper::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 200%;
  height: 80%;
  background: radial-gradient(ellipse at center, var(--neon-green-dim) 0%, transparent 60%);
  opacity: 0.3;
  pointer-events: none;
  animation: breathe 4s ease-in-out infinite;
}

/* Top Info */
.call-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg) var(--space-md) var(--space-sm);
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}

.call-top__status {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--duration-fast);
}

.call-top__status.ringing {
  color: var(--neon-green);
  animation: textPulse 1.5s ease-in-out infinite;
}

.call-top__timer {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-tertiary);
  min-height: 1.2em;
  margin-top: var(--space-xs);
  letter-spacing: 0.05em;
}

/* Center Avatar */
.call-center {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  position: relative;
  z-index: 1;
  min-height: 0;
  overflow: hidden;
}

.avatar-ring {
  position: relative;
  width: min(120px, 18vh);
  height: min(120px, 18vh);
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar-ring__pulse {
  position: absolute;
  inset: -10px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--neon-green);
  opacity: 0;
  animation: ringPulse 2s ease-out infinite;
}

.avatar-ring__pulse--delay {
  animation-delay: 0.8s;
}

/* Hide pulse when connected */
.call-wrapper.connected .avatar-ring__pulse {
  animation: none;
  opacity: 0;
}

.call-contact-name {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--white);
}

.call-activity {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  min-height: 1.2em;
  transition: color var(--duration-fast);
}

.call-activity.active {
  color: var(--neon-green);
  animation: textPulse 1.2s ease-in-out infinite;
}

/* Waveform */
.waveform-container {
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}

#waveform-canvas {
  width: 100%;
  height: 48px;
  border-radius: var(--radius-lg);
  opacity: 0.8;
}

/* Bottom Actions — LINE Style */
.call-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-md) calc(var(--space-lg) + 44px);
  position: relative;
  z-index: 2;
  flex-shrink: 0;
}

.call-actions-row {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  width: 100%;
  max-width: 320px;
}

.action-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.action-btn {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--surface-elevated);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring),
              background var(--duration-fast),
              color var(--duration-fast),
              box-shadow var(--duration-fast);
}

.action-btn:hover:not(:disabled) {
  transform: scale(1.08);
  background: var(--border-light);
}

.action-btn:active:not(:disabled) {
  transform: scale(0.92);
}

.action-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.action-btn.active {
  background: var(--neon-green);
  color: var(--black);
  box-shadow: 0 0 16px var(--neon-green-glow);
}

.action-btn.muted {
  background: var(--danger);
  color: var(--white);
  box-shadow: 0 0 16px var(--danger-glow);
}

.action-icon {
  width: 24px;
  height: 24px;
}

.action-label {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  white-space: nowrap;
}

/* Hangup Button */
.btn-hangup {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--danger);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-fast);
  box-shadow: 0 0 20px var(--danger-glow);
}

.btn-hangup:hover {
  transform: scale(1.08);
  box-shadow: 0 0 40px var(--danger-glow);
}

.btn-hangup:active {
  transform: scale(0.92);
}

/* Transcript Drawer */
.transcript-drawer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  transform: translateY(calc(100% - 40px));
  transition: transform var(--duration-normal) var(--ease-out);
  z-index: 10;
  max-height: 50vh;
}

.transcript-drawer.open {
  transform: translateY(0);
}

.transcript-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  user-select: none;
}

.transcript-toggle__bar {
  width: 32px;
  height: 3px;
  border-radius: var(--radius-full);
  background: var(--border-light);
  margin-bottom: var(--space-xs);
}

.transcript-toggle__text {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

.transcript-box {
  max-height: calc(50vh - 44px);
  overflow-y: auto;
  padding: 0 var(--space-md) var(--space-lg);
  font-size: 0.8rem;
  line-height: 1.6;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.transcript-box .line {
  margin-bottom: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
}

.transcript-box .line.user {
  color: var(--neon-green);
  background: var(--neon-green-dim);
}

.transcript-box .line.assistant {
  color: var(--text-primary);
  background: var(--surface-elevated);
}

.transcript-box .line.system {
  color: var(--text-tertiary);
  font-size: 0.75rem;
  text-align: center;
  background: transparent;
}

/* ========================================
   PWA INSTALL BANNER
   ======================================== */
.install-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  padding-bottom: calc(var(--space-md) + var(--safe-bottom));
  background: var(--surface);
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  z-index: 100;
}

.install-banner span { flex: 1; }

.btn-install {
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-full);
  background: var(--neon-green);
  color: var(--black);
  font-weight: 700;
  font-size: 0.8rem;
  cursor: pointer;
}

.btn-dismiss {
  padding: 4px 8px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  font-size: 1.2rem;
  cursor: pointer;
}

/* ========================================
   ANIMATIONS — 霓虹 Keyframes
   ======================================== */
@keyframes ringPulse {
  0% {
    transform: scale(1);
    opacity: 0.6;
  }
  100% {
    transform: scale(1.6);
    opacity: 0;
  }
}

@keyframes breathe {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 0.4; }
}

@keyframes textPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

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

@keyframes neonGlow {
  0%, 100% {
    box-shadow: 0 0 10px var(--neon-green-dim), 0 0 30px var(--neon-green-dim);
  }
  50% {
    box-shadow: 0 0 20px var(--neon-green-glow), 0 0 60px var(--neon-green-dim);
  }
}

/* Connected state: gentle neon glow on avatar */
.call-wrapper.connected .avatar-circle--call {
  animation: neonGlow 3s ease-in-out infinite;
}

/* ========================================
   PWA STANDALONE MODE
   ======================================== */
@media all and (display-mode: standalone) {
  html, body {
    overscroll-behavior-y: contain;
    touch-action: manipulation;
    position: fixed;
    width: 100%;
    height: 100%;
    overflow: hidden;
  }
  #app {
    height: 100%;
    overflow: hidden;
  }
}

/* ========================================
   RESPONSIVE — 12-column grid awareness
   ======================================== */
@media (min-width: 480px) {
  .call-actions-row {
    gap: var(--space-2xl);
  }
  .action-btn {
    width: 64px;
    height: 64px;
  }
  .action-icon {
    width: 28px;
    height: 28px;
  }
}

@media (min-width: 768px) {
  .call-center {
    padding-bottom: 15%;
  }
  .avatar-circle--call {
    width: 120px;
    height: 120px;
    font-size: 3.5rem;
  }
  .avatar-ring {
    width: 140px;
    height: 140px;
  }
}

/* Short viewport — compact call layout */
@media (max-height: 600px) {
  .call-top {
    padding: var(--space-sm) var(--space-md) var(--space-xs);
  }
  .avatar-ring {
    width: 80px;
    height: 80px;
  }
  .avatar-circle--call {
    width: 64px;
    height: 64px;
    font-size: 1.75rem;
  }
  .call-contact-name {
    font-size: 1.1rem;
  }
  .call-center {
    gap: var(--space-xs);
  }
  #waveform-canvas {
    height: 32px;
  }
  .call-bottom {
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md) calc(var(--space-md) + 44px);
  }
  .action-btn {
    width: 44px;
    height: 44px;
  }
  .action-icon {
    width: 20px;
    height: 20px;
  }
  .btn-hangup {
    width: 52px;
    height: 52px;
  }
}