:root {
  --grad-main: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --grad-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --grad-warning: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent: #667eea;
  --text: #1a1a2e;
  --text-light: #6b7280;
  --bg: #f8f9ff;
  --card: #ffffff;
  --radius: 16px;
  --shadow: 0 4px 20px rgba(102, 126, 234, 0.15);
  --shadow-strong: 0 12px 30px rgba(102, 126, 234, 0.2);
  --tab-height: 60px;
  --header-height: 56px;
  --safe-bottom: env(safe-area-inset-bottom);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, rgba(102, 126, 234, 0.18), transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(240, 147, 251, 0.18), transparent 55%),
    var(--bg);
  min-height: 100vh;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  color: inherit;
}

button:active {
  transform: scale(0.95);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: var(--header-height) 1fr calc(var(--tab-height) + var(--safe-bottom));
}

.app-header {
  height: var(--header-height);
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--grad-main);
  color: #fff;
  font-weight: 600;
  box-shadow: var(--shadow);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-button {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.app-main {
  padding: 16px 16px calc(16px + var(--safe-bottom));
  overflow-y: auto;
  position: relative;
}

.view {
  animation: slideIn 0.35s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(12px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}

.card + .card {
  margin-top: 14px;
}

.primary-button {
  background: var(--grad-main);
  color: #fff;
  border-radius: 999px;
  padding: 12px 20px;
  font-weight: 600;
  box-shadow: var(--shadow-strong);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.secondary-button {
  background: #fff;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 600;
  box-shadow: var(--shadow);
  color: var(--accent);
}

.tabbar {
  height: calc(var(--tab-height) + var(--safe-bottom));
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid rgba(102, 126, 234, 0.1);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding-bottom: var(--safe-bottom);
  position: sticky;
  bottom: 0;
  backdrop-filter: blur(12px);
}

.tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 12px;
  color: var(--text-light);
  transition: color 0.2s ease;
}

.tab.active {
  color: var(--accent);
}

.tab-emoji {
  font-size: 20px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--tab-height) + 24px + var(--safe-bottom));
  transform: translateX(-50%);
  background: rgba(17, 24, 39, 0.92);
  color: #fff;
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.toast.show {
  opacity: 1;
}

.skeleton {
  background: linear-gradient(90deg, rgba(226, 232, 240, 0.6) 25%, rgba(226, 232, 240, 0.9) 37%, rgba(226, 232, 240, 0.6) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.2s infinite;
  border-radius: 12px;
}

@keyframes shimmer {
  0% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0 50%;
  }
}

.confetti {
  position: fixed;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  pointer-events: none;
  animation: confetti 2s ease forwards;
}

@keyframes confetti {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 1;
  }
  100% {
    transform: translate(var(--x), var(--y)) scale(0.6);
    opacity: 0;
  }
}

.chat-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.chat-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.chat-row.user {
  justify-content: flex-end;
}

.chat-bubble {
  max-width: 70%;
  padding: 12px 14px;
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.4;
}

.chat-bubble.ai {
  background: #fff;
  box-shadow: var(--shadow);
}

.chat-bubble.user {
  background: var(--grad-success);
  color: #fff;
  border-bottom-right-radius: 6px;
}

.chat-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(102, 126, 234, 0.15);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.chat-input {
  position: sticky;
  bottom: calc(var(--tab-height) + var(--safe-bottom));
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.96);
  border-radius: 16px;
  box-shadow: var(--shadow);
  margin-top: 12px;
}

.chat-input input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 14px;
}

.ghost-button {
  padding: 8px 12px;
  border-radius: 12px;
  background: rgba(102, 126, 234, 0.1);
}

.progress-bar {
  height: 10px;
  border-radius: 999px;
  background: rgba(102, 126, 234, 0.12);
  overflow: hidden;
  margin-top: 8px;
}

.progress-bar span {
  display: block;
  height: 100%;
  background: var(--grad-success);
  border-radius: 999px;
}

.module-scroll {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(160px, 1fr);
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.module-card {
  background: #fff;
  border-radius: 18px;
  padding: 12px;
  box-shadow: var(--shadow);
  min-height: 150px;
}

.module-arc {
  width: 72px;
  height: 72px;
  margin-top: 8px;
}

.record-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.record-button {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--grad-main);
  box-shadow: var(--shadow-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 24px;
  position: relative;
  transition: transform 0.2s ease;
}

.record-button.recording {
  transform: scale(1.08);
}

.record-button::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  animation: ripple 1.4s ease infinite;
  opacity: 0;
}

.record-button.recording::after {
  opacity: 1;
}

@keyframes ripple {
  0% {
    transform: scale(1);
    opacity: 0.6;
  }
  100% {
    transform: scale(1.6);
    opacity: 0;
  }
}

.wave {
  display: flex;
  gap: 4px;
}

.wave span {
  width: 6px;
  height: 24px;
  background: var(--grad-warning);
  border-radius: 999px;
  animation: wave 1s ease infinite;
}

.wave span:nth-child(2) { animation-delay: 0.15s; }
.wave span:nth-child(3) { animation-delay: 0.3s; }
.wave span:nth-child(4) { animation-delay: 0.45s; }

@keyframes wave {
  0%, 100% {
    transform: scaleY(0.6);
  }
  50% {
    transform: scaleY(1.2);
  }
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 12px;
}

.score-pill {
  background: rgba(79, 172, 254, 0.12);
  color: #2f80ed;
  padding: 8px 10px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 13px;
}

.badge-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.badge {
  padding: 12px;
  background: #fff;
  border-radius: 14px;
  text-align: center;
  box-shadow: var(--shadow);
  font-size: 12px;
}

.timeline {
  display: grid;
  gap: 12px;
}

.timeline-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
}

.timeline-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 6px;
}

.banner {
  background: var(--grad-main);
  color: #fff;
  border-radius: 20px;
  padding: 16px;
  box-shadow: var(--shadow-strong);
}

.lock-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.input-group {
  display: grid;
  gap: 10px;
}

.input-group input {
  border: 1px solid rgba(102, 126, 234, 0.3);
  border-radius: 12px;
  padding: 12px;
  font-size: 14px;
}

.thinking {
  display: inline-flex;
  gap: 4px;
}

.thinking span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(102, 126, 234, 0.7);
  animation: pulse 1s ease infinite;
}

.thinking span:nth-child(2) { animation-delay: 0.2s; }
.thinking span:nth-child(3) { animation-delay: 0.4s; }

@keyframes pulse {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50% { transform: translateY(-4px); opacity: 1; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f111a;
    --card: #171925;
    --text: #f1f5f9;
    --text-light: #9aa4b2;
    --shadow: 0 6px 20px rgba(15, 17, 26, 0.5);
  }

  body {
    background: radial-gradient(circle at top, rgba(102, 126, 234, 0.25), transparent 55%),
      radial-gradient(circle at 80% 20%, rgba(240, 147, 251, 0.22), transparent 60%),
      var(--bg);
  }

  .tabbar {
    background: rgba(23, 25, 37, 0.92);
  }

  .chat-bubble.ai,
  .module-card,
  .lock-card {
    background: rgba(23, 25, 37, 0.9);
  }
}