/* ================================================
   小七 — Design System & Styles
   ================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Colors */
  --primary: #7B68EE;
  --primary-hover: #6A56E0;
  --primary-light: #B8AEFF;
  --primary-bg: #F0EDFF;
  --primary-glow: rgba(123, 104, 238, 0.25);

  --accent-warm: #FF8A65;
  --accent-warm-light: #FFD0BF;
  --accent-coral: #FF6B8A;

  --insight-bg: #EDE9FF;
  --insight-border: #C5B8FF;
  --highlight-bg: #FFF8E1;
  --highlight-border: #FFD54F;
  --result-bg: linear-gradient(135deg, #F0EDFF 0%, #E8F5E9 100%);
  --result-border: #81C784;
  --success: #66BB6A;

  --error: #EF5350;
  --error-bg: #FFEBEE;
  --error-border: #FFCDD2;

  --bg-start: #F5F3FF;
  --bg-end: #FFF5F2;
  --surface: #FFFFFF;
  --surface-hover: #F8F7FF;

  --text-primary: #2D2B3D;
  --text-secondary: #6B6980;
  --text-light: #9B99A9;
  --text-on-primary: #FFFFFF;

  --border: #E8E6F0;
  --shadow-sm: 0 2px 8px rgba(123, 104, 238, 0.08);
  --shadow-md: 0 4px 20px rgba(123, 104, 238, 0.12);
  --shadow-lg: 0 8px 40px rgba(123, 104, 238, 0.18);

  /* Spacing */
  --sp-4: 4px;
  --sp-8: 8px;
  --sp-12: 12px;
  --sp-16: 16px;
  --sp-20: 20px;
  --sp-24: 24px;
  --sp-32: 32px;
  --sp-40: 40px;
  --sp-48: 48px;

  /* Radius */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-full: 9999px;

  /* Typography */
  --font: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', system-ui, sans-serif;
  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-base: 16px;
  --fs-lg: 18px;
  --fs-xl: 22px;
  --fs-2xl: 30px;
  --fs-3xl: 40px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 200ms;
  --dur-normal: 350ms;
  --dur-slow: 500ms;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { height: 100%; -webkit-text-size-adjust: 100%; }
body {
  height: 100%;
  font-family: var(--font);
  font-size: var(--fs-base);
  color: var(--text-primary);
  background: linear-gradient(160deg, var(--bg-start), var(--bg-end));
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
#app {
  width: 100%; height: 100%;
  max-width: 480px; margin: 0 auto;
  position: relative; overflow: hidden;
}

/* ================================================
   Pages & Transitions
   ================================================ */
.page {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.page.hidden {
  opacity: 0; pointer-events: none;
  transform: translateX(30px);
}

/* ================================================
   Background Orbs
   ================================================ */
.page-bg-orbs { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.orb {
  position: absolute; border-radius: 50%;
  filter: blur(60px); opacity: 0.5;
  animation: orbFloat 8s ease-in-out infinite;
}
.orb-1 { width: 200px; height: 200px; background: var(--primary-light); top: -40px; right: -60px; }
.orb-2 { width: 160px; height: 160px; background: var(--accent-warm-light); bottom: 20%; left: -40px; animation-delay: -3s; }
.orb-3 { width: 120px; height: 120px; background: var(--primary-bg); top: 40%; right: -20px; animation-delay: -5s; }
@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(15px, -20px) scale(1.05); }
  66% { transform: translate(-10px, 10px) scale(0.95); }
}

/* ================================================
   Input Page
   ================================================ */
.input-header {
  display: flex; justify-content: flex-end;
  padding: var(--sp-12) var(--sp-16);
  position: relative; z-index: 1;
}

.icon-btn {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border: none; border-radius: 50%;
  background: rgba(255,255,255,0.7);
  color: var(--text-secondary);
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: all var(--dur-fast) var(--ease-out);
}
.icon-btn:hover { background: var(--surface); color: var(--primary); box-shadow: var(--shadow-sm); }

.input-main {
  flex: 1;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 0 var(--sp-12) var(--sp-32);
  position: relative; z-index: 1;
}
.input-main > * { width: 100%; }

/* Logo */
.logo-wrapper { position: relative; width: 100px; height: 100px; margin-bottom: var(--sp-20); }
.logo-circle {
  width: 100%; height: 100%; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, #9B8FFF 50%, var(--accent-coral) 100%);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 32px var(--primary-glow), 0 2px 8px rgba(0,0,0,0.1);
  animation: logoBreath 3s ease-in-out infinite;
}
.logo-text { font-size: 44px; font-weight: 900; color: white; text-shadow: 0 2px 4px rgba(0,0,0,0.15); }
.logo-ring {
  position: absolute; inset: -6px; border-radius: 50%;
  border: 2px solid var(--primary-light); opacity: 0.4;
  animation: logoRingSpin 12s linear infinite;
}
@keyframes logoBreath { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.04); } }
@keyframes logoRingSpin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.app-title {
  font-size: var(--fs-2xl); font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--accent-coral));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: var(--sp-4); letter-spacing: 2px;
  text-align: center; width: 100%;
}
.app-tagline {
  font-size: var(--fs-lg); color: var(--text-secondary);
  font-weight: 500; margin-bottom: var(--sp-32);
  text-align: center; width: 100%;
}

/* Input Area */
.input-area {
  width: 100%;
  background: var(--surface);
  border-radius: var(--r-lg);
  padding: var(--sp-20);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}
.input-label {
  display: block; font-size: var(--fs-sm);
  font-weight: 600; color: var(--text-secondary);
  margin-bottom: var(--sp-12);
}
.input-textarea {
  width: 100%; min-height: 80px; max-height: 160px;
  padding: var(--sp-12); font-family: var(--font);
  font-size: var(--fs-base); color: var(--text-primary);
  background: #FAFAFE; border: 2px solid var(--border);
  border-radius: var(--r-md); resize: vertical;
  transition: border-color var(--dur-fast) var(--ease-out);
  line-height: 1.7;
}
.input-textarea:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}
.input-textarea::placeholder { color: var(--text-light); }
.input-footer-row {
  display: flex; justify-content: space-between;
  align-items: center; margin-top: var(--sp-12);
}
.char-count { font-size: var(--fs-xs); color: var(--text-light); }

.btn-send {
  display: inline-flex; align-items: center; gap: var(--sp-8);
  padding: var(--sp-12) var(--sp-24);
  font-family: var(--font); font-size: var(--fs-base); font-weight: 700;
  color: white;
  background: linear-gradient(135deg, var(--primary), #9B8FFF);
  border: none; border-radius: var(--r-full); cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--dur-normal) var(--ease-spring);
}
.btn-send:hover:not(:disabled) {
  transform: translateY(-2px) scale(1.03);
  box-shadow: var(--shadow-lg);
}
.btn-send:active:not(:disabled) { transform: scale(0.97); }
.btn-send:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

/* API Hint */
.api-hint {
  display: flex; align-items: center; gap: var(--sp-8);
  margin-top: var(--sp-20);
  padding: var(--sp-12) var(--sp-16);
  background: var(--highlight-bg);
  border: 1px solid var(--highlight-border);
  border-radius: var(--r-full);
  font-size: var(--fs-sm); color: var(--text-secondary);
}
.link-btn {
  background: none; border: none;
  color: var(--primary); font-weight: 600;
  cursor: pointer; text-decoration: underline;
  font-family: var(--font); font-size: var(--fs-sm);
}

/* Name Input */
.name-input {
  width: 100%; padding: var(--sp-12);
  font-family: var(--font); font-size: var(--fs-lg);
  font-weight: 500; color: var(--text-primary);
  background: #FAFAFE; border: 2px solid var(--border);
  border-radius: var(--r-md); text-align: center;
  transition: border-color var(--dur-fast) var(--ease-out);
  line-height: 1.7;
}
.name-input:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}
.name-input::placeholder { color: var(--text-light); font-weight: 400; }

/* Greeting */
.greeting {
  font-size: var(--fs-lg); color: var(--text-secondary);
  text-align: center; margin-bottom: var(--sp-20);
  line-height: 1.6;
  animation: msgFadeIn var(--dur-normal) var(--ease-out) forwards;
}

/* ================================================
   Chat Page
   ================================================ */
#chat-page { background: linear-gradient(180deg, var(--bg-start) 0%, #FAFAFE 100%); }

.chat-header {
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: var(--sp-8) var(--sp-12) 0;
  z-index: 10;
}
.header-row {
  display: flex; align-items: center; gap: var(--sp-8);
  padding-bottom: var(--sp-8);
}
.header-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent-coral));
  color: white; font-weight: 900; font-size: var(--fs-base);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.header-info { flex: 1; }
.header-name { font-size: var(--fs-base); font-weight: 700; line-height: 1.2; }
.header-status { font-size: var(--fs-xs); color: var(--text-light); }

.progress-track {
  height: 3px; background: var(--border);
  border-radius: var(--r-full); overflow: hidden;
}
.progress-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--accent-coral));
  border-radius: var(--r-full);
  transition: width 0.6s var(--ease-out);
}

/* Chat Body */
.chat-body {
  flex: 1; overflow-y: auto; overflow-x: hidden;
  padding: var(--sp-16);
  scroll-behavior: smooth; -webkit-overflow-scrolling: touch;
}
.chat-body::-webkit-scrollbar { width: 4px; }
.chat-body::-webkit-scrollbar-thumb { background: var(--primary-light); border-radius: var(--r-full); }
.messages {
  display: flex; flex-direction: column;
  gap: var(--sp-8); padding-bottom: var(--sp-16);
}

/* ---- Message Bubbles ---- */
.msg-bot {
  max-width: 88%; align-self: flex-start;
  opacity: 0; animation: msgSlideIn var(--dur-normal) var(--ease-out) forwards;
}
.msg-bot .bubble {
  background: var(--surface); color: var(--text-primary);
  padding: var(--sp-12) var(--sp-16);
  border-radius: var(--r-md) var(--r-md) var(--r-md) var(--sp-4);
  font-size: var(--fs-base); line-height: 1.7;
  box-shadow: var(--shadow-sm); border: 1px solid var(--border);
}
.msg-bot.insight .bubble {
  background: var(--insight-bg); border-color: var(--insight-border);
  position: relative;
}
.msg-bot.insight .bubble::before {
  content: '💡'; position: absolute; top: -10px; left: 12px; font-size: 18px;
}

.msg-user {
  max-width: 80%; align-self: flex-end;
  opacity: 0; animation: msgSlideInRight var(--dur-normal) var(--ease-out) forwards;
}
.msg-user .bubble {
  background: linear-gradient(135deg, var(--primary), #9B8FFF);
  color: white; padding: var(--sp-12) var(--sp-16);
  border-radius: var(--r-md) var(--r-md) var(--sp-4) var(--r-md);
  font-size: var(--fs-base); line-height: 1.6;
  box-shadow: 0 2px 12px var(--primary-glow);
}

/* Original message card */
.msg-original {
  width: 100%; opacity: 0;
  animation: msgFadeIn var(--dur-slow) var(--ease-out) forwards;
  margin-bottom: var(--sp-8);
}
.original-card {
  background: var(--surface); border-radius: var(--r-lg);
  padding: var(--sp-16); box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}
.original-label {
  display: flex; align-items: center; gap: var(--sp-8);
  font-size: var(--fs-sm); color: var(--text-light);
  margin-bottom: var(--sp-12);
}
.original-icon {
  width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-warm), var(--accent-coral));
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; flex-shrink: 0;
}
.original-text {
  font-size: var(--fs-lg); font-weight: 500; color: var(--text-primary);
  line-height: 1.7; padding: var(--sp-12);
  background: #FAFAFA; border-radius: var(--r-sm);
  border-left: 3px solid var(--accent-warm);
}

/* Highlight card */
.msg-highlight {
  width: 92%; align-self: flex-start;
  opacity: 0; animation: msgSlideIn var(--dur-normal) var(--ease-out) forwards;
}
.highlight-card {
  background: var(--highlight-bg); border: 1px solid var(--highlight-border);
  border-radius: var(--r-md); padding: var(--sp-12) var(--sp-16);
}
.highlight-quote {
  font-size: var(--fs-lg); font-weight: 600; color: #F57F17; line-height: 1.6;
}
.highlight-quote::before { content: '\201C'; color: var(--highlight-border); font-size: 24px; font-weight: 900; }
.highlight-quote::after  { content: '\201D'; color: var(--highlight-border); font-size: 24px; font-weight: 900; }

/* Options */
.msg-options {
  width: 100%; opacity: 0;
  animation: msgFadeIn var(--dur-normal) var(--ease-out) forwards;
  margin: var(--sp-4) 0;
}
.options-grid { display: flex; flex-direction: column; gap: var(--sp-8); }
.option-btn {
  display: flex; align-items: center; gap: var(--sp-12);
  width: 100%; padding: var(--sp-12) var(--sp-16);
  font-family: var(--font); font-size: var(--fs-base); font-weight: 500;
  color: var(--text-primary); background: var(--surface);
  border: 2px solid var(--border); border-radius: var(--r-md);
  cursor: pointer; text-align: left;
  transition: all var(--dur-normal) var(--ease-spring);
  position: relative; overflow: hidden;
}
.option-btn::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--primary), #9B8FFF);
  opacity: 0; transition: opacity var(--dur-normal) var(--ease-out);
}
.option-btn span { position: relative; z-index: 1; }
.option-radio {
  width: 22px; height: 22px; border-radius: 50%;
  border: 2px solid var(--border); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--dur-normal) var(--ease-spring);
  position: relative; z-index: 1;
}
.option-btn:hover:not(.selected):not(.dimmed) {
  border-color: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.option-btn.selected {
  border-color: var(--primary);
  transform: scale(1.02);
  box-shadow: 0 4px 16px var(--primary-glow);
  cursor: default;
}
.option-btn.selected::before { opacity: 1; }
.option-btn.selected span { color: white; }
.option-btn.selected .option-radio { border-color: white; background: white; }
.option-btn.selected .option-radio::after { content: '✓'; font-size: 13px; font-weight: 900; color: var(--primary); }
.option-btn.dimmed { opacity: 0.35; transform: scale(0.97); cursor: default; pointer-events: none; }
.options-disabled .option-btn { pointer-events: none; }

/* Supplement link */
.supplement-link {
  display: inline-flex; align-items: center; gap: var(--sp-4);
  margin-top: var(--sp-8);
  padding: var(--sp-8) var(--sp-12);
  font-family: var(--font); font-size: var(--fs-sm);
  color: var(--text-light); background: none; border: none;
  cursor: pointer; border-radius: var(--r-full);
  transition: all var(--dur-fast) var(--ease-out);
}
.supplement-link:hover { color: var(--primary); background: var(--primary-bg); }

/* Result card */
.msg-result {
  width: 100%; opacity: 0;
  animation: resultAppear var(--dur-slow) var(--ease-spring) forwards;
  margin: var(--sp-8) 0;
}
.result-card {
  background: var(--result-bg); border: 2px solid var(--result-border);
  border-radius: var(--r-lg); padding: var(--sp-20);
  position: relative; overflow: hidden;
}
.result-card::before {
  content: ''; position: absolute; top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.3) 50%, transparent 60%);
  animation: shimmer 3s ease-in-out infinite;
}
@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}
.result-label {
  font-size: var(--fs-sm); font-weight: 600; color: var(--success);
  margin-bottom: var(--sp-12); display: flex; align-items: center;
  gap: var(--sp-4); position: relative;
}
.result-text {
  font-size: var(--fs-lg); font-weight: 500; color: var(--text-primary);
  line-height: 1.8; padding: var(--sp-16);
  background: rgba(255,255,255,0.7); border-radius: var(--r-sm);
  position: relative; margin-bottom: var(--sp-12);
}
.btn-copy {
  display: inline-flex; align-items: center; gap: var(--sp-8);
  padding: var(--sp-12) var(--sp-24);
  font-family: var(--font); font-size: var(--fs-base); font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--success), #43A047);
  border: none; border-radius: var(--r-full); cursor: pointer;
  box-shadow: 0 4px 16px rgba(102,187,106,0.3);
  transition: all var(--dur-normal) var(--ease-spring);
  position: relative;
}
.btn-copy:hover { transform: translateY(-2px) scale(1.03); }
.btn-copy:active { transform: scale(0.97); }
.btn-copy.copied { background: linear-gradient(135deg, #43A047, #2E7D32); }

/* Error message */
.msg-error {
  width: 100%; opacity: 0;
  animation: msgFadeIn var(--dur-normal) var(--ease-out) forwards;
  margin: var(--sp-4) 0;
}
.error-card {
  background: var(--error-bg); border: 1px solid var(--error-border);
  border-radius: var(--r-md); padding: var(--sp-12) var(--sp-16);
  display: flex; align-items: center; gap: var(--sp-12);
  font-size: var(--fs-sm); color: var(--error);
}
.btn-retry {
  flex-shrink: 0; padding: var(--sp-8) var(--sp-16);
  font-family: var(--font); font-size: var(--fs-sm); font-weight: 600;
  color: var(--error); background: white;
  border: 1px solid var(--error-border); border-radius: var(--r-full);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
}
.btn-retry:hover { background: var(--error); color: white; }

/* Typing indicator */
.msg-typing {
  align-self: flex-start; opacity: 0;
  animation: msgFadeIn var(--dur-fast) var(--ease-out) forwards;
}
.typing-bubble {
  background: var(--surface); padding: var(--sp-12) var(--sp-16);
  border-radius: var(--r-md) var(--r-md) var(--r-md) var(--sp-4);
  display: inline-flex; gap: 5px; align-items: center;
  box-shadow: var(--shadow-sm); border: 1px solid var(--border);
}
.typing-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--primary-light);
  animation: typingBounce 1.4s ease-in-out infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.15s; }
.typing-dot:nth-child(3) { animation-delay: 0.3s; }
@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ---- Chat Footer ---- */
.chat-footer {
  flex-shrink: 0;
  padding: var(--sp-8) var(--sp-16) var(--sp-20);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  display: flex; flex-direction: column;
  align-items: center; gap: var(--sp-8);
  min-height: 48px;
}
.chat-footer:empty { min-height: 0; padding: var(--sp-8) var(--sp-16); }

/* Footer Options Tray */
.footer-options {
  width: 100%;
  animation: footerSlideUp var(--dur-normal) var(--ease-out);
}
.footer-options .options-grid {
  display: flex; flex-direction: column; gap: var(--sp-8);
}
.footer-options .option-btn {
  display: flex; align-items: center; justify-content: center;
  width: 100%; padding: var(--sp-12) var(--sp-20);
  font-family: var(--font); font-size: var(--fs-base); font-weight: 500;
  color: var(--text-primary);
  background: linear-gradient(135deg, #F5F0FF 0%, #EEF3FF 100%);
  border: 1.5px solid rgba(130, 100, 220, 0.15);
  border-radius: var(--r-lg);
  cursor: pointer; text-align: center;
  transition: all var(--dur-normal) var(--ease-spring);
  position: relative; overflow: hidden;
}
.footer-options .option-btn::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--primary), #9B8FFF);
  opacity: 0; transition: opacity var(--dur-normal) var(--ease-out);
}
.footer-options .option-btn span { position: relative; z-index: 1; }
.footer-options .option-btn:hover:not(.selected):not(.dimmed) {
  background: linear-gradient(135deg, #EDE5FF 0%, #E3EDFF 100%);
  border-color: rgba(130, 100, 220, 0.3);
  transform: translateY(-1px);
  box-shadow: 0 2px 12px rgba(130, 100, 220, 0.12);
}
.footer-options .option-btn:active:not(.selected):not(.dimmed) {
  transform: scale(0.98);
}
.footer-options .option-btn.selected {
  border-color: var(--primary);
  transform: scale(1.02);
  box-shadow: 0 4px 16px var(--primary-glow);
  cursor: default;
}
.footer-options .option-btn.selected::before { opacity: 1; }
.footer-options .option-btn.selected span { color: white; }
.footer-options .option-btn.dimmed { opacity: 0.35; transform: scale(0.97); cursor: default; pointer-events: none; }

.footer-divider {
  width: 100%; height: 1px;
  background: var(--border);
  margin: var(--sp-4) 0;
}

@keyframes footerSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Supplement input area */
.supplement-area {
  width: 100%;
  display: flex; gap: var(--sp-8); align-items: flex-end;
}
.supplement-input {
  flex: 1; padding: var(--sp-12);
  font-family: var(--font); font-size: var(--fs-base);
  color: var(--text-primary); background: #FAFAFE;
  border: 2px solid var(--border); border-radius: var(--r-md);
  resize: none; min-height: 44px; max-height: 88px;
  transition: border-color var(--dur-fast) var(--ease-out);
  line-height: 1.5;
}
.supplement-input:focus { outline: none; border-color: var(--primary); }
.supplement-input::placeholder { color: var(--text-light); }
.btn-supplement-send {
  width: 44px; height: 44px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--primary); color: white;
  border: none; border-radius: 50%; cursor: pointer;
  transition: all var(--dur-fast) var(--ease-spring);
}
.btn-supplement-send:hover { background: var(--primary-hover); transform: scale(1.05); }
.btn-supplement-send:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

/* Footer buttons */
.btn-footer {
  display: inline-flex; align-items: center; gap: var(--sp-8);
  padding: var(--sp-12) var(--sp-32);
  font-family: var(--font); font-size: var(--fs-base); font-weight: 700;
  color: white;
  background: linear-gradient(135deg, var(--primary), #9B8FFF);
  border: none; border-radius: var(--r-full); cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--dur-normal) var(--ease-spring);
  min-width: 140px; justify-content: center;
}
.btn-footer:hover { transform: translateY(-2px) scale(1.03); box-shadow: var(--shadow-lg); }
.btn-footer:active { transform: scale(0.97); }
.btn-footer.warm { background: linear-gradient(135deg, var(--accent-warm), var(--accent-coral)); }

.footer-hint {
  font-size: var(--fs-xs); color: var(--text-light);
}

/* ================================================
   Settings Modal
   ================================================ */
.modal-overlay {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: flex-end; justify-content: center;
  transition: opacity var(--dur-normal) var(--ease-out);
}
.modal-overlay.hidden { opacity: 0; pointer-events: none; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.3);
  backdrop-filter: blur(4px);
}
.modal-panel {
  position: relative; z-index: 1;
  width: 100%; max-width: 480px; max-height: 85vh;
  background: var(--surface);
  border-radius: var(--r-xl) var(--r-xl) 0 0;
  box-shadow: 0 -8px 40px rgba(0,0,0,0.15);
  overflow-y: auto;
  transform: translateY(0);
  transition: transform var(--dur-normal) var(--ease-out);
}
.modal-overlay.hidden .modal-panel { transform: translateY(100%); }

.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: var(--sp-20) var(--sp-24) var(--sp-12);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--surface);
  z-index: 1;
}
.modal-header h3 { font-size: var(--fs-xl); font-weight: 700; }
.modal-body { padding: var(--sp-20) var(--sp-24) var(--sp-32); }

.form-group { margin-bottom: var(--sp-20); }
.form-group label {
  display: block; font-size: var(--fs-sm);
  font-weight: 600; color: var(--text-secondary);
  margin-bottom: var(--sp-8);
}
.form-group input[type="text"],
.form-group input[type="password"] {
  width: 100%; padding: var(--sp-12);
  font-family: var(--font); font-size: var(--fs-base);
  color: var(--text-primary); background: #FAFAFE;
  border: 2px solid var(--border); border-radius: var(--r-md);
  transition: border-color var(--dur-fast) var(--ease-out);
}
.form-group input:focus { outline: none; border-color: var(--primary); }
.form-group input::placeholder { color: var(--text-light); }
.form-hint { font-size: var(--fs-xs); color: var(--text-light); margin-bottom: var(--sp-8); }

.input-with-toggle { position: relative; }
.input-with-toggle input { padding-right: 48px; }
.toggle-btn {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  background: none; border: none; cursor: pointer;
  font-size: 18px; opacity: 0.5;
  transition: opacity var(--dur-fast);
}
.toggle-btn:hover { opacity: 1; }

.btn-primary {
  width: 100%; padding: var(--sp-12);
  font-family: var(--font); font-size: var(--fs-base); font-weight: 700;
  color: white; background: linear-gradient(135deg, var(--primary), #9B8FFF);
  border: none; border-radius: var(--r-md); cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
}
.btn-primary:hover { opacity: 0.9; }

.divider {
  height: 1px; background: var(--border);
  margin: var(--sp-24) 0;
}
.btn-danger {
  width: 100%; padding: var(--sp-12);
  font-family: var(--font); font-size: var(--fs-sm); font-weight: 600;
  color: var(--error); background: var(--error-bg);
  border: 1px solid var(--error-border); border-radius: var(--r-md);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
}
.btn-danger:hover { background: var(--error); color: white; }

/* ================================================
   Animations
   ================================================ */
@keyframes msgSlideIn {
  from { opacity: 0; transform: translateX(-20px) translateY(8px); }
  to   { opacity: 1; transform: translateX(0) translateY(0); }
}
@keyframes msgSlideInRight {
  from { opacity: 0; transform: translateX(20px) translateY(8px); }
  to   { opacity: 1; transform: translateX(0) translateY(0); }
}
@keyframes msgFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes resultAppear {
  from { opacity: 0; transform: translateY(20px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ================================================
   Responsive
   ================================================ */
@media (min-width: 481px) {
  #app {
    max-width: 440px; height: 100%; max-height: 900px;
    top: 50%; position: relative; transform: translateY(-50%);
    border-radius: var(--r-xl);
    box-shadow: 0 20px 80px rgba(0,0,0,0.12), 0 0 0 1px var(--border);
    overflow: hidden;
  }
  .page { border-radius: var(--r-xl); }
  .modal-panel { border-radius: var(--r-xl); }
}
@media (max-width: 360px) {
  :root {
    --fs-base: 15px; --fs-lg: 17px; --fs-xl: 20px;
    --fs-2xl: 26px; --fs-3xl: 34px;
  }
}

/* Entry Buttons */
.entry-buttons {
  display: flex; gap: var(--sp-12);
  margin-top: var(--sp-20); width: 100%;
}
.entry-btn {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; gap: var(--sp-4);
  padding: var(--sp-16) var(--sp-12);
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border); border-radius: var(--r-md);
  cursor: pointer; font-family: var(--font);
  transition: all var(--dur-normal) var(--ease-spring);
}
.entry-btn:hover {
  background: var(--surface); transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.entry-btn:active { transform: scale(0.97); }
.entry-icon { font-size: 24px; }
.entry-text {
  font-size: var(--fs-sm); font-weight: 600;
  color: var(--text-secondary);
}

/* Learn Modal — Knowledge Selection */
.learn-category { margin-bottom: var(--sp-24); }
.learn-category:last-child { margin-bottom: 0; }
.learn-category-title {
  display: flex; align-items: center; gap: var(--sp-8);
  font-size: var(--fs-lg); font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--sp-12);
}
.learn-category-icon { font-size: 22px; }
.learn-topics {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--sp-8);
}
.learn-topic-btn {
  padding: var(--sp-12) var(--sp-16);
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(8px);
  border: 1.5px solid var(--border); border-radius: var(--r-md);
  cursor: pointer; text-align: left;
  font-family: var(--font);
  transition: all var(--dur-normal) var(--ease-spring);
}
.learn-topic-btn:hover {
  border-color: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background: white;
}
.learn-topic-btn:active { transform: scale(0.97); }
.learn-topic-name {
  font-size: var(--fs-base); font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--sp-4);
}
.learn-topic-desc {
  font-size: var(--fs-xs); color: var(--text-light);
  line-height: 1.4;
}

/* History Panel */
.history-list {
  display: flex; flex-direction: column; gap: var(--sp-12);
}
.history-item {
  background: #FAFAFE; border-radius: var(--r-md);
  padding: var(--sp-16); border: 1px solid var(--border);
  cursor: default;
  transition: all var(--dur-fast) var(--ease-out);
}
.history-item:hover { border-color: var(--primary-light); }
.history-date {
  font-size: var(--fs-xs); color: var(--text-light);
  margin-bottom: var(--sp-8);
}
.history-input {
  font-size: var(--fs-sm); color: var(--text-secondary);
  margin-bottom: var(--sp-8); line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.history-input::before {
  content: '📩 '; font-size: var(--fs-xs);
}
.history-result {
  font-size: var(--fs-base); color: var(--text-primary);
  font-weight: 500; line-height: 1.6;
  padding: var(--sp-8) var(--sp-12);
  background: rgba(102,187,106,0.1);
  border-radius: var(--r-sm); border-left: 3px solid var(--success);
}
.history-empty {
  text-align: center; padding: var(--sp-40) 0;
  font-size: var(--fs-base); color: var(--text-light);
}

/* Utility */
.hidden { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}