/* ============================================================
   NovaForge — 科技风格 (v2 with ReactBits effects)
   ============================================================ */

:root {
  --bg-primary: #07070d;
  --bg-secondary: #0d0d1a;
  --bg-card: rgba(255,255,255,0.03);
  --bg-hover: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.06);
  --border-light: rgba(255,255,255,0.1);
  --text: #eeeef5;
  --text-secondary: rgba(255,255,255,0.55);
  --text-muted: rgba(255,255,255,0.3);
  --accent-1: #6366f1;
  --accent-2: #a855f7;
  --accent-3: #06b6d4;
  --glow: rgba(99,102,241,0.2);
  --radius: 16px;
  --radius-sm: 10px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Noto Sans SC', sans-serif;
  background: var(--bg-primary);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   Particle Canvas
   ============================================================ */
.particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ============================================================
   Layout
   ============================================================ */
.app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 1000px;
  margin: 0 auto;
}

/* ============================================================
   Header
   ============================================================ */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: rgba(7,7,13,0.7);
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo { display: flex; align-items: center; gap: 10px; }
.logo-svg { flex-shrink: 0; }
.logo-text { font-size: 18px; font-weight: 700; letter-spacing: -0.5px; }

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

.glass-select {
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  outline: none;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  font-family: inherit;
  transition: border-color 0.2s;
}

.glass-select:hover { border-color: var(--border-light); }
.glass-select:focus { border-color: var(--accent-1); }

.status-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(52,168,83,0.1);
  border: 1px solid rgba(52,168,83,0.2);
  border-radius: 20px;
  font-size: 12px;
  color: #34a853;
  font-weight: 500;
}

.status-glow {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #34a853;
  box-shadow: 0 0 8px rgba(52,168,83,0.5);
}

/* ============================================================
   Main
   ============================================================ */
.main {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  scroll-behavior: smooth;
}

.main::-webkit-scrollbar { width: 4px; }
.main::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ============================================================
   Hero — with Glitch & Gradient effects
   ============================================================ */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 62vh;
  padding: 32px 0;
  animation: heroFade 1s ease;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.15);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 28px;
  backdrop-filter: blur(8px);
  animation: badgePulse 3s ease-in-out infinite;
}

@keyframes badgePulse {
  0%, 100% { border-color: rgba(99,102,241,0.15); }
  50% { border-color: rgba(168,85,247,0.3); box-shadow: 0 0 20px rgba(99,102,241,0.08); }
}

.badge-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent-1);
  box-shadow: 0 0 10px var(--accent-1);
  animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 6px var(--accent-1); }
  50% { box-shadow: 0 0 16px var(--accent-1), 0 0 30px rgba(99,102,241,0.3); }
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 14px;
  position: relative;
}

.gradient-text {
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 40%, #06b6d4 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradShift 4s ease-in-out infinite;
}

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

/* Glitch effect */
.glitch-trigger {
  position: relative;
}

.glitch-layer {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 40%, #06b6d4 80%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1.1;
  opacity: 0;
  pointer-events: none;
  z-index: -1;
}

.glitch-trigger:hover .glitch-layer {
  opacity: 0.7;
  animation: glitchAnim 0.4s ease infinite;
  clip-path: inset(20% 0 30% 0);
}

.glitch-trigger:hover .glitch-layer:nth-child(3) {
  animation: glitchAnim2 0.4s ease infinite reverse;
  clip-path: inset(60% 0 10% 0);
}

@keyframes glitchAnim {
  0% { transform: translate(0); }
  20% { transform: translate(-3px, 2px); }
  40% { transform: translate(2px, -1px); }
  60% { transform: translate(-1px, 3px); }
  80% { transform: translate(3px, -2px); }
  100% { transform: translate(0); }
}

@keyframes glitchAnim2 {
  0% { transform: translate(0); }
  20% { transform: translate(2px, -2px); }
  40% { transform: translate(-2px, 1px); }
  60% { transform: translate(1px, -3px); }
  80% { transform: translate(-3px, 2px); }
  100% { transform: translate(0); }
}

.hero-sub {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 36px;
  letter-spacing: 0.3px;
}

/* Prompt chips / pills */
.pill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  max-width: 560px;
}

.pill {
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  white-space: nowrap;
}

.pill:hover {
  background: rgba(99,102,241,0.15);
  border-color: rgba(99,102,241,0.3);
  color: var(--text);
  transform: translateY(-1px);
}

/* ============================================================
   Results
   ============================================================ */
.results-area {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-bottom: 16px;
}

.result-group {
  animation: slideUp 0.4s ease;
}

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

.result-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--text-secondary);
}

.result-meta-dot {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--text-muted);
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 560px) {
  .result-grid { grid-template-columns: 1fr; }
}

.result-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.result-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  padding: 1px;
  background: conic-gradient(
    transparent, transparent, transparent,
    rgba(99,102,241,0.3),
    rgba(168,85,247,0.4),
    rgba(6,182,212,0.3),
    transparent, transparent, transparent
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.5s;
  pointer-events: none;
}

.result-card:hover::before {
  opacity: 1;
  animation: borderSpin 2s linear infinite;
}

@keyframes borderSpin {
  to { transform: rotate(360deg); }
}

.result-card:hover {
  border-color: transparent;
  transform: translateY(-3px) scale(1.01);
  box-shadow: 0 12px 48px rgba(99,102,241,0.15);
}

.result-card img {
  width: 100%;
  display: block;
  aspect-ratio: 1;
  object-fit: cover;
}

.result-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  opacity: 0;
  transition: opacity 0.2s;
  backdrop-filter: blur(4px);
}

.result-card:hover .result-card-overlay { opacity: 1; }

.result-card-overlay button {
  padding: 8px 16px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.1);
  color: #fff;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s;
  backdrop-filter: blur(8px);
}

.result-card-overlay button:hover {
  background: var(--accent-1);
  border-color: var(--accent-1);
}

.result-footer {
  padding: 8px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

.result-provider {
  color: var(--accent-2);
  font-weight: 500;
}

/* ============================================================
   Conversation / Agent Chat
   ============================================================ */
.conversation {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 16px;
}

.msg-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  animation: slideUp 0.35s ease;
}

.msg-user {
  display: flex;
  justify-content: flex-end;
  padding: 0 0 0 60px;
}

.msg-user .msg-text {
  background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(168,85,247,0.1));
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: 18px 18px 4px 18px;
  padding: 10px 16px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  max-width: 100%;
  word-break: break-word;
}

.msg-assistant {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 4px 0 12px;
}

.msg-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

@media (max-width: 560px) {
  .msg-images { grid-template-columns: 1fr; }
}

.msg-image-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.msg-image-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  padding: 1px;
  background: conic-gradient(
    transparent, transparent, transparent,
    rgba(99,102,241,0.3),
    rgba(168,85,247,0.4),
    rgba(6,182,212,0.3),
    transparent, transparent, transparent
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.5s;
  pointer-events: none;
}

.msg-image-card:hover::before {
  opacity: 1;
  animation: borderSpin 2s linear infinite;
}

.msg-image-card:hover {
  border-color: transparent;
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 8px 32px rgba(99,102,241,0.12);
}

.msg-image-card img {
  width: 100%;
  display: block;
  aspect-ratio: 1;
  object-fit: cover;
}

.msg-image-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  opacity: 0;
  transition: opacity 0.2s;
  backdrop-filter: blur(4px);
}

.msg-image-card:hover .msg-image-overlay { opacity: 1; }

.msg-image-overlay button {
  padding: 6px 14px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.1);
  color: #fff;
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s;
}

.msg-image-overlay button:hover {
  background: var(--accent-1);
  border-color: var(--accent-1);
}

.msg-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
  padding: 0 2px;
}

.msg-meta-provider {
  color: var(--accent-2);
  font-weight: 500;
}

.msg-timestamp {
  color: var(--text-muted);
}

.conv-actions {
  display: flex;
  justify-content: center;
  padding: 8px 0;
}

.conv-actions .clear-btn {
  padding: 6px 18px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}

.conv-actions .clear-btn:hover {
  border-color: rgba(234,67,53,0.3);
  background: rgba(234,67,53,0.08);
  color: #ea4335;
}

/* New badge for first message */
.first-msg-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
  padding: 16px 0 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.first-msg-badge::before,
.first-msg-badge::after {
  content: '';
  width: 40px;
  height: 1px;
  background: var(--border);
}

/* ============================================================
   Input
   ============================================================ */
.input-section {
  position: relative;
  padding: 12px 24px 20px;
  background: linear-gradient(transparent, rgba(10,10,15,0.95) 40%);
  flex-shrink: 0;
}

.input-inner {
  max-width: 720px;
  margin: 0 auto;
}

.input-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 6px;
  transition: border-color 0.2s;
  min-height: 52px;
}

.input-row:focus-within {
  border-color: rgba(99,102,241,0.4);
  box-shadow: 0 0 20px rgba(99,102,241,0.08);
}

/* Left side of input: ref chip + textarea */
.input-left {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  flex: 1;
  min-width: 0;
}

@keyframes chipIn {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes chipOut {
  from { opacity: 1; transform: scale(1); }
  to { opacity: 0; transform: scale(0.8); }
}

/* Counter box */
.counter-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  flex-shrink: 0;
  height: 38px;
}

.cnt-btn {
  width: 32px;
  height: 100%;
  border: none;
  background: none;
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.cnt-btn:hover { background: var(--bg-hover); }

#cntVal {
  width: 26px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.input-field {
  flex: 1;
}

.prompt-ta {
  width: 100%;
  border: none;
  background: none;
  color: var(--text);
  font-size: 14px;
  outline: none;
  resize: none;
  font-family: inherit;
  line-height: 1.5;
  padding: 8px 4px;
  max-height: 100px;
}

.prompt-ta::placeholder { color: var(--text-muted); }

.gen-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 22px;
  height: 40px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

.gen-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.15) 50%, transparent 100%);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.gen-btn:hover::after {
  transform: translateX(100%);
}

.gen-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(99,102,241,0.35);
}

.gen-btn:active {
  transform: translateY(0) scale(0.98);
}

.gen-btn:disabled {
  opacity: 0.35;
  cursor: default;
  transform: none !important;
  box-shadow: none !important;
}

/* Input actions row */
.input-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.upload-btn {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  position: relative;
}

.upload-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-light);
  color: var(--text);
}

.upload-ring {
  position: absolute;
  top: 0; left: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.upload-btn.uploading .upload-icon {
  opacity: 0;
}

.upload-btn.uploading .upload-ring {
  opacity: 1;
  animation: uploadSpin 0.8s linear infinite;
  transform-origin: center;
}

@keyframes uploadSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.upload-btn.uploading {
  pointer-events: none;
  opacity: 0.6;
}

.upload-btn.has-image {
  border-color: rgba(99,102,241,0.3);
  background: rgba(99,102,241,0.1);
  color: var(--accent-1);
}

/* Ref chips container */
.ref-chips {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.ref-chip {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 2px;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.25);
  border-radius: 8px;
  flex-shrink: 0;
  animation: chipIn 0.2s ease;
  position: relative;
  cursor: pointer;
  transition: all 0.15s;
}

.ref-chip:hover {
  border-color: rgba(99,102,241,0.5);
  box-shadow: 0 0 12px rgba(99,102,241,0.15);
}

.ref-chip img {
  width: 28px;
  height: 28px;
  border-radius: 5px;
  object-fit: cover;
  display: block;
}

.ref-chip-x {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.5);
  color: rgba(255,255,255,0.8);
  font-size: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  position: absolute;
  top: -5px;
  right: -5px;
  transition: all 0.15s;
  opacity: 0;
}

.ref-chip:hover .ref-chip-x {
  opacity: 1;
}

.ref-chip-x:hover {
  background: rgba(234,67,53,0.8);
  color: #fff;
  transform: scale(1.15);
}

/* Drop zone overlay */
.input-section.drag-over .input-row {
  border-color: rgba(99,102,241,0.5);
  box-shadow: 0 0 30px rgba(99,102,241,0.12);
  background: rgba(99,102,241,0.05);
}

.input-section.drag-over::before {
  content: '📸 拖放图片到此处上传';
  position: absolute;
  inset: -2px;
  border-radius: 18px;
  background: rgba(7,7,13,0.85);
  border: 2px dashed rgba(99,102,241,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  color: var(--accent-1);
  backdrop-filter: blur(12px);
  z-index: 20;
  animation: dropFade 0.2s ease;
}

@keyframes dropFade {
  from { opacity: 0; transform: scale(0.97); }
  to { opacity: 1; transform: scale(1); }
}

/* Ref image preview modal */
.ref-preview-modal {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ref-preview-modal.hidden { display: none; }

.ref-preview-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(8px);
}

.ref-preview-content {
  position: relative;
  max-width: 90vw;
  max-height: 80vh;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 48px rgba(0,0,0,0.5);
}

.ref-preview-content img {
  max-width: 90vw;
  max-height: 75vh;
  display: block;
}

.ref-preview-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.5);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.ref-preview-close:hover {
  background: rgba(234,67,53,0.7);
  transform: scale(1.1);
}

/* ============================================================
   Toast
   ============================================================ */

@keyframes barSlide {
  0% { transform: translateX(-100%); }
  50% { transform: translateX(200%); }
  100% { transform: translateX(-100%); }
}

/* ============================================================
   Preview Modal
   ============================================================ */
.preview-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-modal.hidden { display: none; }

.preview-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(8px);
}

.preview-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 85vw;
}

.preview-img {
  max-width: 100%;
  max-height: 75vh;
  border-radius: 16px;
  box-shadow: 0 8px 48px rgba(0,0,0,0.4);
}

.preview-bar {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.preview-btn {
  padding: 8px 20px;
  border-radius: 12px;
  border: none;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: #fff;
}

.preview-btn:hover { box-shadow: 0 4px 16px rgba(99,102,241,0.3); }

.preview-btn-ghost {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
}

.preview-btn-ghost:hover { background: rgba(255,255,255,0.15); }

/* ============================================================
   Toast
   ============================================================ */
.toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 20px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 500;
  z-index: 200;
  backdrop-filter: blur(12px);
  transition: all 0.3s;
  white-space: nowrap;
}

.toast.success {
  background: rgba(52,168,83,0.15);
  border: 1px solid rgba(52,168,83,0.3);
  color: #34a853;
}

.toast.error {
  background: rgba(234,67,53,0.15);
  border: 1px solid rgba(234,67,53,0.3);
  color: #ea4335;
}

.toast.info {
  background: rgba(99,102,241,0.15);
  border: 1px solid rgba(99,102,241,0.3);
  color: var(--accent-1);
}

.toast.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(12px);
  pointer-events: none;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  .header { padding: 12px 16px; flex-wrap: wrap; gap: 8px; }
  .header-center { order: 3; width: 100%; justify-content: center; }
  .hero-title { font-size: 28px; }
  .input-section { padding: 8px 16px 16px; }
  .counter-box { display: none; }
}

/* ============================================================
   Scrollbar
   ============================================================ */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }