:root {
  --blue-sky: #1a73e8;
  --blue-light: #e8f0fe;
  --green-life: #2e7d32;
  --green-light: #e8f5e9;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-500: #64748b;
  --gray-700: #334155;
  --gray-900: #0f172a;
  --red: #ef4444;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(26, 115, 232, 0.08);
  --header-h: auto;
  --mobile-bar-h: 0px;
  --app-max-w: 1280px;
  --panel-gap: 20px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(135deg, var(--blue-light) 0%, var(--green-light) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  min-height: 100dvh;
  color: var(--gray-900);
  line-height: 1.6;
  overflow-x: hidden;
}

.app {
  max-width: var(--app-max-w);
  margin: 0 auto;
  padding: 24px 20px calc(40px + var(--mobile-bar-h));
  padding-left: max(20px, env(safe-area-inset-left));
  padding-right: max(20px, env(safe-area-inset-right));
  padding-bottom: calc(40px + var(--mobile-bar-h) + env(safe-area-inset-bottom));
}

/* ========== Header ========== */
.header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex: 1;
}

.logo-icon {
  font-size: 2.2rem;
  flex-shrink: 0;
  line-height: 1;
}

.logo-text {
  min-width: 0;
}

.logo h1 {
  font-size: clamp(1.15rem, 3vw, 1.6rem);
  color: var(--blue-sky);
  font-weight: 700;
  line-height: 1.3;
}

.logo p {
  font-size: clamp(0.78rem, 2vw, 0.9rem);
  color: var(--gray-500);
  margin-top: 2px;
  line-height: 1.4;
}

.status-badge {
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--gray-100);
  color: var(--gray-500);
  white-space: nowrap;
  flex-shrink: 0;
  align-self: flex-start;
}

.status-badge.ok {
  background: var(--green-light);
  color: var(--green-life);
}

.status-badge.error {
  background: #fef2f2;
  color: var(--red);
}

/* ========== Main Layout ========== */
.main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--panel-gap);
  align-items: stretch;
}

.panel {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  display: flex;
  flex-direction: column;
  min-height: 520px;
  min-width: 0;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.panel-header h2 {
  font-size: 1.05rem;
  color: var(--gray-700);
  white-space: nowrap;
}

/* ========== Form ========== */
.prompt-input {
  flex: 0 1 auto;
  width: 100%;
  border: 1.5px solid var(--gray-200);
  border-radius: 8px;
  padding: 14px;
  font-size: 16px;
  font-family: inherit;
  resize: vertical;
  min-height: 160px;
  max-height: 360px;
  transition: border-color 0.2s, box-shadow 0.2s;
  line-height: 1.7;
  -webkit-appearance: none;
}

.prompt-input:focus {
  outline: none;
  border-color: var(--blue-sky);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.12);
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}

.mobile-action-bar {
  display: none;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  min-height: 44px;
  border: none;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s, opacity 0.2s;
  font-family: inherit;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--blue-sky);
  color: #fff;
  flex: 1;
}

.btn-primary:hover:not(:disabled),
.btn-primary:active:not(:disabled) {
  background: #1557b0;
}

.btn-ghost {
  background: transparent;
  color: var(--blue-sky);
  border: 1px solid var(--blue-sky);
  padding: 6px 14px;
  font-size: 0.82rem;
  min-height: 36px;
}

.btn-ghost:hover,
.btn-ghost:active {
  background: var(--blue-light);
}

.btn-success {
  background: var(--green-life);
  color: #fff;
  padding: 6px 14px;
  font-size: 0.82rem;
  min-height: 36px;
}

.btn-success:hover,
.btn-success:active {
  background: #1b5e20;
}

.btn-danger {
  background: var(--red);
  color: #fff;
  min-width: 72px;
}

/* ========== Output ========== */
.output-area {
  flex: 1;
  border: 1.5px solid var(--gray-200);
  border-radius: 8px;
  padding: 16px;
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 280px;
  max-height: min(520px, calc(100vh - 280px));
  max-height: min(520px, calc(100dvh - 280px));
  background: var(--gray-50);
  -webkit-overflow-scrolling: touch;
}

.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  color: var(--gray-500);
  text-align: center;
  gap: 8px;
  padding: 16px;
}

.placeholder-icon {
  font-size: 2.5rem;
  opacity: 0.6;
}

.placeholder .hint {
  font-size: 0.82rem;
  color: var(--gray-500);
  opacity: 0.8;
  max-width: 280px;
}

.output-content {
  font-size: 0.92rem;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.output-content h1 {
  font-size: clamp(1.1rem, 4vw, 1.4rem);
  color: var(--blue-sky);
  text-align: center;
  margin: 12px 0;
  font-weight: 700;
}

.output-content h2 {
  font-size: clamp(1rem, 3vw, 1.1rem);
  color: var(--blue-sky);
  margin: 16px 0 8px;
  font-weight: 700;
}

.output-content h3 {
  font-size: clamp(0.95rem, 2.5vw, 1rem);
  color: var(--green-life);
  margin: 10px 0 6px;
  font-weight: 600;
}

.output-content strong {
  color: var(--blue-sky);
  font-weight: 700;
}

.output-content p {
  margin: 6px 0;
}

.cursor-blink {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--blue-sky);
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
  margin-left: 2px;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hidden {
  display: none !important;
}

.generating .btn-text::after {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-left: 8px;
  vertical-align: middle;
}

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

.error-msg {
  color: var(--red);
  background: #fef2f2;
  padding: 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  word-break: break-word;
}

/* ========== Image Upload ========== */
.image-upload-section {
  margin-top: 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: 8px;
  padding: 12px;
  background: var(--gray-50);
}

.image-upload-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.image-upload-header h3 {
  font-size: 0.92rem;
  color: var(--gray-700);
  font-weight: 600;
}

.image-mode-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 12px;
  padding: 4px;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 10px;
}

.image-mode-tab {
  -webkit-appearance: none;
  appearance: none;
  border: 1.5px solid transparent;
  background: #fff;
  padding: 9px 10px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--gray-500);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
  line-height: 1.3;
}

.image-mode-tab:hover:not(:disabled):not(.active) {
  color: var(--blue-sky);
  border-color: #a8c7fa;
  background: var(--blue-light);
}

.image-mode-tab.active,
.image-mode-tab[aria-selected="true"] {
  color: #fff;
  background: var(--blue-sky);
  border-color: var(--blue-sky);
  box-shadow: 0 2px 8px rgba(26, 115, 232, 0.28);
}

.image-mode-tab:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.image-mode-panel.hidden {
  display: none;
}

.ai-mode-hint {
  padding: 10px 12px;
  background: #fff;
  border: 1px dashed var(--gray-200);
  border-radius: 8px;
  margin-bottom: 10px;
  font-size: 0.85rem;
  color: var(--gray-700);
  line-height: 1.55;
}

.ai-mode-hint .hint {
  margin-top: 4px;
  color: var(--gray-500);
  font-size: 0.8rem;
}

.ai-thumb.pending,
.ai-thumb.error {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-light);
}

.ai-thumb.error {
  background: #fee2e2;
}

.ai-thumb-placeholder {
  font-size: 0.78rem;
  color: var(--gray-500);
  padding: 8px;
  text-align: center;
}

.ai-thumb.error .ai-thumb-placeholder {
  color: var(--red);
}

.ai-thumb .image-desc {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.65);
  color: #fff;
  font-size: 0.65rem;
  padding: 2px 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.image-count {
  font-size: 0.82rem;
  color: var(--gray-500);
  background: #fff;
  padding: 2px 10px;
  border-radius: 12px;
  border: 1px solid var(--gray-200);
  flex-shrink: 0;
}

.image-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 10px;
}

.image-thumb {
  position: relative;
  aspect-ratio: 1;
  border-radius: 8px;
  overflow: hidden;
  border: 1.5px solid var(--gray-200);
  background: #fff;
}

.image-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.image-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-remove:hover,
.image-remove:active {
  background: var(--red);
}

.image-index {
  position: absolute;
  bottom: 4px;
  left: 4px;
  background: rgba(26, 115, 232, 0.85);
  color: #fff;
  font-size: 0.72rem;
  padding: 1px 6px;
  border-radius: 8px;
}

.image-upload-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 16px;
  min-height: 72px;
  border: 2px dashed var(--gray-200);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  color: var(--blue-sky);
  font-weight: 600;
  font-size: 0.9rem;
  text-align: center;
}

.image-upload-btn:hover,
.image-upload-btn.dragover,
.image-upload-btn:active {
  border-color: var(--blue-sky);
  background: var(--blue-light);
}

.image-upload-btn.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.image-upload-hint {
  font-size: 0.75rem;
  color: var(--gray-500);
  font-weight: 400;
  line-height: 1.4;
}

.img-marker {
  display: inline-block;
  background: var(--blue-light);
  color: var(--blue-sky);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  margin: 6px 0;
}

.image-done-tip {
  margin-top: 12px;
  padding: 8px 12px;
  background: var(--green-light);
  color: var(--green-life);
  border-radius: 8px;
  font-size: 0.85rem;
  text-align: center;
}

.analysis-status {
  background: var(--blue-light);
  color: var(--blue-sky);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  margin-bottom: 12px;
  word-break: break-word;
}

.analysis-status.analysis-done {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
}

.analysis-item {
  margin: 6px 0;
  line-height: 1.5;
  font-size: 0.85rem;
}

.analysis-desc {
  color: var(--gray-700);
  font-size: 0.82rem;
}

.analysis-tag {
  display: inline-block;
  background: var(--blue-sky);
  color: #fff;
  font-size: 0.72rem;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 4px;
}

.image-desc {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  font-size: 0.65rem;
  padding: 3px 5px;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ========== Tablet (≤1024px) ========== */
@media (max-width: 1024px) {
  .main {
    grid-template-columns: 1fr;
  }

  .panel {
    min-height: auto;
  }

  .input-panel {
    order: 1;
  }

  .output-panel {
    order: 2;
  }

  .output-area {
    max-height: min(480px, 55vh);
    max-height: min(480px, 55dvh);
  }
}

/* ========== Mobile (≤768px) ========== */
@media (max-width: 768px) {
  :root {
    --mobile-bar-h: 68px;
  }

  .app {
    padding-top: 16px;
    padding-bottom: calc(16px + var(--mobile-bar-h) + env(safe-area-inset-bottom));
  }

  .header {
    flex-direction: column;
    align-items: stretch;
    margin-bottom: 16px;
  }

  .status-badge {
    align-self: flex-start;
  }

  .panel {
    padding: 16px;
    border-radius: 10px;
  }

  .panel-header {
    flex-direction: row;
    align-items: center;
  }

  .panel-header h2 {
    font-size: 1rem;
  }

  .prompt-input {
    min-height: 140px;
    max-height: 240px;
    padding: 12px;
  }

  .actions-desktop {
    display: none;
  }

  .mobile-action-bar {
    display: flex;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 100;
    gap: 10px;
    padding: 10px 16px;
    padding-bottom: max(10px, env(safe-area-inset-bottom));
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--gray-200);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06);
  }

  .mobile-action-bar .btn-primary {
    flex: 1;
  }

  .mobile-action-bar .btn-danger {
    flex: 0 0 auto;
    min-width: 64px;
    padding: 10px 16px;
  }

  .mobile-action-bar .btn-success {
    flex: 0 0 auto;
    min-height: 44px;
    padding: 10px 16px;
  }

  .output-panel .panel-header .btn-success {
    display: none;
  }

  .output-area {
    min-height: 220px;
    max-height: none;
    height: min(420px, calc(100dvh - 320px));
  }

  .image-preview-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
  }

  .placeholder {
    min-height: 180px;
  }

  .placeholder-icon {
    font-size: 2rem;
  }
}

/* ========== Small Phone (≤480px) ========== */
@media (max-width: 480px) {
  .logo {
    gap: 10px;
  }

  .logo-icon {
    font-size: 1.8rem;
  }

  .image-preview-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .panel-header {
    gap: 8px;
  }

  .btn-ghost {
    padding: 6px 10px;
    font-size: 0.78rem;
  }

  .output-area {
    height: min(380px, calc(100dvh - 300px));
    padding: 12px;
  }

  .analysis-item {
    font-size: 0.8rem;
  }
}

/* ========== Large Desktop (≥1400px) ========== */
@media (min-width: 1400px) {
  :root {
    --app-max-w: 1440px;
    --panel-gap: 24px;
  }

  .panel {
    min-height: 580px;
  }

  .output-area {
    max-height: 600px;
  }

  .prompt-input {
    min-height: 200px;
  }
}

/* ========== Hover only on pointer devices ========== */
@media (hover: hover) {
  .btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
  }
}

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

  html {
    scroll-behavior: auto;
  }
}