/* ===== 基础变量 ===== */
:root {
  --primary: #6C5CE7;
  --primary-light: #A29BFE;
  --primary-dark: #5A4BD1;
  --primary-bg: #F0EDFF;
  --success: #00B894;
  --warning: #FDCB6E;
  --danger: #E17055;
  --text-primary: #2D3436;
  --text-secondary: #636E72;
  --text-light: #B2BEC3;
  --bg-primary: #FAFAFA;
  --bg-white: #FFFFFF;
  --bg-card: #FFFFFF;
  --border: #E8E8E8;
  --border-light: #F0F0F0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== 头部 ===== */
.header {
  background: linear-gradient(135deg, var(--primary) 0%, #8B7CF8 50%, var(--primary-light) 100%);
  color: white;
  padding: 2rem 1.5rem;
  text-align: center;
}

.header-content {
  max-width: 800px;
  margin: 0 auto;
}

.back-link {
  display: inline-block;
  color: rgba(255,255,255,0.75);
  font-size: 0.85rem;
  text-decoration: none;
  margin-bottom: 0.75rem;
  transition: color 0.2s;
}

.back-link:hover {
  color: white;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

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

.logo h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.tagline {
  font-size: 0.95rem;
  opacity: 0.9;
}

/* ===== 主区域 ===== */
.main {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 1.5rem;
  max-width: 1400px;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
}

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

/* ===== 面板通用 ===== */
.input-panel, .output-panel {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.panel-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ===== 表单 ===== */
.form {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.required {
  color: var(--danger);
}

.form-group input[type="text"],
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-white);
  color: var(--text-primary);
  transition: all 0.2s;
  outline: none;
  font-family: inherit;
}

.form-group input[type="text"]:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-light);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

/* ===== 平台选择器 ===== */
.platform-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.platform-btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: 100px;
  background: var(--bg-white);
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.platform-btn:hover {
  border-color: var(--primary-light);
  color: var(--primary);
}

.platform-btn.active {
  border-color: var(--primary);
  background: var(--primary-bg);
  color: var(--primary);
  font-weight: 600;
}

.platform-icon {
  font-size: 1rem;
}

/* ===== 风格选择器 ===== */
.style-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.style-btn {
  padding: 0.45rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: 100px;
  background: var(--bg-white);
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.style-btn:hover {
  border-color: var(--primary-light);
  color: var(--primary);
}

.style-btn.active {
  border-color: var(--primary);
  background: var(--primary-bg);
  color: var(--primary);
  font-weight: 600;
}

/* ===== 复选框 ===== */
.type-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
  user-select: none;
}

.checkbox-item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

/* ===== 提交按钮 ===== */
.submit-btn {
  width: 100%;
  padding: 0.9rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  font-family: inherit;
  margin-top: 0.5rem;
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
}

.submit-btn:active {
  transform: translateY(0);
}

.submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
}

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

/* ===== 输出区域 ===== */
.output-content {
  padding: 1.5rem;
  min-height: 400px;
}

.output-actions {
  display: flex;
  gap: 0.5rem;
}

.action-btn {
  padding: 0.4rem 0.75rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-white);
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.action-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-bg);
}

/* ===== 空状态 ===== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 350px;
  text-align: center;
  color: var(--text-light);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.empty-state p {
  font-size: 0.9rem;
}

/* ===== Markdown 结果样式（流式渲染中） ===== */
.result-markdown {
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.result-markdown.streaming {
  max-height: 600px;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.result-markdown h2 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--primary-bg);
}

.result-markdown h2:first-child {
  margin-top: 0;
}

.result-markdown h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1rem;
  margin-bottom: 0.4rem;
}

.result-markdown p {
  margin-bottom: 0.6rem;
}

.result-markdown ul, .result-markdown ol {
  padding-left: 1.5rem;
  margin-bottom: 0.6rem;
}

.result-markdown li {
  margin-bottom: 0.35rem;
}

.result-markdown strong {
  color: var(--primary-dark);
}

.result-markdown code {
  background: var(--primary-bg);
  color: var(--primary-dark);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
}

.result-markdown blockquote {
  border-left: 3px solid var(--primary-light);
  padding: 0.5rem 1rem;
  margin: 0.75rem 0;
  background: var(--primary-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}

.result-markdown hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 1.5rem 0;
}

/* ===== 结果卡片 ===== */
.result-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  overflow: hidden;
  animation: cardSlideIn 0.35s ease both;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.result-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.result-card:last-child {
  margin-bottom: 0;
}

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

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.15rem;
  background: linear-gradient(135deg, var(--primary-bg) 0%, #F8F7FF 100%);
  border-bottom: 1px solid var(--border-light);
}

.card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-icon {
  font-size: 1.15rem;
}

.card-title h3 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin: 0;
}

.card-copy-btn {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-white);
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  white-space: nowrap;
}

.card-copy-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-bg);
}

.card-copy-btn.copied {
  border-color: var(--success);
  color: var(--success);
  background: #F0FFF4;
}

.card-body {
  padding: 1rem 1.15rem;
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--text-primary);
}

.card-body p {
  margin-bottom: 0.5rem;
}

.card-body p:last-child {
  margin-bottom: 0;
}

.card-body ul, .card-body ol {
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
}

.card-body li {
  margin-bottom: 0.4rem;
  position: relative;
}

.card-body li::marker {
  color: var(--primary-light);
}

.card-body strong {
  color: var(--primary-dark);
  font-weight: 600;
}

.card-body h3 {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0.75rem 0 0.35rem;
}

.card-body h3:first-child {
  margin-top: 0;
}

/* ===== 错误卡片 ===== */
.error-card {
  text-align: center;
  padding: 2rem 1.5rem;
  background: #FFF8F6;
  border: 1px solid #FFDDD2;
  border-radius: var(--radius-md);
}

.error-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.error-card h3 {
  color: var(--danger);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.error-card > p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.error-tips {
  text-align: left;
  display: inline-block;
  background: white;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.error-tips p {
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.error-tips ul {
  padding-left: 1.25rem;
}

.error-tips li {
  margin-bottom: 0.25rem;
}

/* ===== 底部 ===== */
.footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-light);
  font-size: 0.85rem;
}
.footer a { color: var(--text-light); text-decoration: none; }
.footer a:hover { color: var(--primary); }
.footer-recommend { margin-bottom: 0.5rem; }
.footer-recommend span { color: var(--text-light); }
.footer-recommend a { color: var(--primary); margin: 0 0.5rem; font-size: 0.82rem; }

/* ===== Toast 提示 ===== */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text-primary);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 100px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease;
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* ===== 打字光标效果 ===== */
.typing-cursor::after {
  content: '|';
  animation: blink 0.8s infinite;
  color: var(--primary);
  font-weight: 300;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .header {
    padding: 1.5rem 1rem;
  }

  .logo h1 {
    font-size: 1.35rem;
  }

  .main {
    padding: 0 1rem;
    margin: 1rem auto;
    gap: 1rem;
  }

  .form {
    padding: 1rem;
  }

  .output-content {
    padding: 1rem;
  }

  .platform-selector,
  .style-selector {
    gap: 0.4rem;
  }
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--text-light);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}