/* ============================================================
   style.css — WorkBuddy 无障碍 AI 助手 完整样式
   ============================================================ */

/* ---- CSS 变量系统 ---- */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --text-primary: #1a1a1a;
  --text-secondary: #6b7280;
  --accent-color: #0066cc;
  --accent-hover: #0052a3;
  --message-user-bg: #e3f2fd;
  --message-assistant-bg: #f5f5f5;
  --border-color: #e5e7eb;
  --border-radius: 12px;
  --font-size-base: 16px;
  --focus-outline: 3px solid var(--accent-color);
}

/* ---- 暗色主题 ---- */
[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --message-user-bg: #1a3a5c;
  --message-assistant-bg: #2a2a3e;
  --accent-color: #4da6ff;
  --accent-hover: #3399ff;
  --border-color: #3a3a5c;
}

/* ---- 高对比度主题 ---- */
[data-theme="high-contrast"] {
  --bg-primary: #000000;
  --bg-secondary: #111111;
  --text-primary: #ffffff;
  --text-secondary: #cccccc;
  --message-user-bg: #000000;
  --message-assistant-bg: #111111;
  --accent-color: #ffff00;
  --accent-hover: #ffcc00;
  --border-color: #ffffff;
  --focus-outline: 5px solid #ffff00;
}

[data-theme="high-contrast"] :focus-visible {
  outline: 5px solid #ffff00;
  outline-offset: 2px;
}

/* ============================================================
   通用样式
   ============================================================ */

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

body {
  font-size: var(--font-size-base);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji",
    "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  line-height: 1.6;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  max-width: 800px;
  margin: 0 auto;
  padding: 0 16px 0 16px;
  min-height: 100vh;
}

/* ---- 屏幕阅读器专用文本 ---- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---- 跳过导航链接 ---- */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-color);
  color: #fff;
  padding: 8px 16px;
  z-index: 10000;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  font-weight: 500;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* ---- 焦点样式 ---- */
:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

button:focus-visible,
textarea:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* ---- 隐藏工具类 ---- */
.hidden {
  display: none !important;
}

/* ============================================================
   Header
   ============================================================ */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 8px;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  gap: 8px;
}

.header-actions button {
  padding: 6px 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.header-actions button:hover {
  background: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
}

/* ============================================================
   消息容器
   ============================================================ */

.message-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px 0;
  min-height: 200px;
  max-height: calc(100vh - 250px);
  overflow-y: auto;
  scroll-behavior: smooth;
}

/* ---- 消息气泡 ---- */
.message {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: var(--border-radius);
  animation: fadeIn 0.3s ease;
}

.message-user {
  align-self: flex-end;
  background-color: var(--message-user-bg);
}

.message-assistant {
  align-self: flex-start;
  background-color: var(--message-assistant-bg);
}

.message-header {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.message-role {
  font-weight: 600;
}

.message-content {
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ============================================================
   输入区域
   ============================================================ */

.input-area {
  position: sticky;
  bottom: 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 12px 0;
  margin: 0 -16px;
  padding-left: 16px;
  padding-right: 16px;
}

.input-area textarea {
  width: 100%;
  resize: none;
  min-height: 48px;
  max-height: 150px;
  font-size: var(--font-size-base);
  font-family: inherit;
  line-height: 1.5;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color 0.2s;
}

.input-area textarea:focus {
  border-color: var(--accent-color);
}

.input-area textarea:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.input-actions {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 8px;
}

/* ---- 语音按钮 ---- */
.voice-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 24px;
  border: 2px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, transform 0.2s;
  flex-shrink: 0;
  user-select: none;
  -webkit-user-select: none;
}

.voice-btn:active {
  background: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
  transform: scale(1.1);
}

.voice-btn[data-recording="true"] {
  background: #ef4444;
  color: #fff;
  border-color: #ef4444;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.5);
  }
  50% {
    box-shadow: 0 0 0 12px rgba(239, 68, 68, 0);
  }
}

/* ---- 发送按钮 ---- */
#send-btn {
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  background: var(--accent-color);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

#send-btn:hover {
  background: var(--accent-hover);
}

#send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================================
   启动器下载区
   ============================================================ */

.download-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 16px;
  margin: 12px 0 8px;
}

.download-panel h2 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.download-help,
.download-note {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 10px;
}

.download-note {
  margin-top: 10px;
  margin-bottom: 0;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--accent-color);
  color: #fff !important;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.download-btn:hover {
  background: var(--accent-hover);
}

.download-btn:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 3px;
}

[data-theme="high-contrast"] .download-btn {
  border: 2px solid #ffff00;
  color: #000 !important;
  background: #ffff00;
}

.connection-banner a {
  color: var(--accent-color);
  font-weight: 600;
}

/* ============================================================
   连接横幅
   ============================================================ */

.connection-banner {
  background: #fff3cd;
  border-left: 4px solid #ffc107;
  padding: 16px;
  margin: 8px 0;
  border-radius: 8px;
}

[data-theme="dark"] .connection-banner {
  background: #3d3520;
}

[data-theme="high-contrast"] .connection-banner {
  background: #000;
  border-color: #ffff00;
}

.connection-banner p {
  margin-bottom: 8px;
  color: var(--text-primary);
}

.connection-banner .connection-help {
  color: var(--text-secondary);
  font-size: 14px;
}

.connection-banner code {
  display: block;
  background: #2d2d2d;
  color: #ffffff;
  padding: 8px 12px;
  border-radius: 4px;
  font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  margin: 8px 0;
  user-select: all;
  -webkit-user-select: all;
  overflow-x: auto;
}

.connection-banner button {
  margin-top: 8px;
  padding: 6px 16px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--accent-color);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.connection-banner button:hover {
  background: var(--accent-hover);
}

/* ============================================================
   空状态
   ============================================================ */

.empty-state {
  text-align: center;
  color: var(--text-secondary);
  padding: 48px 16px;
}

.empty-state p:first-child {
  font-size: 18px;
  margin-bottom: 8px;
}

.empty-hint {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ============================================================
   消息动画
   ============================================================ */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
   流式消息状态
   ============================================================ */

.message-streaming .message-content::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 14px;
  background-color: var(--accent-color);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

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

/* ============================================================
   响应式 — 移动端 < 480px
   ============================================================ */

@media (max-width: 480px) {
  body {
    padding: 0 12px 0 12px;
  }

  header {
    padding: 12px 0;
  }

  header h1 {
    font-size: 1.1rem;
  }

  .header-actions button {
    padding: 4px 12px;
    font-size: 12px;
  }

  .message {
    max-width: 90%;
  }

  .input-area {
    margin: 0 -12px;
    padding-left: 12px;
    padding-right: 12px;
    padding-bottom: 12px;
  }

  .message-container {
    max-height: calc(100vh - 280px);
  }
}

/* ---- 偏好减少动画 ---- */
@media (prefers-reduced-motion: reduce) {
  .message {
    animation: none;
  }

  .voice-btn[data-recording="true"] {
    animation: none;
  }

  .message-streaming .message-content::after {
    animation: none;
  }

  .message-container {
    scroll-behavior: auto;
  }
}