/* ============================================
   Kelin Design System — Tokens (standalone)
   ============================================ */
:root {
  /* Canvas */
  --color-canvas: #f0ede6;
  --color-canvas-subtle: #e8e5dd;
  --color-canvas-invert: #2c2c2a;

  /* Ink */
  --color-ink: #2c2c2a;
  --color-ink-secondary: #6b6b65;
  --color-ink-tertiary: #9a9a92;
  --color-ink-ghost: #c5c5bd;

  /* Accent */
  --color-accent: #4a6d47;
  --color-accent-hover: #3d5b3b;
  --color-accent-subtle: rgba(92, 107, 79, 0.08);
  --color-accent-muted: rgba(92, 107, 79, 0.15);

  /* Semantic */
  --color-success: #5c6b4f;
  --color-success-subtle: rgba(92, 107, 79, 0.1);
  --color-warning: #c49a2a;
  --color-warning-subtle: rgba(196, 154, 42, 0.1);
  --color-error: #c23d2e;
  --color-error-subtle: rgba(194, 61, 46, 0.1);

  /* Surface & Border */
  --color-surface: #f4f2ec;
  --color-border: #ddd8d0;
  --color-border-subtle: #ebe7e1;

  /* Typography */
  --font-body: "Montserrat", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --text-body: 1rem;
  --text-body-sm: 0.875rem;
  --text-caption: 0.75rem;
  --text-title: clamp(1.125rem, 2vw, 1.5rem);
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --leading-normal: 1.6;
  --leading-snug: 1.35;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Motion */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --duration-fast: 150ms;
  --duration-normal: 200ms;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: var(--fw-regular);
  line-height: var(--leading-normal);
  color: var(--color-ink);
  background: var(--color-canvas);
  -webkit-font-smoothing: antialiased;
}

/* ============================================
   Layout
   ============================================ */
.app {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-5);
  min-height: 100vh;
}

.header {
  margin-bottom: var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.header h1 {
  font-size: var(--text-title);
  font-weight: var(--fw-semibold);
  color: var(--color-ink);
  line-height: var(--leading-snug);
}

.header p {
  color: var(--color-ink-secondary);
  font-size: var(--text-body-sm);
  margin-top: var(--space-1);
}

.user-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-body-sm);
  color: var(--color-ink-secondary);
  flex-shrink: 0;
}

.user-bar .username {
  font-weight: var(--fw-medium);
  color: var(--color-ink);
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-ink-tertiary);
  font-size: var(--text-caption);
  cursor: pointer;
  padding: 0;
  font-family: var(--font-body);
}

.btn-link:hover { color: var(--color-error); }

/* ============================================
   Card
   ============================================ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-5);
}

.card-title {
  font-size: var(--text-body-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-ink);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.card-title .icon {
  width: 16px;
  height: 16px;
  opacity: 0.5;
}

/* ============================================
   Form Elements
   ============================================ */
.field {
  margin-bottom: var(--space-4);
}

.field:last-child { margin-bottom: 0; }

.label {
  display: block;
  font-size: var(--text-caption);
  font-weight: var(--fw-medium);
  color: var(--color-ink-secondary);
  margin-bottom: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-body-sm);
  color: var(--color-ink);
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-out);
}

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

.input::placeholder {
  color: var(--color-ink-ghost);
}

.input-mono {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
}

/* ============================================
   Button
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  font-family: var(--font-body);
  font-size: var(--text-body-sm);
  font-weight: var(--fw-medium);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover { background: var(--color-accent-hover); }
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-ghost {
  background: transparent;
  color: var(--color-ink-secondary);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  background: var(--color-accent-subtle);
  color: var(--color-ink);
}

.btn-full { width: 100%; }

/* ============================================
   Toolbar (URL + Submit)
   ============================================ */
.toolbar {
  display: flex;
  gap: var(--space-2);
}

.toolbar .input { flex: 1; }

/* URL 输入框右侧的清除按钮 */
.url-input-wrapper {
  position: relative;
  flex: 1;
}

.url-input-wrapper .input {
  width: 100%;
  padding-right: 44px;  /* 给 × 按钮留位 */
}

.btn-clear-url {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--color-ink-tertiary);
  cursor: pointer;
  width: 36px;            /* 触摸友好,Apple HIG 推荐 ≥ 44pt 但宿主输入框只有约 36px 高 */
  height: 36px;
  border-radius: 50%;
  font-size: 18px;
  line-height: 1;
  padding: 0;
  display: none;  /* 输入为空时隐藏 */
  align-items: center;
  justify-content: center;
  transition: all var(--duration-fast) var(--ease-out);
  -webkit-tap-highlight-color: transparent;
}

.btn-clear-url:active {
  background: var(--color-canvas-subtle);
}

@media (hover: hover) {
  .btn-clear-url:hover {
    background: var(--color-canvas-subtle);
    color: var(--color-ink);
  }
}

.btn-clear-url.visible { display: flex; }

/* ============================================
   Status & Progress
   ============================================ */
.status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-body-sm);
  margin-bottom: var(--space-4);
}

.status-info {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.status-error {
  background: var(--color-error-subtle);
  color: var(--color-error);
}

.status-success {
  background: var(--color-success-subtle);
  color: var(--color-success);
}

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

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  flex-shrink: 0;
}

/* ============================================
   Result
   ============================================ */
.result-box {
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
  min-height: 200px;
  max-height: 480px;
  overflow-y: auto;
  font-size: var(--text-body-sm);
  line-height: var(--leading-normal);
  white-space: pre-wrap;
  word-break: break-all;
}

.result-box-compact {
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-body-sm);
  line-height: var(--leading-normal);
  font-weight: var(--fw-medium);
  word-break: break-all;
}

.result-box:empty::before {
  content: "字幕内容将显示在这里...";
  color: var(--color-ink-ghost);
}

.result-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* ============================================
   Video Info
   ============================================ */
.video-info {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-accent-subtle);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-4);
  font-size: var(--text-body-sm);
  color: var(--color-ink-secondary);
}

/* ============================================
   Help Text
   ============================================ */
.help {
  font-size: var(--text-caption);
  color: var(--color-ink-tertiary);
  margin-top: var(--space-1);
}

.hint-box {
  background: var(--color-warning-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-caption);
  color: var(--color-ink-secondary);
  line-height: var(--leading-normal);
  margin-top: var(--space-4);
}

.hint-box code {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  background: rgba(0,0,0,0.05);
  padding: 1px 4px;
  border-radius: 3px;
  word-break: break-all;
  overflow-wrap: anywhere;
}

/* ============================================
   Login Form
   ============================================ */
.login-card {
  max-width: 360px;
  margin: 0 auto;
}

.login-card .field { margin-bottom: var(--space-3); }

.login-switch {
  text-align: center;
  margin-top: var(--space-4);
  font-size: var(--text-caption);
  color: var(--color-ink-tertiary);
}

.login-switch a {
  color: var(--color-accent);
  cursor: pointer;
  text-decoration: none;
}

.login-switch a:hover { text-decoration: underline; }

/* ============================================
   History List
   ============================================ */
.history-item {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out);
}

.history-item:hover {
  background: var(--color-accent-subtle);
}

.history-item-title {
  font-size: var(--text-body-sm);
  font-weight: var(--fw-medium);
  color: var(--color-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-time {
  font-size: var(--text-caption);
  color: var(--color-ink-tertiary);
  margin-top: 2px;
}

.history-empty {
  text-align: center;
  color: var(--color-ink-ghost);
  font-size: var(--text-body-sm);
  padding: var(--space-4);
}

/* ============================================
   History Drawer (right-slide panel)
   ──────────────────────────────────────────────
   遮罩 + 抽屉两层 fixed,默认隐藏在视口外。
   动画用 transform/opacity,GPU 友好,低端机不卡。
   ============================================ */
.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out);
  z-index: 100;
}

.drawer-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 480px;
  max-width: 100vw;
  /* 100dvh = dynamic viewport,iOS Safari URL bar 显隐时正确收缩 */
  height: 100vh;
  height: 100dvh;
  background: var(--color-canvas);
  border-left: 1px solid var(--color-border);
  transform: translateX(100%);
  transition: transform var(--duration-normal) var(--ease-out);
  z-index: 101;
  /* grid 比 flex 更稳:row1 = header 自适应,row2 = body 占满剩余且可滚 */
  display: grid;
  grid-template-rows: auto 1fr;
}

.drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

.drawer-title {
  font-size: var(--text-body);
  font-weight: var(--fw-semibold);
  color: var(--color-ink);
}

.drawer-close {
  background: none;
  border: none;
  color: var(--color-ink-tertiary);
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
  -webkit-tap-highlight-color: transparent;
}

@media (hover: hover) {
  .drawer-close:hover {
    background: var(--color-accent-subtle);
    color: var(--color-ink);
  }
}

.drawer-close:active {
  background: var(--color-accent-muted);
}

.drawer-body {
  min-height: 0;  /* grid 1fr 也有 min-content 默认值的坑,显式置零确保滚动启用 */
  overflow-y: auto;
  padding: var(--space-5);
  -webkit-overflow-scrolling: touch;
  /* mobile 必备:明确允许纵向 pan,防止浏览器把手势抢走当下拉刷新 */
  touch-action: pan-y;
  /* 阻止滚到边缘后把滚动透传给外层 body */
  overscroll-behavior: contain;
}

.drawer-field {
  margin-bottom: var(--space-5);
}

.drawer-field:last-child {
  margin-bottom: 0;
}

.drawer-field-label {
  font-size: var(--text-caption);
  font-weight: var(--fw-medium);
  color: var(--color-ink-secondary);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.drawer-field-value {
  font-size: var(--text-body-sm);
  color: var(--color-ink);
  word-break: break-all;
}

.drawer-field-value a {
  color: var(--color-accent);
  text-decoration: none;
}

.drawer-field-value a:hover {
  text-decoration: underline;
}

.drawer-subtitle {
  font-size: var(--text-body-sm);
  color: var(--color-ink);
  white-space: pre-wrap;
  line-height: var(--leading-normal);
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
}

@media (max-width: 640px) {
  .drawer {
    width: 100vw;
  }
}

/* ============================================
   Tool Grid — 卡片首页(tools.kelin.center)
   ────────────────────────────────────────────
   每张卡片 = 一个工具入口。复用 .card 的视觉语言,
   但作为 <a> 加 hover lift 让"可点击"感扑面而来。
   ============================================ */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-ink);
  cursor: pointer;
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
  position: relative;
  min-height: 160px;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent-muted);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.tool-card-icon {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.tool-card-title {
  font-size: var(--text-title);
  font-weight: var(--fw-semibold);
  line-height: var(--leading-snug);
}

.tool-card-desc {
  font-size: var(--text-body-sm);
  color: var(--color-ink-secondary);
  line-height: var(--leading-normal);
  flex: 1;
}

.tool-card-status {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  font-size: var(--text-caption);
  font-weight: var(--fw-medium);
  padding: 2px 8px;
  border-radius: 999px;
}

.tool-card-status-ready {
  color: var(--color-success);
  background: var(--color-success-subtle);
}

.tool-card-status-soon {
  color: var(--color-ink-tertiary);
  background: var(--color-canvas-subtle);
}

.tool-card-disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.tool-card-disabled:hover {
  transform: none;
  border-color: var(--color-border);
  box-shadow: none;
}