/* Chunks web — iOS 风格基调,深浅色跟随系统 */

:root {
  --bg: #f2f2f7;
  --card: #ffffff;
  --text: #000000;
  --secondary: rgba(60, 60, 67, 0.6);
  --tertiary: rgba(60, 60, 67, 0.3);
  --separator: rgba(60, 60, 67, 0.29);
  --accent: #007aff;
  --red: #ff3b30;
  --green: #34c759;
  --orange: #ff9500;
  --disabled: rgba(120, 120, 128, 0.3);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #ffffff;
    --secondary: rgba(235, 235, 245, 0.6);
    --tertiary: rgba(235, 235, 245, 0.3);
    --separator: rgba(84, 84, 88, 0.6);
    --accent: #0a84ff;
    --red: #ff453a;
    --green: #30d158;
    --orange: #ff9f0a;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  height: 100dvh;
  overflow: hidden;
}

#panels { flex: 1; overflow: hidden; position: relative; }

.panel {
  height: 100%;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: calc(8px + env(safe-area-inset-top)) 16px 24px;
}

.panel[hidden] { display: none; }

.large-title {
  font-size: 32px;
  font-weight: 700;
  padding: 8px 0 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ===== Tab bar ===== */

#tabbar {
  display: flex;
  border-top: 0.5px solid var(--separator);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding-bottom: env(safe-area-inset-bottom);
}

.tab {
  flex: 1;
  background: none;
  border: none;
  color: var(--secondary);
  font-size: 10px;
  padding: 6px 0 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  cursor: pointer;
}

.tab svg { width: 26px; height: 26px; }
.tab.active { color: var(--accent); }

/* ===== 通用组件 ===== */

.card {
  background: var(--card);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}

.btn-primary {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 16px;
}

.btn-primary:disabled { background: var(--disabled); }

.banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 16px;
}

.banner.green { background: color-mix(in srgb, var(--green) 15%, transparent); color: var(--green); }
.banner.gray { background: color-mix(in srgb, var(--secondary) 15%, transparent); color: var(--secondary); }
.banner.red {
  background: color-mix(in srgb, var(--red) 12%, transparent);
  color: var(--red);
  justify-content: flex-start;
}
.banner.red .retry { margin-left: auto; font-weight: 600; color: var(--red); background: none; border: none; font-size: 14px; cursor: pointer; }

textarea.input {
  width: 100%;
  min-height: 88px;
  border: none;
  resize: none;
  background: var(--card);
  color: var(--text);
  border-radius: 12px;
  padding: 14px;
  font-size: 17px;
  font-family: inherit;
  line-height: 1.4;
  outline: none;
  margin-bottom: 16px;
}

.section-label {
  font-size: 13px;
  color: var(--secondary);
  padding: 0 4px 8px;
}

.speaker-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.speaker-btn svg { width: 22px; height: 22px; }

/* 翻译结果 */
.result-row { display: flex; align-items: flex-start; gap: 8px; }
.result-text { flex: 1; font-size: 19px; font-weight: 500; line-height: 1.45; user-select: text; -webkit-user-select: text; }

.phrase-item { padding: 12px; }
.phrase-item + .phrase-item { border-top: 0.5px solid var(--separator); }
.phrase-en { font-size: 17px; font-weight: 500; user-select: text; -webkit-user-select: text; }
.phrase-zh { font-size: 14px; color: var(--secondary); margin-top: 4px; }
.phrase-example { font-size: 13px; color: var(--tertiary); font-style: italic; margin-top: 4px; }

.hint-empty { text-align: center; font-size: 14px; color: var(--secondary); padding: 24px 0; }

/* ===== 空态 ===== */

.empty-state { text-align: center; padding: 64px 24px; color: var(--secondary); }
.empty-state .icon { font-size: 44px; margin-bottom: 12px; }
.empty-state .title { font-size: 20px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.empty-state .desc { font-size: 14px; line-height: 1.5; white-space: pre-line; }

/* ===== 卡片库 ===== */

.search-input {
  width: 100%;
  padding: 9px 12px;
  border: none;
  border-radius: 10px;
  background: color-mix(in srgb, var(--secondary) 12%, transparent);
  color: var(--text);
  font-size: 16px;
  font-family: inherit;
  outline: none;
  margin-bottom: 12px;
}

.lib-list { background: var(--card); border-radius: 12px; overflow: hidden; }
.lib-row { display: flex; align-items: center; padding: 10px 12px 10px 16px; gap: 8px; }
.lib-row + .lib-row { border-top: 0.5px solid var(--separator); }
.lib-row .body { flex: 1; min-width: 0; }
.lib-en { font-size: 17px; font-weight: 500; }
.lib-zh { font-size: 14px; color: var(--secondary); margin-top: 2px; }
.lib-meta { display: flex; justify-content: space-between; font-size: 12px; color: var(--secondary); margin-top: 4px; }
.due-red { color: var(--red); }
.due-orange { color: var(--orange); }
.due-green { color: var(--green); }
.delete-btn {
  background: none;
  border: none;
  color: var(--tertiary);
  cursor: pointer;
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.delete-btn svg { width: 18px; height: 18px; }

/* ===== 复习 ===== */

.stats { display: flex; padding: 16px 0; background: var(--card); border-radius: 12px; margin-bottom: 16px; }
.stat-cell { flex: 1; text-align: center; }
.stat-cell .value { font-size: 28px; font-weight: 600; }
.stat-cell .label { font-size: 12px; color: var(--secondary); margin-top: 4px; }
.stat-divider { width: 0.5px; background: var(--separator); margin: 6px 0; }

.finished-card { text-align: center; padding: 60px 0; }
.finished-card .check { font-size: 56px; color: var(--green); }
.finished-card .title { font-size: 20px; font-weight: 600; margin-top: 8px; }
.finished-card .sub { font-size: 14px; color: var(--secondary); margin-top: 4px; }

.direction-toggle {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  padding: 6px 8px;
}

.review-progress { text-align: center; font-size: 13px; color: var(--secondary); padding: 4px 0 8px; }

.flashcard-stage { padding: 12px 4px; perspective: 1000px; touch-action: pan-y; }

.flashcard {
  position: relative;
  min-height: 320px;
  transform-style: preserve-3d;
  transition: transform 0.45s ease-in-out;
  cursor: pointer;
}
.flashcard.flipped { transform: rotateY(180deg); }
.flashcard.dragging { transition: none; }

.face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--card);
  border-radius: 16px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  overflow: hidden;
  text-align: center;
}
.face.back { transform: rotateY(180deg); }

.face .main { font-size: 26px; font-weight: 600; line-height: 1.35; }
.face .main.zh { font-weight: 500; }
.face .sub { font-size: 15px; color: var(--secondary); }
.face .example { font-size: 14px; color: var(--secondary); font-style: italic; max-height: 4.2em; overflow: hidden; }
.face .source { font-size: 12px; color: var(--tertiary); }
.face .flip-hint { position: absolute; bottom: 16px; left: 0; right: 0; font-size: 13px; color: var(--tertiary); }

/* 屏幕边缘光晕 */
.glow {
  position: fixed;
  top: 50%;
  width: 1400px;
  height: 480px;
  border-radius: 50%;
  filter: blur(70px);
  pointer-events: none;
  opacity: 0;
  z-index: 5;
}
.glow.left { left: 0; transform: translate(-92%, -50%); background: radial-gradient(closest-side, rgba(255, 59, 48, 0.85), rgba(255, 59, 48, 0.4), transparent); }
.glow.right { right: 0; transform: translate(92%, -50%); background: radial-gradient(closest-side, rgba(52, 199, 89, 0.85), rgba(52, 199, 89, 0.4), transparent); }

/* ===== 设置 ===== */

.form-card { background: var(--card); border-radius: 12px; margin-bottom: 8px; overflow: hidden; }
.form-footer { font-size: 13px; color: var(--secondary); padding: 6px 16px 16px; line-height: 1.45; }

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  min-height: 44px;
  font-size: 16px;
}
.form-row + .form-row { border-top: 0.5px solid var(--separator); }
.form-row .label { flex-shrink: 0; }
.form-row .value { color: var(--secondary); font-size: 15px; text-align: right; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.form-row input {
  flex: 1;
  border: none;
  background: none;
  color: var(--text);
  font-size: 16px;
  font-family: inherit;
  outline: none;
  text-align: left;
  min-width: 0;
}
.form-row input::placeholder { color: var(--tertiary); }

.form-row select {
  border: none;
  background: none;
  color: var(--secondary);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  text-align: right;
  direction: rtl;
  max-width: 60%;
}
.form-row select option { direction: ltr; }

.row-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 12px 16px;
  min-height: 44px;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 16px;
  font-family: inherit;
  cursor: pointer;
}
.form-row + .row-btn, .row-btn + .row-btn, .row-btn + .form-row { border-top: 0.5px solid var(--separator); }
.row-btn:disabled { color: var(--tertiary); }
.row-btn.destructive { color: var(--red); }