/* ==========================================================================
   编码工具 · Codec Bench
   深色工程台：炭黑底 + 薄荷强调色；零外部依赖（系统字体 + 内联 SVG）
   ========================================================================== */

:root {
  --bg: #0c0e12;
  --panel: #15181f;
  --panel-hi: #171b22;
  --line: #202531;
  --line-2: #2c3441;

  --ink: #e7eaf0;
  --ink-2: #a8b1c0;
  --ink-3: #8791a1;
  --ink-4: #79839a;

  --accent: #5ad1a5;
  --accent-deep: #45c196;
  --accent-ink: #062018;

  --warn: #e9b44c;
  --err: #f2766b;

  --add: #4fb477;
  --del: #e0574f;

  --mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: "Segoe UI", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;

  --r: 12px;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 背景：细网格 + 顶部薄荷光晕 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, .017) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .017) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, #000 20%, transparent 100%);
  mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, #000 20%, transparent 100%);
}

body::after {
  content: "";
  position: fixed;
  top: -420px;
  left: 50%;
  width: min(1100px, 130vw);
  height: 720px;
  transform: translateX(-50%);
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle at center, rgba(90, 209, 165, .085), transparent 62%);
}

/* 滚动条 */
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: #2a313d;
  border: 2px solid transparent;
  background-clip: padding-box;
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover { background: #3b4553; background-clip: padding-box; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 5px; }

/* ---------------- 外壳 ---------------- */

.app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1680px;
  margin: 0 auto;
  padding: 0 clamp(12px, 2.6vw, 30px) clamp(10px, 1.8vw, 20px);
}

/* ---------------- 页头 ---------------- */

.hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: clamp(14px, 2vw, 20px) 2px clamp(12px, 1.6vw, 16px);
}

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

.mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  border-radius: 10px;
  color: var(--accent);
  background: linear-gradient(150deg, rgba(90, 209, 165, .2), rgba(90, 209, 165, .03));
  border: 1px solid rgba(90, 209, 165, .32);
  box-shadow: 0 10px 24px -16px rgba(90, 209, 165, .9);
}
.mark svg { width: 20px; height: 20px; }

.hdr__ttl { min-width: 0; }
.hdr__ttl h1 {
  margin: 0;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.25;
}
.hdr__ttl p {
  margin: 2px 0 0;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .24em;
  color: var(--ink-3);
  text-transform: uppercase;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .02);
  font-size: 12px;
  color: var(--ink-2);
  white-space: nowrap;
}
.badge i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 9px var(--accent);
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .35; }
}

/* ---------------- 功能页签 ---------------- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: rgba(18, 21, 27, .72);
}

/* 禁用脚本时功能条不会被填充，给一条纯 CSS 兜底提示，避免出现空框 */
.tabs:empty::before {
  content: "需要启用 JavaScript 才能加载功能项";
  padding: 9px 13px;
  font-size: 13px;
  color: var(--ink-3);
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--ink-2);
  font: inherit;
  font-size: 13px;
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
  transition: background .16s, color .16s, border-color .16s;
}
.tab:hover { color: var(--ink); background: rgba(255, 255, 255, .045); }
.tab__no {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .04em;
  color: var(--ink-3);
}
.tab.is-on {
  color: #d9f6ea;
  background: linear-gradient(180deg, rgba(90, 209, 165, .17), rgba(90, 209, 165, .07));
  border-color: rgba(90, 209, 165, .34);
}
.tab.is-on .tab__no { color: var(--accent); }

/* ---------------- 工作区 ---------------- */

.bench {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding-top: 10px;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 2px 3px 10px;
}
.bar__desc {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-2);
  flex: 1 1 260px;
  min-width: 0;
}
.bar__opts { display: flex; flex-wrap: wrap; gap: 6px; }

.chip {
  font: inherit;
  font-size: 12px;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: rgba(255, 255, 255, .022);
  color: var(--ink-2);
  cursor: pointer;
  transition: .15s;
  white-space: nowrap;
}
.chip:hover { color: var(--ink); border-color: #3b4553; }
.chip.is-on {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}

/* ---------------- 双栏编辑区 ---------------- */

.edit {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 84px minmax(0, 1fr);
  flex: 1;
  min-height: 0;
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .035);
  overflow: hidden;
  transition: border-color .18s, box-shadow .18s;
}
.pane:focus-within {
  border-color: rgba(90, 209, 165, .42);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .05), 0 18px 50px -32px rgba(90, 209, 165, .85);
}

.pane__hd {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px 8px 13px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .014);
}
.pane__tag {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--ink-2);
}
.pane__acts { margin-left: auto; display: flex; gap: 4px; }

.mini {
  font: inherit;
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 6px;
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  transition: .15s;
  white-space: nowrap;
}
.mini:hover { color: var(--ink); border-color: #3b4553; background: rgba(255, 255, 255, .05); }
.mini--accent { color: var(--accent); border-color: rgba(90, 209, 165, .36); }
.mini--accent:hover { background: rgba(90, 209, 165, .1); border-color: rgba(90, 209, 165, .55); }

.pane textarea {
  flex: 1;
  width: 100%;
  min-height: 0;
  margin: 0;
  padding: 13px 14px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.68;
  resize: none;
  outline: none;
  tab-size: 2;
  overflow-wrap: normal;
  overscroll-behavior: contain;
}
.pane textarea::placeholder { color: var(--ink-4); opacity: 1; }

/* ---------------- 中间操作列 ---------------- */

.mid {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 8px;
}

.mid__btn {
  width: 68px;
  padding: 9px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  background: rgba(255, 255, 255, .03);
  color: var(--ink-2);
  font: inherit;
  font-size: 11.5px;
  line-height: 1.35;
  cursor: pointer;
  transition: .16s;
}
.mid__btn:hover { color: var(--ink); border-color: #3d4857; background: rgba(255, 255, 255, .06); }
.mid__ico { font-family: var(--mono); font-size: 14px; line-height: 1.3; }

.mid__btn.is-on {
  color: var(--accent-ink);
  background-color: var(--accent);
  background-image: linear-gradient(180deg, #6ee0b5, var(--accent-deep));
  border-color: #6ee0b5;
  font-weight: 600;
  box-shadow: 0 12px 26px -16px rgba(90, 209, 165, .95);
}
.mid__btn.is-on:hover {
  color: var(--accent-ink);
  background-color: #6ee0b5;
  background-image: linear-gradient(180deg, #7ce8c0, #4ccb9d);
  border-color: #7ce8c0;
}

.mid__swap {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px dashed var(--line-2);
  border-radius: 50%;
  background: transparent;
  color: var(--ink-3);
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  transition: .16s;
}
.mid__swap:hover { color: var(--accent); border-color: rgba(90, 209, 165, .5); border-style: solid; }

/* ---------------- 差异视图 ---------------- */

.dv {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  overflow: hidden;
}

.dv__hd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 11px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .014);
}
.dv__stats { display: flex; flex-wrap: wrap; gap: 6px; font-family: var(--mono); font-size: 11.5px; }
.dv__s { padding: 2px 9px; border-radius: 5px; background: rgba(255, 255, 255, .05); color: var(--ink-2); }
.dv__s--add { color: #86e8b0; background: rgba(79, 180, 119, .16); }
.dv__s--del { color: #ffa49c; background: rgba(224, 87, 79, .16); }
.dv__s--chg { color: #f3cb7d; background: rgba(233, 180, 76, .15); }

.dv__body { flex: 1; min-height: 0; overflow: auto; overscroll-behavior: contain; }

.dv__heads {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .022);
}
.dv__heads span {
  padding: 5px 12px 5px 50px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--ink-3);
}
.dv__heads span + span { border-left: 1px solid var(--line); }

.dv__row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }

.dv__c { display: flex; gap: 8px; min-width: 0; padding-right: 10px; }
.dv__c--l { border-right: 1px solid var(--line); }

.dv__n {
  flex: 0 0 42px;
  padding: 1px 0 0;
  text-align: right;
  font-family: var(--mono);
  font-size: 10.5px;
  line-height: 22px;
  color: var(--ink-3);
  user-select: none;
}
.dv__t {
  flex: 1;
  min-width: 0;
  padding: 1px 0;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 22px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--ink);
}

.dv__row--del .dv__c--l,
.dv__row--chg .dv__c--l { background: rgba(224, 87, 79, .1); }
.dv__row--ins .dv__c--r,
.dv__row--chg .dv__c--r { background: rgba(79, 180, 119, .1); }

.dv__c--empty { background: repeating-linear-gradient(135deg, rgba(255, 255, 255, .026) 0 5px, transparent 5px 11px); }

.dv em { font-style: normal; border-radius: 2px; padding: 0 1px; }
.dv .hl-del { background: rgba(224, 87, 79, .52); color: #ffe4e1; }
.dv .hl-ins { background: rgba(79, 180, 119, .52); color: #e2fff1; }

.dv__empty {
  padding: 60px 20px;
  text-align: center;
  color: var(--ink-3);
  font-size: 13px;
}

/* ---------------- 状态栏 ---------------- */

.status {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 14px;
  padding: 9px 4px 2px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-3);
}
.status__i b { color: var(--ink-2); font-weight: 600; }
.status__msg { margin-left: auto; color: var(--accent); }
.status__msg.is-err { color: var(--err); }
.status__msg.is-warn { color: var(--warn); }
.status__time { color: var(--ink-3); min-width: 52px; text-align: right; }

/* ---------------- 兜底提示 ---------------- */

.noscript {
  position: relative;
  z-index: 2;
  margin: 20px;
  padding: 14px 18px;
  border: 1px solid rgba(233, 180, 76, .4);
  border-radius: 10px;
  background: rgba(233, 180, 76, .1);
  color: #f3d9a4;
  font-size: 13.5px;
}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (min-width: 900px) {
  body { overflow: hidden; }
  .app { height: 100vh; height: 100dvh; min-height: 0; }
}

/* 中间尺寸：收窄中间列 */
@media (max-width: 1100px) and (min-width: 900px) {
  .edit { grid-template-columns: minmax(0, 1fr) 74px minmax(0, 1fr); }
  .mid__btn { width: 60px; padding: 8px 0; }
}

/* 窄屏：上下堆叠，操作按钮横排 */
@media (max-width: 899px) {
  /* 高度交还给内容：否则 .edit 的 flex:1 会把 grid 行拉高，输入框被撑得过大 */
  .edit { flex: 0 0 auto; grid-template-columns: minmax(0, 1fr); }
  .mid {
    flex-direction: row;
    flex-wrap: wrap;
    padding: 10px 0;
    gap: 8px;
  }
  .mid__btn { width: auto; min-width: 92px; padding: 9px 18px; flex-direction: row; gap: 7px; }
  .pane textarea { min-height: 150px; height: auto; font-size: 14px; }
  .dv__body { min-height: 320px; }
}

/* 差异视图窄屏：切换为单栏（删除行在上、新增行在下） */
@media (max-width: 759px) {
  .dv__row { grid-template-columns: minmax(0, 1fr); }
  .dv__heads { display: none; }
  /* 单栏下相同行只需出现一次，否则左右两格会各渲一遍造成重复 */
  .dv__row--eq .dv__c--r { display: none; }
  .dv__c--l { border-right: 0; }
  .dv__c--empty { display: none; }
  .dv__n { flex-basis: 32px; }
  .dv__row--del .dv__c--l,
  .dv__row--chg .dv__c--l { border-left: 3px solid rgba(224, 87, 79, .75); }
  .dv__row--ins .dv__c--r,
  .dv__row--chg .dv__c--r { border-left: 3px solid rgba(79, 180, 119, .75); }
}

@media (max-width: 560px) {
  .badge { display: none; }
  .tab { padding: 8px 10px; font-size: 12.5px; }
  .tab__no { display: none; }
  .bar__desc { font-size: 12px; }
  .pane textarea { font-size: 16px; min-height: 136px; }  /* 16px 避免 iOS 聚焦缩放 */
  .status { font-size: 11px; gap: 3px 10px; }
  .status__msg { margin-left: 0; flex-basis: 100%; }
  .status__time { margin-left: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}