/* ==========================================================================
   edit.itotii.com - 在线 TXT 文本编辑器
   品牌色 #00a1b2 | 响应式 | 浅色默认 + 深色模式
   ========================================================================== */

:root {
  --brand: #00a1b2;
  --brand-dark: #00838f;
  --brand-soft: #e6f7f9;
  --brand-line: #bfe6ea;
  --bg: #f5f9fa;
  --surface: #ffffff;
  --surface-2: #eef5f6;
  --text: #16333a;
  --text-2: #4c6870;
  --border: #d8e6e9;
  --ok: #0f9d58;
  --warn: #c77700;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(22, 51, 58, .05), 0 8px 24px rgba(22, 51, 58, .06);
  --editor-font: 15px;
  --maxw: 1080px;
}

html[data-theme="dark"] {
  --brand-soft: #0d2b30;
  --brand-line: #14505a;
  --bg: #0d181b;
  --surface: #142328;
  --surface-2: #1a2d32;
  --text: #e4f1f3;
  --text-2: #9db8be;
  --border: #244047;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }

a { color: var(--brand-dark); }
html[data-theme="dark"] a { color: #4ec6d4; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 60px;
  flex-wrap: wrap;
  padding: 8px 0;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
}
.logo svg { width: 30px; height: 30px; border-radius: 8px; flex: none; }
.logo .brand-name { color: var(--brand); }
.header-nav { display: flex; gap: 18px; margin-left: auto; align-items: center; flex-wrap: wrap; }
.header-nav a { text-decoration: none; color: var(--text-2); font-size: 14px; }
.header-nav a:hover { color: var(--brand); }

.lang-select, .tool-btn, .theme-btn {
  font: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  cursor: pointer;
  transition: border-color .15s, background .15s, color .15s;
}
.lang-select:hover, .tool-btn:hover, .theme-btn:hover { border-color: var(--brand); color: var(--brand); }
.theme-btn { padding: 7px 10px; }

/* ---------- 地理定位提示条 ---------- */
.geo-banner {
  display: none;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  background: var(--brand-soft);
  border-bottom: 1px solid var(--brand-line);
  padding: 9px 0;
  font-size: 14px;
}
.geo-banner.show { display: flex; }
.geo-banner .spacer { flex: 1; }

/* ---------- Hero ---------- */
.hero { padding: 44px 0 26px; }
.hero .eyebrow {
  display: inline-block;
  background: var(--brand-soft);
  color: var(--brand-dark);
  border: 1px solid var(--brand-line);
  font-size: 13px;
  font-weight: 600;
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 14px;
}
.hero h1 {
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.25;
  margin: 0 0 14px;
  letter-spacing: -.5px;
}
.hero h1 .hl { color: var(--brand); }
.hero .lead { font-size: 17px; color: var(--text-2); max-width: 760px; margin: 0 0 10px; }
.hero .meta-line { font-size: 13.5px; color: var(--text-2); }
.hero .meta-line strong { color: var(--text); }

/* ---------- 编辑器 ---------- */
.editor-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin: 8px 0 40px;
}
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
  align-items: center;
}
.toolbar .group { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.toolbar .sep { width: 1px; align-self: stretch; background: var(--border); margin: 2px 6px; }
.tb-btn {
  font: inherit;
  font-size: 13px;
  padding: 7px 11px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: all .15s;
}
.tb-btn:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-soft); }
.tb-btn:focus-visible, .tool-btn:focus-visible, a:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}
.tb-btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }
.tb-btn.primary:hover { background: var(--brand-dark); color: #fff; }
.tb-btn.danger:hover { border-color: #d9480f; color: #d9480f; background: #fdeee7; }
html[data-theme="dark"] .tb-btn.danger:hover { background: #3a1d12; }

.font-size-ctl { display: inline-flex; align-items: center; gap: 2px; }
.font-size-ctl button { width: 30px; padding: 7px 0; text-align: center; }

.drop-hint {
  display: none;
  padding: 10px 12px;
  font-size: 13.5px;
  color: var(--brand-dark);
  background: var(--brand-soft);
  border-bottom: 1px dashed var(--brand-line);
}
.editor-card.dragover .drop-hint { display: block; }
.editor-card.dragover { border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 22%, transparent); }

#editor {
  display: block;
  width: 100%;
  min-height: 420px;
  padding: 18px 20px;
  border: 0;
  resize: vertical;
  background: var(--surface);
  color: var(--text);
  font-family: Consolas, "Courier New", "Sarasa Mono SC", monospace;
  font-size: var(--editor-font);
  line-height: 1.65;
  tab-size: 4;
}
#editor:focus { outline: none; }

.statusbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 12.5px;
  color: var(--text-2);
}
.statusbar .stat b { color: var(--text); font-weight: 600; }
.statusbar .save-dot { color: var(--ok); }

/* 查找替换面板 */
.find-panel {
  display: none;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
  align-items: center;
}
.find-panel.show { display: flex; }
.find-panel input[type="text"] {
  font: inherit;
  font-size: 14px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  min-width: 170px;
  flex: 1 1 170px;
  max-width: 260px;
}
.find-panel input[type="text"]:focus { border-color: var(--brand); outline: none; }
.find-panel label { font-size: 13px; color: var(--text-2); display: inline-flex; align-items: center; gap: 5px; user-select: none; }
.find-panel .result-count { font-size: 13px; color: var(--brand-dark); min-width: 90px; }

/* toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  font-size: 14px;
  padding: 10px 20px;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition: all .25s;
  z-index: 99;
  max-width: 86vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 通用区块 ---------- */
.section { padding: 34px 0; }
.section > .container > h2 {
  font-size: clamp(20px, 3vw, 27px);
  margin: 0 0 8px;
  letter-spacing: -.3px;
}
.section .sub { color: var(--text-2); margin: 0 0 22px; max-width: 780px; }

.grid { display: grid; gap: 16px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 860px) {
  .grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; font-size: 16.5px; }
.card p { margin: 0; color: var(--text-2); font-size: 14.5px; }
.card .icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--brand-soft);
  color: var(--brand);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 12px;
  font-weight: 700;
  font-size: 17px;
}
.card .icon svg { width: 22px; height: 22px; }

/* 事实卡 */
.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
@media (max-width: 860px) { .facts { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .facts { grid-template-columns: 1fr; } }
.fact { background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--brand); border-radius: var(--radius-sm); padding: 14px 16px; }
.fact .k { font-size: 12.5px; color: var(--text-2); }
.fact .v { font-weight: 700; font-size: 15.5px; margin-top: 2px; }

/* 表格 */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 560px; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--border); vertical-align: top; }
thead th { background: var(--surface-2); font-size: 13.5px; color: var(--text-2); white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--brand-soft); }
td.yes { color: var(--ok); font-weight: 600; }
td.no { color: var(--text-2); }

/* 步骤 */
.steps { counter-reset: step; display: grid; gap: 14px; }
.step { display: flex; gap: 14px; align-items: flex-start; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); }
.step::before {
  counter-increment: step;
  content: counter(step);
  flex: none;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px;
}
.step h3 { margin: 2px 0 4px; font-size: 15.5px; }
.step p { margin: 0; color: var(--text-2); font-size: 14px; }

/* FAQ */
.faq { display: grid; gap: 10px; max-width: 860px; }
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0; overflow: hidden; }
.faq summary { cursor: pointer; font-weight: 600; padding: 14px 18px; list-style: none; position: relative; padding-right: 44px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 18px; top: 50%; transform: translateY(-50%); color: var(--brand); font-size: 20px; font-weight: 400; transition: transform .2s; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq .faq-a { padding: 0 18px 15px; color: var(--text-2); font-size: 14.5px; margin: 0; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); margin-top: 30px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; padding: 38px 0 26px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-grid h4 { margin: 0 0 10px; font-size: 14.5px; }
.footer-grid p { font-size: 13.5px; color: var(--text-2); margin: 0; }
.footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.footer-links a { font-size: 13.5px; color: var(--text-2); text-decoration: none; }
.footer-links a:hover { color: var(--brand); }
.footer-bottom { border-top: 1px solid var(--border); padding: 16px 0; font-size: 13px; color: var(--text-2); display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: space-between; }

/* 其他 */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.notice { font-size: 13px; color: var(--text-2); background: var(--surface-2); border: 1px dashed var(--border); border-radius: var(--radius-sm); padding: 10px 14px; margin-top: 14px; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}