/* ===== 设计 Token：实色、轻边框、去渐变与毛玻璃 ===== */
:root {
  --bg: #F6F7F9;
  --bg2: #F1F3F6;
  --card: #FFFFFF;
  --primary: #2563EB;
  --primary-d: #1D4ED8;
  --text: #1F2329;
  --muted: #6B7280;
  --text3: #9AA0AA;
  --ok: #16A34A;
  --no: #DC2626;
  --warn: #D97706;
  --border: #E6E8EC;
  --info: #2563EB;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04);
}
/* 手动深色（优先级高于「跟随系统」） */
:root[data-theme="dark"] {
  --bg: #15171C;
  --bg2: #262A32;
  --card: #1E2127;
  --primary: #3B82F6;
  --primary-d: #60A5FA;
  --text: #E8EAED;
  --muted: #9AA0AA;
  --text3: #6B7280;
  --border: #2A2E36;
  --info: #3B82F6;
}
/* 跟随系统的暗色（用户未手动选择时生效） */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15171C;
    --bg2: #262A32;
    --card: #1E2127;
    --primary: #3B82F6;
    --primary-d: #60A5FA;
    --text: #E8EAED;
    --muted: #9AA0AA;
    --text3: #6B7280;
    --border: #2A2E36;
    --info: #3B82F6;
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }

/* ---- 顶部进度条（请求进行中显示） ---- */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; height: 3px;
  background: transparent; z-index: 80; overflow: hidden; pointer-events: none;
}
.topbar.active::before {
  content: ""; position: absolute; height: 100%; width: 40%;
  background: var(--primary);
  animation: indet 1.1s ease-in-out infinite;
}
@keyframes indet { 0% { left: -40%; } 100% { left: 100%; } }

/* ---- 顶栏（sticky 实色，含手动主题切换） ---- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--card); border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1040px; margin: 0 auto; padding: 11px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand { display: flex; align-items: center; gap: 9px; min-width: 0; }
.brand-logo { font-size: 22px; line-height: 1; }
.brand-name { font-weight: 700; font-size: 16px; letter-spacing: .3px; }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.userbar {
  padding: 5px 12px; background: var(--bg2); color: var(--primary);
  border-radius: 999px; font-size: 13px; white-space: nowrap;
}
.theme-toggle {
  width: 40px; height: 40px; flex: none; border-radius: 10px;
  border: 1px solid var(--border); background: var(--bg2); color: var(--text);
  font-size: 18px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center;
  transition: background .15s, border-color .15s;
}
.theme-toggle:hover { background: var(--bg); border-color: var(--primary); }
.theme-toggle:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ---- Hero（简洁标题区） ---- */
.hero { text-align: center; padding: 22px 14px 4px; }
.hero h1 { margin: 0; font-size: 22px; letter-spacing: .3px; }
@media (min-width: 768px) { .hero h1 { font-size: 26px; } }
.hero .sub { margin: 6px 0 0; color: var(--muted); font-size: 13px; }

/* ---- 布局：手机单列，桌面双列网格 ---- */
.app { max-width: 480px; margin: 0 auto; padding: 0 14px 28px; }
.grid { display: block; }
@media (min-width: 768px) {
  .app { max-width: 1040px; padding: 0 24px 44px; }
  .grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 10px;
  }
  .card--convert { grid-column: 1 / -1; }
  .card--history { grid-column: 1 / -1; }
  .card { margin-top: 0; }
}

/* ---- Card（轻边框，无 hover 位移 / 无重阴影） ---- */
.card {
  background: var(--card); border-radius: var(--radius); padding: 16px;
  margin-top: 14px; border: 1px solid var(--border); box-shadow: var(--shadow);
}
@media (min-width: 768px) { .card { padding: 22px; } }
.card-title { font-weight: 700; font-size: 16px; margin-bottom: 12px; display: flex; align-items: center; gap: 7px; }
.sub2 { color: var(--muted); font-size: 13px; margin-bottom: 8px; }

/* ---- Dropzone ---- */
.drop {
  display: block; border: 2px dashed var(--border); border-radius: 12px;
  padding: 26px 12px; text-align: center; cursor: pointer;
  background: var(--bg2); transition: border-color .15s, background .15s;
}
.drop.small { padding: 18px 12px; }
.drop:hover { border-color: var(--primary); }
.drop.over { border-color: var(--primary); background: rgba(37, 99, 235, .06); }
.drop:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.drop-inner .ic { font-size: 26px; }
#dropText { color: var(--muted); margin-top: 6px; font-size: 14px; }
.fname { margin-top: 6px; color: var(--text); font-size: 13px; word-break: break-all; font-weight: 600; }

/* ---- Target pills ---- */
.targets { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.pill {
  padding: 8px 14px; border-radius: 20px; border: 1px solid var(--border);
  background: var(--card); color: var(--text); font-size: 13px; cursor: pointer; transition: border-color .15s, color .15s;
}
.pill:hover { border-color: var(--primary); }
.pill:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.pill.sel { background: rgba(37, 99, 235, .08); border-color: var(--primary); color: var(--primary); font-weight: 600; }
.hint { color: var(--warn); font-size: 13px; }

/* ---- 长图开关（switch） ---- */
.switch {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: 14px; padding: 12px 14px; background: var(--bg2);
  border: 1px solid var(--border); border-radius: 12px; cursor: pointer;
}
.switch .lbl { font-size: 13px; color: var(--text); }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.switch .track {
  width: 44px; height: 26px; border-radius: 999px; background: #cfd6e4;
  position: relative; flex: none; transition: .2s;
}
.switch .track::after {
  content: ""; position: absolute; top: 3px; left: 3px; width: 20px; height: 20px;
  border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0, 0, 0, .2); transition: .2s;
}
.switch input:checked + .track { background: var(--primary); }
.switch input:checked + .track::after { transform: translateX(18px); }
.switch input:focus-visible + .track { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ---- 文本输入 ---- */
.txt {
  width: 100%; margin-top: 12px; padding: 11px 14px; border-radius: 10px;
  border: 1px solid var(--border); font-size: 14px; outline: none; box-sizing: border-box;
  background: var(--card); color: var(--text);
}
.txt:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, .12); }

/* ---- History ---- */
.history { display: grid; gap: 0; max-height: 320px; overflow-y: auto; }
.hrow {
  display: grid; grid-template-columns: 64px 1fr auto; align-items: center; gap: 8px;
  padding: 9px 2px; border-bottom: 1px solid var(--border); font-size: 13px;
}
.hrow:last-child { border-bottom: none; }
.htime { color: var(--muted); font-size: 12px; white-space: nowrap; }
.htext { color: var(--text); word-break: break-all; }
.htext b { color: var(--primary); font-weight: 600; }
.huser { color: var(--primary); font-size: 12px; white-space: nowrap; }

/* ---- Button（实色，hover 仅变色；relative 支撑 loading 旋转） ---- */
.btn {
  width: 100%; margin-top: 16px; padding: 13px; border: none; border-radius: 12px;
  background: var(--primary); color: #fff; position: relative;
  font-size: 16px; font-weight: 600; cursor: pointer; transition: background .15s;
}
.btn:hover { background: var(--primary-d); }
.btn:active { background: var(--primary-d); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn:focus-visible { outline: 2px solid var(--primary-d); outline-offset: 2px; }
.btn.ghost { background: transparent; color: var(--primary); border: 1px solid var(--border); }
.btn.ghost:hover { background: var(--bg2); }
.btn.ghost:disabled { color: var(--text3); border-color: var(--border); }
.btn.loading { color: transparent; pointer-events: none; }
.btn.loading::after {
  content: ""; position: absolute; top: 50%; left: 50%; width: 18px; height: 18px;
  margin: -9px 0 0 -9px; border: 2px solid rgba(255, 255, 255, .5);
  border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Message ---- */
.msg { margin-top: 12px; font-size: 13px; min-height: 18px; line-height: 1.5; }
.msg.info { color: var(--primary); }
.msg.ok { color: var(--ok); }
.msg.warn { color: var(--warn); }
.msg.err { color: var(--no); }

/* ---- Status ---- */
.status { display: grid; gap: 7px; }
.st { display: flex; align-items: center; font-size: 13px; }
.st .dot { width: 9px; height: 9px; border-radius: 50%; margin-right: 9px; flex: none; }
.st.ok .dot { background: var(--ok); }
.st.no .dot { background: var(--no); }

/* ---- Footer ---- */
.ft { text-align: center; color: var(--muted); font-size: 12px; margin: 18px 0; }

/* ---- Toast（实色底，轻阴影） ---- */
.toast-wrap {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: 24px;
  display: flex; flex-direction: column; gap: 10px; z-index: 90;
  width: min(92vw, 420px); pointer-events: none;
}
.toast {
  background: var(--card); color: var(--text); padding: 12px 16px; border-radius: 12px;
  font-size: 14px; border: 1px solid var(--border); box-shadow: 0 4px 16px rgba(16, 24, 40, .10);
  line-height: 1.4; animation: toastIn .25s ease; opacity: 1; transition: opacity .3s, transform .3s;
}
.toast.out { opacity: 0; transform: translateY(8px); }
.toast.ok { border-left: 4px solid var(--ok); }
.toast.err { border-left: 4px solid var(--no); }
.toast.info { border-left: 4px solid var(--info); }
.toast.warn { border-left: 4px solid var(--warn); }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* ---- Modal（实色半透明遮罩，去毛玻璃） ---- */
.modal {
  position: fixed; inset: 0; background: rgba(16, 18, 28, .5);
  display: flex; align-items: center; justify-content: center; z-index: 70; padding: 20px;
}
.modal.hidden { display: none; }
.modal-card {
  background: var(--card); border-radius: 14px; padding: 26px 22px; width: 100%; max-width: 320px; text-align: center;
  border: 1px solid var(--border); box-shadow: 0 8px 30px rgba(0, 0, 0, .18); animation: modalIn .2s ease;
}
@keyframes modalIn { from { opacity: 0; transform: scale(.97); } to { opacity: 1; transform: scale(1); } }
.logo {
  width: 52px; height: 52px; margin: 0 auto 10px; border-radius: 14px;
  background: var(--primary); color: #fff; font-size: 26px;
  display: flex; align-items: center; justify-content: center;
}
.modal-card h2 { margin: 0 0 4px; font-size: 19px; }
.modal-card .sub { color: var(--muted); font-size: 13px; margin: 0 0 16px; }
.modal-card input {
  width: 100%; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border);
  font-size: 15px; text-align: center; margin-bottom: 14px; outline: none;
  background: var(--bg2); color: var(--text);
}
.modal-card input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, .12); }
.hidden { display: none !important; }

/* ---- 无障碍：统一焦点环 ---- */
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }

/* ---- 减弱动效偏好 ---- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}