/* ========== 三套主题 ========== */
:root, [data-theme="modern"] {
  --bg: #f5f6fa; --panel: #ffffff; --ink: #1f2430; --muted: #7a8194;
  --accent: #4f46e5; --accent-ink: #fff; --accent-soft: #eef0ff; --border: #e6e8f0;
  --ok: #16a34a; --bad: #dc2626; --radius: 16px; --shadow: 0 6px 24px rgba(31,36,48,.07);
  --font: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --title-font: var(--font); --bg-image: none;
}
[data-theme="ink"] {
  --bg: #f3efe4; --panel: #fbf8f0; --ink: #23201c; --muted: #7b746a;
  --accent: #a8322a; --accent-ink: #fbf8f0; --accent-soft: #efe6d6; --border: #d9d0bd;
  --ok: #4d7a52; --bad: #a8322a; --radius: 4px; --shadow: 0 2px 0 rgba(35,32,28,.08);
  --font: "Songti SC", "Noto Serif SC", "STSong", "SimSun", Georgia, serif;
  --title-font: "STKaiti", "KaiTi", "Kaiti SC", "Songti SC", serif;
  --bg-image:
    radial-gradient(ellipse 60% 30% at 15% 100%, rgba(35,32,28,.20), transparent 70%),
    radial-gradient(ellipse 45% 26% at 45% 100%, rgba(35,32,28,.13), transparent 70%),
    radial-gradient(ellipse 55% 34% at 85% 100%, rgba(35,32,28,.17), transparent 70%),
    radial-gradient(circle 70px at 88% 12%, rgba(168,50,42,.55), transparent 71%),
    radial-gradient(ellipse 50% 18% at 30% 8%, rgba(35,32,28,.05), transparent 70%);
}
[data-theme="study"] {
  --bg: #e9efe6; --panel: #f6f9f3; --ink: #26332b; --muted: #6c7b70;
  --accent: #2f6f4f; --accent-ink: #fff; --accent-soft: #dbe8dc; --border: #cbd8cb;
  --ok: #2f6f4f; --bad: #b4532a; --radius: 8px; --shadow: none;
  --font: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --title-font: var(--font); --bg-image: none;
}
[data-theme="study"] body { font-size: 17px; }

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: var(--font); color: var(--ink); background: var(--bg);
  background-image: var(--bg-image); background-attachment: fixed; background-repeat: no-repeat;
  min-height: 100vh; font-size: 16px; line-height: 1.6;
}
h1, h2, h3 { font-family: var(--title-font); margin: 0 0 .5em; line-height: 1.3; }
h1 { font-size: 1.7rem; } h2 { font-size: 1.3rem; } h3 { font-size: 1.05rem; }
[data-theme="ink"] h1, [data-theme="ink"] h2 { letter-spacing: .12em; }
p { margin: .4em 0; }
.muted { color: var(--muted); } .small { font-size: .85rem; }
.ok { color: var(--ok); } .bad { color: var(--bad); }
a { color: var(--accent); }

/* ========== 布局 ========== */
.topbar {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 10px 24px; background: var(--panel); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-family: var(--title-font); font-size: 1.25rem; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.seal { display: inline-grid; place-items: center; width: 32px; height: 32px; background: var(--accent); color: var(--accent-ink); border-radius: calc(var(--radius) / 2 + 2px); font-size: .95rem; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; }
.nav button { background: none; border: 0; padding: 8px 14px; font: inherit; color: var(--muted); cursor: pointer; border-radius: var(--radius); border-bottom: 2px solid transparent; }
.nav button:hover { color: var(--ink); }
.nav button.on { color: var(--accent); background: var(--accent-soft); font-weight: 600; }
[data-theme="ink"] .nav button.on { background: none; border-bottom-color: var(--accent); border-radius: 0; }
.who { display: flex; align-items: center; gap: 10px; font-size: .9rem; }
main { max-width: 1040px; margin: 0 auto; padding: 24px 20px 80px; }
.proto-tag { position: fixed; right: 12px; bottom: 12px; font-size: .75rem; background: var(--ink); color: var(--bg); padding: 4px 10px; border-radius: 99px; opacity: .7; z-index: 5; }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); margin-bottom: 16px; }
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(2, 1fr); } .g3 { grid-template-columns: repeat(3, 1fr); } .g4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 760px) { .g2, .g3, .g4 { grid-template-columns: repeat(2, 1fr); } .g2.stack { grid-template-columns: 1fr; } main { padding: 16px 12px 80px; } }
.row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.between { justify-content: space-between; }
.center { text-align: center; }

/* ========== 控件 ========== */
.btn { font: inherit; padding: 9px 18px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--panel); color: var(--ink); cursor: pointer; transition: .15s; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.1); color: var(--accent-ink); }
.btn.big { padding: 13px 28px; font-size: 1.05rem; }
.btn.sm { padding: 4px 10px; font-size: .85rem; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.icon-btn { border: 1px solid var(--border); background: var(--panel); border-radius: 50%; width: 34px; height: 34px; cursor: pointer; font-size: 1rem; flex: none; }
.icon-btn:hover { border-color: var(--accent); }
input[type=text], input[type=password], input[type=number], select, textarea {
  font: inherit; padding: 9px 12px; border: 1px solid var(--border); border-radius: calc(var(--radius) / 2 + 2px);
  background: var(--panel); color: var(--ink); width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
textarea { min-height: 180px; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .85rem; }
label.f { display: block; margin-bottom: 12px; } label.f > span { display: block; font-size: .85rem; color: var(--muted); margin-bottom: 4px; }
input[type=range] { width: 100%; accent-color: var(--accent); }
table { width: 100%; border-collapse: collapse; } th, td { text-align: left; padding: 9px 8px; border-bottom: 1px solid var(--border); font-size: .92rem; } th { color: var(--muted); font-weight: 500; }
.pill { display: inline-block; padding: 2px 10px; border-radius: 99px; background: var(--accent-soft); color: var(--accent); font-size: .8rem; }
.tip { background: var(--accent-soft); border-left: 3px solid var(--accent); padding: 10px 14px; border-radius: calc(var(--radius) / 2); font-size: .9rem; margin: 12px 0; }
.switch { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; }
.switch input { width: 18px; height: 18px; accent-color: var(--accent); }

/* ========== 登录 ========== */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.login { width: 100%; max-width: 400px; }
.login h1 { text-align: center; font-size: 2rem; margin-bottom: 4px; }

/* ========== 首页 ========== */
.stat b { display: block; font-size: 2.1rem; font-family: var(--title-font); color: var(--accent); line-height: 1.2; }
.stat span { color: var(--muted); font-size: .88rem; }
.bars { display: flex; align-items: flex-end; gap: 10px; height: 140px; padding-top: 10px; }
.bars > div { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; font-size: .78rem; color: var(--muted); }
.bars i { display: block; width: 70%; max-width: 44px; background: var(--accent); border-radius: calc(var(--radius) / 3) calc(var(--radius) / 3) 0 0; min-height: 2px; opacity: .85; }
.bars .today i { opacity: 1; outline: 2px solid var(--accent-soft); }
.xpbar { height: 10px; background: var(--accent-soft); border-radius: 99px; overflow: hidden; margin: 8px 0 4px; }
.xpbar i { display: block; height: 100%; background: var(--accent); }
.rank { font-size: 2.6rem; line-height: 1; }

/* ========== 勋章 ========== */
.medals { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.medal { border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 10px; text-align: center; background: var(--panel); position: relative; }
.medal .ico { font-size: 2.3rem; line-height: 1.2; }
.medal b { display: block; font-family: var(--title-font); }
.medal small { color: var(--muted); display: block; font-size: .78rem; line-height: 1.35; }
.medal.locked { opacity: .5; } .medal.locked .ico { filter: grayscale(1); }
.medal.got { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.medal .new { position: absolute; top: -8px; right: -6px; background: var(--accent); color: var(--accent-ink); font-size: .7rem; padding: 1px 8px; border-radius: 99px; }

/* ========== 单词卡 ========== */
.wcard { max-width: 640px; margin: 0 auto; }
.wcard .word { font-size: 3rem; font-family: Georgia, "Times New Roman", serif; font-weight: 700; line-height: 1.15; word-break: break-word; }
.wcard .line { display: flex; gap: 10px; align-items: flex-start; padding: 12px 0; border-top: 1px dashed var(--border); }
.wcard .line > div { flex: 1; } .wcard .line small { display: block; color: var(--muted); font-size: .78rem; }
.wcard .en { font-family: Georgia, serif; font-size: 1.1rem; }
.cn-box { margin-top: 12px; padding: 14px; text-align: center; border: 1px dashed var(--accent); border-radius: var(--radius); cursor: pointer; color: var(--accent); }
.cn-box.shown { background: var(--accent-soft); border-style: solid; font-size: 1.3rem; color: var(--ink); cursor: default; }
.progress { height: 6px; background: var(--accent-soft); border-radius: 99px; overflow: hidden; margin-bottom: 16px; }
.progress i { display: block; height: 100%; background: var(--accent); transition: width .2s; }
.opts { display: grid; gap: 10px; margin-top: 14px; }
.opt { text-align: left; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--panel); font: inherit; color: var(--ink); cursor: pointer; }
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt.sel { border-color: var(--accent); background: var(--accent-soft); }
.opt.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 15%, var(--panel)); }
.opt.wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 12%, var(--panel)); }
.passage { white-space: pre-wrap; font-family: Georgia, "Times New Roman", serif; font-size: 1.08rem; line-height: 1.85; }
.qblock { padding: 14px 0; border-top: 1px dashed var(--border); }
.qopts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: 8px; }
@media (max-width: 600px) { .qopts { grid-template-columns: 1fr; } .wcard .word { font-size: 2.2rem; } }
.qopts .opt { padding: 8px 12px; font-size: .95rem; }

/* ========== 打字游戏 ========== */
.arena { position: relative; height: 400px; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: linear-gradient(var(--panel), var(--accent-soft)); }
.arena::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 4px; background: var(--bad); opacity: .6; }
.fall { position: absolute; padding: 4px 12px; border-radius: 99px; background: var(--panel); border: 1px solid var(--ink); font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 1.1rem; white-space: nowrap; text-align: center; line-height: 1.2; }
.fall small { display: block; font-size: .68rem; color: var(--muted); font-family: var(--font); }
.fall.hit-part { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.fall em { color: var(--accent); font-style: normal; font-weight: 700; }
.hud { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 10px; font-size: .95rem; }
.hud b { color: var(--accent); font-size: 1.15rem; }
.type-in { font-family: ui-monospace, Menlo, monospace !important; font-size: 1.3rem !important; text-align: center; margin-top: 10px; }
.type-in.err { outline: 2px solid var(--bad) !important; }
.levels { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
@media (max-width: 760px) { .levels { grid-template-columns: repeat(2, 1fr); } }
.level { cursor: pointer; text-align: center; } .level:hover { border-color: var(--accent); }
.level .ico { font-size: 2rem; }

/* ========== 主题选择 ========== */
.themes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.theme-card { border: 2px solid var(--border); border-radius: 10px; cursor: pointer; overflow: hidden; }
.theme-card.on { border-color: var(--accent); }
.theme-card .pv { height: 90px; padding: 10px; display: flex; flex-direction: column; gap: 6px; justify-content: center; }
.theme-card .pv i { display: block; height: 8px; border-radius: 4px; }
.theme-card .nm { padding: 8px; text-align: center; font-size: .9rem; border-top: 1px solid var(--border); background: var(--panel); }

/* ========== toast ========== */
#toasts { position: fixed; top: 70px; right: 16px; z-index: 99; display: flex; flex-direction: column; gap: 8px; }
.toast { background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 10px; box-shadow: 0 6px 20px rgba(0,0,0,.2); animation: tin .3s; max-width: 320px; font-size: .92rem; }
.toast.medal-t { background: var(--accent); color: var(--accent-ink); font-size: 1rem; }
@keyframes tin { from { transform: translateX(40px); opacity: 0; } }
.spin { display: inline-block; width: 18px; height: 18px; border: 3px solid var(--accent-soft); border-top-color: var(--accent); border-radius: 50%; animation: sp 1s linear infinite; vertical-align: middle; }
@keyframes sp { to { transform: rotate(360deg); } }