/* ===================== 设计变量：纯黑白 ===================== */
:root {
  --bg: #f6f6f6;
  --card: #ffffff;
  --text: #0b0b0b;
  --muted: #8a8a8a;
  --line: #e5e5e5;
  --line-2: #f0f0f0;
  --ink: #0b0b0b;
  --ink-text: #ffffff;
  --hover: rgba(0, 0, 0, .04);
  --chip: #ffffff;
  --chip-line: #dedede;
  --radius: 12px;
  --hour: 48px;
}

html[data-theme="dark"] {
  --bg: #000000;
  --card: #0d0d0d;
  --text: #f2f2f2;
  --muted: #8c8c8c;
  --line: #262626;
  --line-2: #191919;
  --ink: #f2f2f2;
  --ink-text: #000000;
  --hover: rgba(255, 255, 255, .06);
  --chip: #1b1b1b;
  --chip-line: #333333;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

.hidden { display: none !important; }
.muted { color: var(--muted); }
.spacer { flex: 1; }
.err { color: var(--text); font-size: 13px; min-height: 18px; margin: 6px 0 0; font-weight: 600; }

button, input, select, textarea { font: inherit; color: inherit; }

::selection { background: var(--ink); color: var(--ink-text); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 10px;
  border: 3px solid var(--bg);
}
::-webkit-scrollbar-track { background: transparent; }

/* ===================== 顶栏 ===================== */
#app { display: flex; flex-direction: column; height: 100%; }

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
  z-index: 5;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .02em;
  white-space: nowrap;
}

.logo {
  width: 22px; height: 22px; border-radius: 6px;
  background: var(--ink);
  position: relative;
}
.logo::after {
  content: "";
  position: absolute;
  inset: 5px 5px 4px;
  border: 1.5px solid var(--ink-text);
  border-radius: 2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
}

.nav h1 {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  margin: 0 0 0 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tools {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

#search {
  width: 160px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  outline: none;
}
#search:focus { border-color: var(--ink); }

button {
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 8px;
  padding: 7px 12px;
  transition: background .15s, border-color .15s, transform .05s;
  white-space: nowrap;
}
button:hover { background: var(--hover); }
button:active { transform: scale(.985); }
button.primary {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--ink-text);
  font-weight: 600;
}
button.primary:hover { opacity: .88; background: var(--ink); }
button.ghost { background: transparent; border-color: transparent; }
button.ghost:hover { background: var(--hover); }
button.danger { color: var(--text); border-color: var(--line); }
button.danger:hover { background: var(--text); color: var(--card); border-color: var(--text); }
button.icon { width: 32px; height: 32px; padding: 0; font-size: 17px; line-height: 1; display: grid; place-items: center; }
button.block { width: 100%; }

.seg { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.seg button { border: 0; border-radius: 0; padding: 6px 12px; background: transparent; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button.on { background: var(--ink); color: var(--ink-text); font-weight: 600; }
.seg button.on:hover { background: var(--ink); }

/* ===================== 菜单 ===================== */
.menu {
  position: fixed;
  top: 56px; right: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 5px;
  display: flex;
  flex-direction: column;
  min-width: 190px;
  z-index: 20;
  box-shadow: 0 12px 32px rgba(0, 0, 0, .12);
}
html[data-theme="dark"] .menu { box-shadow: 0 12px 32px rgba(0, 0, 0, .8); }
.menu button { border: 0; text-align: left; background: transparent; border-radius: 6px; padding: 9px 10px; }
.menu button:hover { background: var(--hover); }

/* ===================== 主区域 ===================== */
main {
  flex: 1;
  min-height: 0;
  padding: 12px;
  overflow: auto;
  display: flex;
  flex-direction: column;
}

/* ---------- 月视图 ---------- */
.month { flex: 1; min-height: 0; display: flex; flex-direction: column; }

.weekdays {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  padding: 0 0 6px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .12em;
  text-align: center;
}

.month .grid {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  grid-template-rows: repeat(6, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.cell {
  background: var(--card);
  min-width: 0;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  overflow: hidden;
  cursor: pointer;
  transition: background .12s;
}
.cell:hover { background: var(--hover); }
.cell.outside { background: var(--line-2); }
.cell.outside .dnum { opacity: .4; }

.dnum { display: flex; justify-content: flex-end; }
.dnum span {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  width: 22px; height: 22px;
  display: grid; place-items: center;
  border-radius: 50%;
  font-variant-numeric: tabular-nums;
}
.cell.today .dnum span { background: var(--ink); color: var(--ink-text); }

.chips { display: flex; flex-direction: column; gap: 3px; min-height: 0; min-width: 0; overflow: hidden; }

.chip {
  display: flex;
  align-items: center;
  gap: 5px;
  width: 100%;
  border: 1px solid var(--chip-line);
  border-left: 3px solid var(--c, var(--ink));
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 12px;
  line-height: 1.5;
  text-align: left;
  background: var(--chip);
  color: var(--text);
  overflow: hidden;
  white-space: nowrap;
}
.chip:hover { background: var(--hover); }
.chip .t { color: var(--muted); font-variant-numeric: tabular-nums; flex: none; }
.chip .s { overflow: hidden; text-overflow: ellipsis; }

.more { font-size: 11px; color: var(--muted); padding-left: 4px; cursor: pointer; }
.more:hover { color: var(--text); text-decoration: underline; }

/* ---------- 周视图 ---------- */
.week {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.week-head {
  display: grid;
  grid-template-columns: 56px repeat(7, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
.week-head .gutter, .allday .gutter {
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--muted);
  display: grid;
  place-items: center;
}
.wh { padding: 8px 4px; text-align: center; font-size: 11px; color: var(--muted); letter-spacing: .08em; }
.wh b { display: block; font-size: 16px; color: var(--text); font-weight: 600; letter-spacing: 0; font-variant-numeric: tabular-nums; }
.wh.today b {
  color: var(--ink-text);
  background: var(--ink);
  border-radius: 50%;
  width: 26px; height: 26px;
  margin: 2px auto 0;
  display: grid;
  place-items: center;
}

.allday {
  display: grid;
  grid-template-columns: 56px repeat(7, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
  min-height: 30px;
}
.ad-col { padding: 3px; display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.ad-col + .ad-col { border-left: 1px solid var(--line-2); }

.week-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: grid;
  grid-template-columns: 56px repeat(7, minmax(0, 1fr));
}

.hours { display: flex; flex-direction: column; }
.hours div {
  height: var(--hour);
  font-size: 10px;
  color: var(--muted);
  text-align: right;
  padding-right: 8px;
  transform: translateY(-6px);
  font-variant-numeric: tabular-nums;
}

.col {
  position: relative;
  min-width: 0;
  border-left: 1px solid var(--line-2);
  background-image: repeating-linear-gradient(
    to bottom, var(--line-2) 0 1px, transparent 1px var(--hour)
  );
  cursor: pointer;
}
.col:hover { background-color: var(--hover); }

.ev {
  position: absolute;
  left: 3px; right: 3px;
  border: 1px solid var(--chip-line);
  border-left: 3px solid var(--c, var(--ink));
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 12px;
  text-align: left;
  overflow: hidden;
  background: var(--chip);
  color: var(--text);
  z-index: 2;
}
.ev:hover { background: var(--hover); }
.ev b { display: block; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ev span { color: var(--muted); font-size: 10px; font-variant-numeric: tabular-nums; }

/* ---------- 日程列表 ---------- */
.agenda { width: 100%; max-width: 760px; margin: 0 auto; padding-bottom: 40px; }

.ag-day {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 20px 0 8px;
  padding: 0 2px 6px;
  border-bottom: 1px solid var(--line);
}
.ag-day span { font-weight: 700; font-size: 15px; letter-spacing: -.01em; }
.ag-day em {
  font-style: normal;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .1em;
}

.ag-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--c, var(--ink));
  border-radius: 6px;
  padding: 11px 14px;
  margin-bottom: 6px;
}
.ag-item:hover { background: var(--hover); }
.ag-time { color: var(--muted); font-size: 11px; width: 52px; flex: none; font-variant-numeric: tabular-nums; letter-spacing: .04em; }
.ag-title { font-weight: 550; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ag-loc { margin-left: auto; color: var(--muted); font-size: 11px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 40%; }

.empty { flex: 1; display: grid; place-items: center; color: var(--muted); letter-spacing: .05em; }

/* ===================== 弹层 ===================== */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, .72);
  backdrop-filter: blur(6px);
  display: grid;
  place-items: center;
  padding: 16px;
  z-index: 30;
}
html[data-theme="dark"] .overlay { background: rgba(0, 0, 0, .72); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .10);
}
html[data-theme="dark"] .card { box-shadow: 0 24px 60px rgba(0, 0, 0, .9); }

.login-card { width: 320px; display: flex; flex-direction: column; gap: 8px; }
.login-card h2 { margin: 0; font-size: 17px; letter-spacing: -.01em; }
.login-card input {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  outline: none;
}
.login-card input:focus { border-color: var(--ink); }

.modal-card {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 92vh;
  overflow: auto;
}

.title-input {
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  padding: 6px 2px;
  outline: none;
}
.title-input:focus { border-color: var(--ink); }

.check { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 13px; }
.check input { accent-color: var(--ink); }

.row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.row input, .row select, .modal-card > input, .modal-card > textarea {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 8px;
  padding: 8px 10px;
  outline: none;
  min-width: 0;
}
.row input:focus, .row select:focus, .modal-card > input:focus, .modal-card > textarea:focus {
  border-color: var(--ink);
}
.row.times {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 8px;
  align-items: center;
}
.pair { display: grid; grid-template-columns: minmax(0, 1fr) 88px; gap: 6px; min-width: 0; }
.pair input { width: 100%; }
.times.allday .pair { grid-template-columns: minmax(0, 1fr); }
.times.allday input[type="time"] { display: none; }
.arrow { color: var(--muted); text-align: center; }

.colors { display: flex; gap: 8px; }
.swatch {
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 1px solid var(--line);
  padding: 0;
  cursor: pointer;
  background: var(--c);
  transition: transform .1s;
}
.swatch:hover { transform: scale(1.1); }
.swatch.on {
  box-shadow: 0 0 0 2px var(--card), 0 0 0 4px var(--ink);
}

.hint { margin: 0; font-size: 12px; color: var(--muted); min-height: 16px; }
.mini { font-size: 12px; color: var(--muted); }

.modal-card footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

/* ===================== 提示 ===================== */
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translate(-50%, 20px);
  background: var(--ink);
  color: var(--ink-text);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 40;
  max-width: 88vw;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ===================== 窄屏 ===================== */
@media (max-width: 900px) {
  .topbar { gap: 8px; padding: 8px 12px; }
  .brand { font-size: 14px; }
  .nav h1 { font-size: 15px; }
  #search { width: 130px; }
  main { padding: 8px; }
  .chip { font-size: 11px; padding: 1px 4px; }
  .chip .t { display: none; }
  .ag-loc { display: none; }
}

@media (max-width: 700px) {
  .brand { display: none; }
  .nav { flex: 1 1 100%; }
  .nav h1 { margin-left: 4px; }
  .tools { width: 100%; margin-left: 0; gap: 6px; }
  #search { flex: 1 1 auto; width: auto; min-width: 0; }
  .cell { padding: 4px; }
  .dnum span { width: 20px; height: 20px; font-size: 11px; }
  .month .grid { grid-template-rows: repeat(6, minmax(48px, 1fr)); }
}

@media (max-width: 460px) {
  .pair { grid-template-columns: minmax(0, 1fr); }
}