:root {
  --ink: #132238;
  --muted: #5a6b7d;
  --paper: #f3f7f4;
  --card: #ffffff;
  --line: #d5e0d9;
  --teal: #0f7a6a;
  --teal-deep: #0a554a;
  --coral: #d3543c;
  --gold: #c9972a;
  --ok: #1f8a4c;
  --bad: #c0392b;
  --shadow: 0 18px 50px rgba(19, 34, 56, 0.08);
  --radius: 18px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "ZCOOL XiaoWei", "Noto Sans SC", serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #d8efe8 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #f7e8d2 0%, transparent 45%),
    linear-gradient(180deg, #eef5f1 0%, var(--paper) 40%, #e8f0eb 100%);
}

.hidden { display: none !important; }
.view { min-height: 100vh; }

.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  padding: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.auth-hero .brand {
  font-family: var(--display);
  font-size: 1.4rem;
  letter-spacing: 0.12em;
  color: var(--teal-deep);
  margin: 0 0 1rem;
}
.auth-hero h1 {
  font-family: var(--display);
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  line-height: 1.15;
  margin: 0 0 1rem;
  font-weight: 400;
}
.auth-hero .lead {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 28rem;
  line-height: 1.7;
}

.auth-panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 1.75rem;
  box-shadow: var(--shadow);
}
.tabs { display: flex; gap: 0.5rem; margin-bottom: 1.25rem; }
.tab {
  flex: 1;
  border: 1px solid var(--line);
  background: #f7faf8;
  border-radius: 999px;
  padding: 0.65rem;
  cursor: pointer;
  font: inherit;
  color: var(--muted);
}
.tab.active {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
  font-weight: 700;
}
.auth-form { display: grid; gap: 0.9rem; }
.auth-form label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.92rem;
  color: var(--muted);
}
.auth-form input, select, textarea {
  font: inherit;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem 0.9rem;
  background: #fbfcfb;
  color: var(--ink);
}
.auth-form input:focus, select:focus, textarea:focus {
  outline: 2px solid rgba(15, 122, 106, 0.25);
  border-color: var(--teal);
}
.hint { color: var(--muted); font-size: 0.85rem; margin: 0; }
.msg { min-height: 1.2em; color: var(--coral); margin: 0.75rem 0 0; font-size: 0.9rem; }
.msg.ok { color: var(--ok); }

.btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 12px;
  padding: 0.7rem 1.1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s ease, background .15s ease, color .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary {
  background: linear-gradient(135deg, var(--teal) 0%, var(--teal-deep) 100%);
  border-color: transparent;
  color: #fff;
}
.btn.lg { padding: 0.95rem 1.4rem; font-size: 1.05rem; }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--bad); border-color: #f0c7c2; }
.btn.ok { color: var(--ok); border-color: #b7e0c6; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.7rem 1rem;
  padding-top: calc(0.7rem + env(safe-area-inset-top, 0px));
  background: rgba(243, 247, 244, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 0;
}
.brand-mini {
  font-family: var(--display);
  font-size: 1.2rem;
  color: var(--teal-deep);
  white-space: nowrap;
}
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-drawer {
  display: flex;
  gap: 0.35rem;
  flex: 1;
  flex-wrap: wrap;
  align-items: center;
}
.nav-drawer-title { display: none; }
.nav-btn {
  border: none;
  background: transparent;
  font: inherit;
  color: var(--muted);
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
  text-align: left;
}
.nav-btn.active {
  background: #dff0ea;
  color: var(--teal-deep);
  font-weight: 700;
}
.userbox {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
  flex-shrink: 0;
}
.userbox #user-name {
  max-width: 7rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.9rem;
}
.btn-sm { padding: 0.45rem 0.7rem; font-size: 0.88rem; }

.nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(19, 34, 56, 0.35);
  z-index: 45;
}
.bottom-nav { display: none; }

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.account-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.4rem;
  max-width: 480px;
}
.account-user { margin: 0 0 1rem; color: var(--muted); }

.home-hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}
.home-hero > div:first-child,
.stat-grid, .q-card, .practice-head, .day-cell {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.home-hero > div:first-child { padding: 1.6rem; }
.eyebrow {
  color: var(--teal);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
  margin: 0 0 0.5rem;
}
h2 { font-family: var(--display); font-weight: 400; margin: 0 0 0.5rem; font-size: 2rem; }
.sub { color: var(--muted); line-height: 1.6; margin: 0 0 1.2rem; }
.section-title { font-size: 1.1rem; margin: 0 0 0.8rem; }

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  padding: 1rem;
}
.stat {
  background: #f7fbf9;
  border-radius: 14px;
  padding: 0.9rem;
}
.stat b { display: block; font-size: 1.45rem; margin-top: 0.2rem; }
.stat span { color: var(--muted); font-size: 0.85rem; }

.day-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 0.55rem;
}
.day-cell {
  padding: 0.7rem 0.4rem;
  text-align: center;
  cursor: pointer;
  transition: transform .15s ease;
}
.day-cell:hover { transform: translateY(-2px); }
.day-cell strong { display: block; font-size: 1.05rem; }
.day-cell small { color: var(--muted); }
.day-cell.done { background: #e5f6ec; border-color: #b7e0c6; }
.day-cell.current { outline: 2px solid var(--teal); }

.practice-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.2rem 1.4rem;
  margin-bottom: 1rem;
}
.progress-bar {
  height: 8px;
  background: #dde8e2;
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 1rem;
}
#practice-progress {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--teal), #2aa88f);
  transition: width .25s ease;
}

.q-card {
  padding: 1.25rem 1.4rem;
  margin-bottom: 1rem;
  animation: rise .35s ease both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
.q-top {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.75rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  background: #eef5f1;
  color: var(--muted);
}
.badge.review { background: #fff4de; color: #8a6a16; }
.badge.choice { background: #dff0ea; color: var(--teal-deep); }
.badge.essay { background: #fde8e2; color: #9a3d2c; }
.q-module { color: var(--muted); font-size: 0.85rem; margin: 0 0 0.5rem; }
.q-stem {
  white-space: pre-wrap;
  line-height: 1.75;
  font-size: 1.05rem;
  margin: 0 0 1rem;
}
.options { display: grid; gap: 0.55rem; }
.option {
  text-align: left;
  border: 1px solid var(--line);
  background: #fbfcfb;
  border-radius: 14px;
  padding: 0.85rem 1rem;
  cursor: pointer;
  font: inherit;
  line-height: 1.5;
}
.option:hover:not(:disabled) { border-color: var(--teal); background: #f0faf7; }
.option.correct {
  border-color: var(--ok);
  background: #e8f8ee;
  color: var(--ok);
  font-weight: 700;
}
.option.wrong {
  border-color: var(--bad);
  background: #fdeceb;
  color: var(--bad);
}
.option:disabled { cursor: default; }

.feedback {
  margin-top: 1rem;
  padding: 0.95rem 1rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #f7faf8;
  line-height: 1.65;
  white-space: pre-wrap;
}
.feedback.ok { border-color: #b7e0c6; background: #eefaf3; }
.feedback.bad { border-color: #f0c7c2; background: #fff5f3; }
.actions { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-top: 0.9rem; }
.essay-box textarea {
  width: 100%;
  min-height: 120px;
  resize: vertical;
  margin-bottom: 0.75rem;
}
.empty {
  padding: 2rem;
  text-align: center;
  color: var(--muted);
  background: var(--card);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}

.chart-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.chart-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem 1.25rem;
}
.chart-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}
.chart-card canvas { max-height: 280px; }

.hot-list, .table-wrap, .admin-detail {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem;
  margin-bottom: 1rem;
}
.hot-item, .table-row {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 0.75rem;
  align-items: start;
  padding: 0.7rem 0;
  border-bottom: 1px solid #e8efeA;
}
.hot-item:last-child, .table-row:last-child { border-bottom: none; }
.hot-rank {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: #dff0ea;
  color: var(--teal-deep);
  display: grid; place-items: center;
  font-weight: 700;
}
.hot-meta { color: var(--muted); font-size: 0.85rem; margin-top: 0.2rem; }
.hot-count { font-weight: 700; color: var(--coral); white-space: nowrap; }

.data-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.data-table th, .data-table td {
  text-align: left;
  padding: 0.65rem 0.5rem;
  border-bottom: 1px solid #e8efea;
  vertical-align: top;
}
.data-table th { color: var(--muted); font-weight: 600; }
.data-table tr:hover td { background: #f7fbf9; }
.day-mini {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
  gap: 0.4rem;
  margin: 0.75rem 0 1rem;
}
.day-mini span {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.35rem;
  text-align: center;
  font-size: 0.78rem;
  background: #fbfcfb;
}
.day-mini span.done { background: #e5f6ec; border-color: #b7e0c6; }
.admin-only.hidden { display: none !important; }

/* Desktop: horizontal nav in topbar */
@media (min-width: 901px) {
  .topbar {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
  }
  .nav-drawer {
    position: static;
    transform: none;
    width: auto;
    height: auto;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
    justify-content: center;
    overflow: visible;
  }
  .nav-drawer-title { display: none !important; }
  .bottom-nav { display: none !important; }
  .nav-backdrop { display: none !important; }
}

@media (max-width: 900px) {
  .menu-toggle { display: inline-flex; }

  .nav-backdrop[hidden] { display: none !important; }
  .nav-backdrop { display: block; }

  .nav-drawer {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(82vw, 300px);
    z-index: 50;
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 0.25rem;
    padding: calc(1rem + env(safe-area-inset-top, 0px)) 1rem 1.25rem;
    background: #f7fbf9;
    border-right: 1px solid var(--line);
    box-shadow: 8px 0 30px rgba(19, 34, 56, 0.12);
    transform: translateX(-105%);
    transition: transform .22s ease;
    overflow-y: auto;
  }
  .nav-drawer.open { transform: translateX(0); }
  .nav-drawer-title {
    display: block;
    margin: 0 0 0.75rem;
    font-weight: 700;
    color: var(--teal-deep);
  }
  .nav-drawer .nav-btn {
    width: 100%;
    padding: 0.9rem 1rem;
    border-radius: 14px;
    font-size: 1.02rem;
  }

  .bottom-nav {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 35;
    background: rgba(255, 255, 255, 0.96);
    border-top: 1px solid var(--line);
    padding: 0.35rem 0.25rem calc(0.35rem + env(safe-area-inset-bottom, 0px));
    backdrop-filter: blur(10px);
  }
  .bottom-nav-btn {
    border: none;
    background: transparent;
    font: inherit;
    color: var(--muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    padding: 0.35rem 0.15rem;
    cursor: pointer;
    font-size: 0.7rem;
    line-height: 1.2;
  }
  .bottom-nav-btn .bn-ico {
    font-size: 1.05rem;
    line-height: 1;
  }
  .bottom-nav-btn.active {
    color: var(--teal-deep);
    font-weight: 700;
  }

  main {
    padding: 1rem 0.85rem calc(5.5rem + env(safe-area-inset-bottom, 0px));
  }

  .auth-shell, .home-hero, .chart-grid { grid-template-columns: 1fr; }
  .auth-shell { padding: 1.25rem 1rem 2rem; gap: 1.25rem; }
  .auth-hero h1 { font-size: clamp(2rem, 9vw, 2.8rem); }
  .auth-hero .lead { font-size: 0.95rem; }
  .auth-panel { padding: 1.25rem; border-radius: 22px; }

  .practice-head {
    flex-direction: column;
    padding: 1rem;
  }
  h2 { font-size: 1.55rem; }
  .q-card { padding: 1rem; }
  .q-stem { font-size: 1rem; }
  .option { padding: 0.95rem 0.85rem; font-size: 0.98rem; }
  .q-top { flex-wrap: wrap; }

  .day-grid { grid-template-columns: repeat(auto-fill, minmax(58px, 1fr)); gap: 0.4rem; }
  .stat-grid { grid-template-columns: 1fr 1fr; padding: 0.75rem; }
  .stat b { font-size: 1.25rem; }

  .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; padding: 0.75rem; }
  .data-table { min-width: 560px; }
  .hot-item {
    grid-template-columns: 40px 1fr auto;
    gap: 0.5rem;
  }
  .userbox #user-name { display: none; }
  .btn.lg { width: 100%; }
}

@media (max-width: 420px) {
  .btn-sm { padding: 0.4rem 0.55rem; }
  .bottom-nav-btn span:not(.bn-ico) { font-size: 0.65rem; }
}