/* ============================================================
   數學科成績查詢系統 — styles.css
   ============================================================ */

/* ── Loading 畫面 ── */
.loading-screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: var(--bg, #0a1a30);
  color: var(--text-dim, #7e93b3);
  font-size: 14px;
}
.loading-spinner {
  width: 36px; height: 36px;
  border: 3px solid rgba(148,178,222,0.2);
  border-top-color: var(--accent, #2f6fed);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-msg { color: var(--text-dim, #7e93b3); }

/* ── 登入錯誤訊息 ── */
.login-error {
  display: flex; align-items: center; gap: 8px;
  color: var(--fail, #e2574f);
  font-size: 13px;
  padding: 10px 14px;
  background: var(--fail-bg, rgba(226,87,79,0.12));
  border-radius: var(--r-sm, 9px);
}
.login-form { display: flex; flex-direction: column; gap: 0; }

:root {
  --font-scale: 1;
  --accent: #2f6fed;

  /* 成績色階（紅黃綠） */
  --good: #2faa6a;
  --good-bg: rgba(47, 170, 106, 0.14);
  --warn: #e0982c;
  --warn-bg: rgba(224, 152, 44, 0.15);
  --fail: #e2574f;
  --fail-bg: rgba(226, 87, 79, 0.15);

  /* 評量類型色 */
  --t-a: #3b82c4;  /* 作業 */
  --t-b: #7c5cd6;  /* 小考 */
  --t-c: #2faa6a;  /* 課堂表現 */
  --t-d: #d6862c;  /* 分組活動 */
}

/* ---------- 深色主題（深藍主控台） ---------- */
:root[data-theme="dark"] {
  --bg: #0a1a30;
  --bg-grad: radial-gradient(1200px 700px at 78% -8%, #143057 0%, #0a1a30 55%);
  --surface: #102542;
  --surface-2: #152d4f;
  --surface-hover: #18335a;
  --line: rgba(148, 178, 222, 0.14);
  --line-strong: rgba(148, 178, 222, 0.26);
  --text: #eaf1fb;
  --text-mid: #b6c6de;
  --text-dim: #7e93b3;
  --accent-soft: color-mix(in srgb, var(--accent) 22%, transparent);
  --accent-text: color-mix(in srgb, var(--accent) 40%, white);
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(3, 12, 26, 0.4);
}

/* ---------- 淺色主題（淨白學院） ---------- */
:root[data-theme="light"] {
  --bg: #eef2f8;
  --bg-grad: radial-gradient(1100px 600px at 80% -10%, #e3ebf7 0%, #eef2f8 55%);
  --surface: #ffffff;
  --surface-2: #f6f9fd;
  --surface-hover: #f0f5fb;
  --line: rgba(20, 45, 82, 0.10);
  --line-strong: rgba(20, 45, 82, 0.18);
  --text: #112844;
  --text-mid: #43597a;
  --text-dim: #76889f;
  --accent-soft: color-mix(in srgb, var(--accent) 12%, transparent);
  --accent-text: var(--accent);
  --shadow: 0 1px 2px rgba(20,45,82,.06), 0 10px 30px rgba(20, 45, 82, 0.08);
}

/* ---------- 圓角 ---------- */
:root[data-radius="round"] { --r-lg: 18px; --r-md: 12px; --r-sm: 9px; --r-pill: 999px; }
:root[data-radius="sharp"] { --r-lg: 6px; --r-md: 5px; --r-sm: 4px; --r-pill: 6px; }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Noto Sans TC", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: calc(15px * var(--font-scale));
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
.mono { font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; }

/* ============================================================
   登入畫面
   ============================================================ */
.login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 18px;
  position: relative;
  background: var(--bg-grad);
}
.login-bg {
  position: fixed; inset: 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: .35;
  mask-image: radial-gradient(circle at 50% 30%, #000, transparent 75%);
  pointer-events: none;
}
.login-card {
  position: relative;
  width: min(440px, 100%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  padding: 30px 30px 26px;
}
.brand { display: flex; align-items: center; gap: 13px; margin-bottom: 22px; }
.brand-mark {
  width: 46px; height: 46px; flex-shrink: 0;
  display: grid; place-items: center;
  background: var(--accent);
  color: #fff;
  border-radius: var(--r-md);
  font-size: 26px; font-weight: 700; line-height: 1;
  box-shadow: 0 6px 16px var(--accent-soft);
}
.brand-mark.sm { width: 32px; height: 32px; font-size: 19px; border-radius: var(--r-sm); }
.brand-title { font-size: 19px; font-weight: 700; letter-spacing: .3px; }
.brand-sub { font-size: 12.5px; color: var(--text-dim); margin-top: 2px; }

.login-lead { font-size: 13px; color: var(--text-mid); margin-bottom: 12px; font-weight: 500; }
.role-pick { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.role-card {
  display: flex; align-items: center; gap: 12px;
  text-align: left; cursor: pointer;
  background: var(--surface-2);
  border: 1.5px solid var(--line);
  border-radius: var(--r-md);
  padding: 12px 14px;
  color: var(--text);
  transition: border-color .15s, background .15s;
}
.role-card:hover { border-color: var(--line-strong); }
.role-card.sel { border-color: var(--accent); background: var(--accent-soft); }
.role-ic {
  width: 38px; height: 38px; flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: var(--r-sm);
  background: var(--surface); color: var(--accent-text);
  border: 1px solid var(--line);
}
.role-card.sel .role-ic { background: var(--accent); color: #fff; border-color: var(--accent); }
.role-text { flex: 1; display: flex; flex-direction: column; }
.role-name { font-weight: 600; font-size: 14.5px; }
.role-desc { font-size: 11.5px; color: var(--text-dim); margin-top: 1px; }
.role-radio {
  width: 20px; height: 20px; border-radius: 50%;
  border: 1.5px solid var(--line-strong);
  display: grid; place-items: center; color: #fff; flex-shrink: 0;
}
.role-card.sel .role-radio { background: var(--accent); border-color: var(--accent); }

.login-field { display: block; margin-bottom: 12px; }
.login-flabel {
  display: flex; align-items: center; gap: 5px;
  font-size: 12px; color: var(--text-mid); margin-bottom: 5px; font-weight: 500;
}
.login-foot {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 14px;
}
.demo-hint { font-size: 11px; color: var(--text-dim); }
.link-btn {
  background: none; border: none; cursor: pointer;
  color: var(--accent-text); font-size: 13px; font-weight: 600;
  font-family: inherit; padding: 0;
}
.link-btn:hover { text-decoration: underline; }

/* 忘記密碼 modal */
.modal-overlay {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(5, 14, 28, 0.55);
  backdrop-filter: blur(3px);
  display: grid; place-items: center; padding: 20px;
}
.modal {
  width: min(380px, 100%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  padding: 24px;
}
.modal-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.modal-ic {
  width: 38px; height: 38px; border-radius: var(--r-sm);
  background: var(--accent-soft); color: var(--accent-text);
  display: grid; place-items: center;
}
.modal-head h3 { margin: 0; font-size: 17px; }
.modal-text { font-size: 13px; color: var(--text-mid); margin: 0 0 14px; }
.modal .text-input { margin-bottom: 14px; }
.modal-close {
  display: block; width: 100%; margin-top: 12px;
  background: none; border: none; color: var(--text-dim);
  cursor: pointer; font-size: 13px; font-family: inherit; padding: 6px;
}
.reset-sent { text-align: center; padding: 8px 0 4px; }
.reset-sent p { font-size: 13.5px; color: var(--text-mid); }

/* ============================================================
   App 外殼
   ============================================================ */
.app { min-height: 100vh; background: var(--bg-grad); background-attachment: fixed; }
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 20px;
  padding: 11px 24px;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar-l { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.topbar-title { font-weight: 700; font-size: 15px; letter-spacing: .2px; }
.topnav { display: flex; gap: 4px; margin: 0 auto 0 18px; }
.topnav.mobile { display: none; }
.navbtn {
  display: flex; align-items: center; gap: 7px;
  padding: 8px 14px; border-radius: var(--r-pill);
  background: none; border: none; cursor: pointer;
  color: var(--text-mid); font-family: inherit; font-size: 13.5px; font-weight: 500;
  transition: background .15s, color .15s;
}
.navbtn:hover { background: var(--surface-2); color: var(--text); }
.navbtn.active { background: var(--accent); color: #fff; }
.topbar-r { display: flex; align-items: center; gap: 10px; margin-left: auto; flex-shrink: 0; }
.user-chip { display: flex; align-items: center; gap: 9px; }
.avatar {
  display: grid; place-items: center; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 600; flex-shrink: 0;
}
.user-meta { display: flex; flex-direction: column; line-height: 1.25; }
.user-name { font-size: 13px; font-weight: 600; }
.user-role { font-size: 10.5px; font-weight: 600; }
.role-tag-teacher { color: var(--t-b); }
.role-tag-assistant { color: var(--t-d); }
.role-tag-student { color: var(--accent-text); }

.content {
  max-width: 1080px; margin: 0 auto;
  padding: 26px 24px 60px;
}

/* ============================================================
   頁面與通用
   ============================================================ */
.page { display: flex; flex-direction: column; gap: 18px; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; }
.hello { font-size: 23px; font-weight: 700; letter-spacing: .2px; }
.page-sub { font-size: 13.5px; color: var(--text-dim); margin-top: 3px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  --card-pad: 20px;
}

.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }

/* 統計卡 */
.stat-card { display: flex; flex-direction: column; gap: 8px; }
.stat-top { display: flex; align-items: center; justify-content: space-between; }
.stat-label { font-size: 12.5px; color: var(--text-dim); font-weight: 500; }
.stat-icon {
  width: 28px; height: 28px; border-radius: var(--r-sm);
  display: grid; place-items: center;
  background: var(--surface-2); color: var(--text-mid);
}
.stat-icon.tone-accent { background: var(--accent-soft); color: var(--accent-text); }
.stat-icon.tone-good { background: var(--good-bg); color: var(--good); }
.stat-icon.tone-warn { background: var(--warn-bg); color: var(--warn); }
.stat-icon.tone-fail { background: var(--fail-bg); color: var(--fail); }
.stat-value { font-size: 30px; font-weight: 700; line-height: 1; letter-spacing: .5px; font-variant-numeric: tabular-nums; }
.stat-suffix { font-size: 14px; font-weight: 500; color: var(--text-dim); margin-left: 2px; }
.stat-hint { font-size: 11.5px; color: var(--text-dim); }

/* 區段標題 */
.section-title {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-bottom: 16px;
}
.section-title-l { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 15px; color: var(--text); }
.section-title-l svg { color: var(--accent-text); }
.section-title-r { display: flex; align-items: center; gap: 8px; }

/* 類型徽章 */
.type-badge {
  display: inline-flex; align-items: center;
  font-size: 11.5px; font-weight: 600; padding: 3px 9px;
  border-radius: var(--r-pill); white-space: nowrap;
}
.type-a { color: var(--t-a); background: color-mix(in srgb, var(--t-a) 14%, transparent); }
.type-b { color: var(--t-b); background: color-mix(in srgb, var(--t-b) 14%, transparent); }
.type-c { color: var(--t-c); background: color-mix(in srgb, var(--t-c) 14%, transparent); }
.type-d { color: var(--t-d); background: color-mix(in srgb, var(--t-d) 14%, transparent); }
.type-x { color: var(--text-mid); background: var(--surface-2); }

/* 成績色塊 */
.score-chip {
  display: inline-grid; place-items: center;
  min-width: 44px; padding: 4px 10px;
  border-radius: var(--r-sm); font-weight: 700;
  font-variant-numeric: tabular-nums; font-size: 14.5px;
}
.score-chip.sz-sm { min-width: 38px; padding: 3px 8px; font-size: 13px; }
.lvl-good { color: var(--good); background: var(--good-bg); }
.lvl-warn { color: var(--warn); background: var(--warn-bg); }
.lvl-fail { color: var(--fail); background: var(--fail-bg); }

/* 風險燈號 */
.risk-dot { display: inline-block; border-radius: 50%; flex-shrink: 0; }
.risk-low { color: var(--good); }
.risk-mid { color: var(--warn); }
.risk-high { color: var(--fail); }
.risk-dot.risk-low { background: var(--good); box-shadow: 0 0 0 4px var(--good-bg); }
.risk-dot.risk-mid { background: var(--warn); box-shadow: 0 0 0 4px var(--warn-bg); }
.risk-dot.risk-high { background: var(--fail); box-shadow: 0 0 0 4px var(--fail-bg); }

/* 按鈕 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  font-family: inherit; font-size: 14px; font-weight: 600;
  padding: 10px 18px; border-radius: var(--r-md);
  border: 1px solid transparent; cursor: pointer;
  transition: filter .15s, background .15s, border-color .15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--text-mid); border-color: var(--line-strong); }
.btn-ghost:hover { background: var(--surface-2); color: var(--text); }
.btn-sm { padding: 7px 13px; font-size: 13px; }
.btn-full { width: 100%; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* 篩選 chip */
.chip-row { display: flex; gap: 6px; align-items: center; }
.chip-row.wrap { flex-wrap: wrap; }
.filter-chip {
  font-family: inherit; font-size: 12.5px; font-weight: 500;
  padding: 6px 13px; border-radius: var(--r-pill);
  background: var(--surface-2); border: 1px solid var(--line);
  color: var(--text-mid); cursor: pointer; white-space: nowrap;
  display: inline-flex; align-items: center; gap: 4px;
  transition: all .14s;
}
.filter-chip:hover { border-color: var(--line-strong); color: var(--text); }
.filter-chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.filter-chip.ghost { border-style: dashed; color: var(--accent-text); }

/* ============================================================
   表格
   ============================================================ */
.table { display: flex; flex-direction: column; }
.tr {
  display: grid; align-items: center;
  grid-template-columns: 90px 92px 1fr 76px;
  padding: 11px 8px; gap: 10px;
  border-bottom: 1px solid var(--line);
}
.tr:last-child { border-bottom: none; }
.tr.th {
  font-size: 11.5px; color: var(--text-dim); font-weight: 600;
  text-transform: none; padding: 8px;
  border-bottom: 1px solid var(--line-strong);
}
.tr:not(.th):hover { background: var(--surface-2); border-radius: var(--r-sm); }
.td { font-size: 13.5px; }
.col-score { text-align: right; }
.col-date { color: var(--text-mid); }
.col-title { color: var(--text); }
.cell-stack { display: flex; flex-direction: column; line-height: 1.3; }
.cell-sub { font-size: 11.5px; color: var(--text-dim); }
.empty { padding: 22px 8px; text-align: center; color: var(--text-dim); font-size: 13px; }

.empty-state {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 38px 16px; text-align: center; color: var(--text-dim);
}
.empty-state svg { color: var(--text-dim); opacity: .6; margin-bottom: 4px; }
.empty-state p { margin: 0; font-size: 14px; color: var(--text-mid); font-weight: 500; }
.empty-state span { font-size: 12px; }

/* ============================================================
   AI 風險卡
   ============================================================ */
.risk-card { border: 1px solid var(--line); }
.risk-bg-low { border-left: 4px solid var(--good); }
.risk-bg-mid { border-left: 4px solid var(--warn); }
.risk-bg-high { border-left: 4px solid var(--fail); }
.risk-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.risk-chip {
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
  font-size: 12px; font-weight: 600; color: var(--accent-text);
  background: var(--accent-soft); padding: 5px 11px; border-radius: var(--r-pill);
}
.risk-status { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 15px; }
.risk-body { display: flex; align-items: center; gap: 20px; }
.risk-pred { text-align: center; flex-shrink: 0; padding-right: 20px; border-right: 1px solid var(--line); }
.risk-pred-num { font-size: 38px; font-weight: 800; line-height: 1; }
.risk-pred-num span { font-size: 15px; font-weight: 600; color: var(--text-dim); margin-left: 2px; }
.risk-pred-lbl { font-size: 11.5px; color: var(--text-dim); margin-top: 4px; }
.risk-advice { margin: 0; font-size: 13.5px; color: var(--text-mid); line-height: 1.6; text-wrap: pretty; }

/* ============================================================
   輸入成績
   ============================================================ */
.input-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
.form { display: flex; flex-direction: column; gap: 15px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field-label { font-size: 12.5px; color: var(--text-mid); font-weight: 500; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.text-input {
  font-family: inherit; font-size: 14px; color: var(--text);
  background: var(--surface-2); border: 1.5px solid var(--line);
  border-radius: var(--r-md); padding: 10px 12px; width: 100%;
  transition: border-color .15s;
}
.text-input:focus { outline: none; border-color: var(--accent); }
.text-input::placeholder { color: var(--text-dim); }
.text-input[readonly] { color: var(--text-mid); }

.select-wrap { position: relative; display: flex; align-items: center; }
.select-wrap select {
  appearance: none; -webkit-appearance: none;
  font-family: inherit; font-size: 14px; color: var(--text);
  background: var(--surface-2); border: 1.5px solid var(--line);
  border-radius: var(--r-md); padding: 10px 36px 10px 12px; width: 100%; cursor: pointer;
}
.select-wrap select:focus { outline: none; border-color: var(--accent); }
.select-wrap svg { position: absolute; right: 11px; color: var(--text-dim); pointer-events: none; transform: rotate(90deg); }
.select-wrap.sm select { padding: 8px 32px 8px 12px; font-size: 13px; }

.newtype { display: inline-flex; align-items: center; gap: 4px; }
.newtype input {
  font-family: inherit; font-size: 12.5px; width: 92px;
  background: var(--surface-2); border: 1.5px solid var(--accent);
  border-radius: var(--r-pill); padding: 5px 11px; color: var(--text);
}
.newtype input:focus { outline: none; }
.newtype-ok {
  width: 26px; height: 26px; border-radius: 50%; border: none; cursor: pointer;
  background: var(--accent); color: #fff; display: grid; place-items: center;
}
.count-pill {
  font-size: 12px; font-weight: 600; color: var(--text-mid); white-space: nowrap;
  background: var(--surface-2); padding: 3px 10px; border-radius: var(--r-pill);
}
.col-name { } .col-act { text-align: right; }
.icon-btn {
  width: 32px; height: 32px; border-radius: var(--r-sm);
  border: 1px solid var(--line); background: var(--surface-2);
  color: var(--text-mid); cursor: pointer; display: grid; place-items: center;
  transition: all .14s;
}
.icon-btn:hover { color: var(--text); border-color: var(--line-strong); }
.icon-btn.danger:hover { color: var(--fail); border-color: var(--fail); background: var(--fail-bg); }

/* Toast */
.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%);
  z-index: 60; display: flex; align-items: center; gap: 8px;
  padding: 12px 18px; border-radius: var(--r-pill);
  background: var(--surface); border: 1px solid var(--line-strong);
  box-shadow: var(--shadow); font-size: 13.5px; font-weight: 500;
  animation: toastIn .25s ease;
}
.toast-good { color: var(--good); }
.toast-good svg { color: var(--good); }
.toast-warn { color: var(--warn); }
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 12px); } }

/* ============================================================
   全班成績
   ============================================================ */
.head-filters { display: flex; gap: 10px; }
.class-layout { display: grid; grid-template-columns: 1.5fr 1fr; gap: 16px; align-items: start; }
.roster { display: flex; flex-direction: column; gap: 2px; max-height: 460px; overflow-y: auto; }
.roster-row {
  display: grid; grid-template-columns: 32px 1fr 90px 44px; align-items: center; gap: 12px;
  padding: 9px 8px; border: none; background: none; cursor: pointer;
  border-radius: var(--r-sm); font-family: inherit; text-align: left;
  border-bottom: 1px solid var(--line);
}
.roster-row:hover { background: var(--surface-2); }
.roster-seat { color: var(--text-dim); font-size: 12.5px; }
.roster-name { font-size: 13.5px; color: var(--text); font-weight: 500; }
.roster-bar { height: 7px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.roster-fill { display: block; height: 100%; border-radius: 999px; }
.roster-fill.lvl-good { background: var(--good); }
.roster-fill.lvl-warn { background: var(--warn); }
.roster-fill.lvl-fail { background: var(--fail); }

/* 分佈圖 */
.dist { display: flex; align-items: flex-end; gap: 16px; height: 200px; padding: 8px 12px 0; }
.dist-col { flex: 1; display: flex; flex-direction: column; align-items: center; height: 100%; }
.dist-track { flex: 1; width: 100%; display: flex; align-items: flex-end; }
.dist-fill {
  width: 100%; min-height: 4px; border-radius: var(--r-sm) var(--r-sm) 0 0;
  position: relative; display: flex; justify-content: center; transition: height .4s ease;
}
.dist-fill.lvl-good { background: var(--good); }
.dist-fill.lvl-warn { background: var(--warn); }
.dist-fill.lvl-fail { background: var(--fail); }
.dist-num { position: absolute; top: -22px; font-size: 13px; font-weight: 700; color: var(--text); }
.dist-label { font-size: 12px; color: var(--text-mid); margin-top: 8px; font-weight: 500; }
.legend { display: flex; gap: 16px; justify-content: center; margin-top: 14px; font-size: 11.5px; color: var(--text-dim); }
.legend span { display: inline-flex; align-items: center; gap: 5px; }
.lg { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.lg.lvl-good { background: var(--good); } .lg.lvl-warn { background: var(--warn); } .lg.lvl-fail { background: var(--fail); }

/* ============================================================
   匯入流程
   ============================================================ */
.stepper { display: flex; align-items: center; gap: 8px; padding: 4px 2px; }
.step { display: flex; align-items: center; gap: 9px; }
.step-dot {
  width: 30px; height: 30px; border-radius: 50%; flex-shrink: 0;
  display: grid; place-items: center; font-weight: 700; font-size: 14px;
  background: var(--surface-2); color: var(--text-dim); border: 1.5px solid var(--line);
}
.step.active .step-dot { background: var(--accent); color: #fff; border-color: var(--accent); }
.step.done .step-dot { background: var(--good); color: #fff; border-color: var(--good); }
.step-label { font-size: 13.5px; font-weight: 600; color: var(--text-dim); }
.step.active .step-label, .step.done .step-label { color: var(--text); }
.step-line { flex: 1; height: 2px; background: var(--line); border-radius: 2px; min-width: 24px; }
.step-line.done { background: var(--good); }

.source-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 16px; }
.source-card {
  display: flex; flex-direction: column; align-items: center; gap: 8px; text-align: center;
  padding: 24px 18px; cursor: pointer; font-family: inherit;
  background: var(--surface-2); border: 1.5px solid var(--line); border-radius: var(--r-md);
  color: var(--text); transition: all .15s;
}
.source-card:hover { border-color: var(--line-strong); }
.source-card.sel { border-color: var(--accent); background: var(--accent-soft); }
.source-ic { width: 52px; height: 52px; border-radius: var(--r-md); display: grid; place-items: center; }
.source-ic.file { background: color-mix(in srgb, var(--t-c) 16%, transparent); color: var(--t-c); }
.source-ic.sheet { background: color-mix(in srgb, var(--t-a) 16%, transparent); color: var(--t-a); }
.source-name { font-weight: 600; font-size: 14.5px; }
.source-desc { font-size: 12px; color: var(--text-dim); }

.dropzone {
  display: flex; flex-direction: column; align-items: center; gap: 6px; text-align: center;
  padding: 30px; border: 2px dashed var(--line-strong); border-radius: var(--r-md);
  color: var(--text-dim); margin-bottom: 8px;
}
.dropzone svg { color: var(--accent-text); }
.dz-title { font-size: 13.5px; color: var(--text-mid); font-weight: 500; }
.dz-sub { font-size: 12.5px; }
.sheet-input { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.sheet-ok { display: inline-flex; align-items: center; gap: 5px; font-size: 12.5px; color: var(--good); font-weight: 600; white-space: nowrap; }

.step-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }
.step-actions .btn-ghost { margin-right: auto; }

.mapping { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 16px; }
.map-tag {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12px; font-weight: 500; padding: 5px 11px; border-radius: var(--r-pill);
  background: var(--good-bg); color: var(--good);
}
.preview-summary { display: flex; gap: 8px; }
.ok-pill, .err-pill { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: var(--r-pill); white-space: nowrap; }
.ok-pill { background: var(--good-bg); color: var(--good); }
.err-pill { background: var(--fail-bg); color: var(--fail); }
.preview-table .tr { grid-template-columns: 56px 1fr 78px 1.4fr 76px 64px; }
.col-seat { color: var(--text-dim); }
.row-error { background: var(--fail-bg); border-radius: var(--r-sm); }
.cell-error { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; color: var(--fail); font-weight: 600; }
.warn-note, .confirm-note {
  display: flex; align-items: center; gap: 8px; margin-top: 14px;
  padding: 11px 14px; border-radius: var(--r-md); font-size: 12.5px;
}
.warn-note { background: var(--warn-bg); color: var(--warn); }
.confirm-note { background: var(--accent-soft); color: var(--accent-text); }

.confirm-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.confirm-item {
  display: flex; flex-direction: column; gap: 4px;
  padding: 14px 16px; background: var(--surface-2); border-radius: var(--r-md); border: 1px solid var(--line);
}
.ci-label { font-size: 12px; color: var(--text-dim); }
.ci-value { font-size: 15px; font-weight: 600; }
.ci-value.ok { color: var(--good); }

.import-done { text-align: center; padding: 40px 24px; }
.done-badge {
  width: 70px; height: 70px; border-radius: 50%; margin: 0 auto 16px;
  background: var(--good-bg); color: var(--good); display: grid; place-items: center;
}
.done-badge.sm { width: 48px; height: 48px; margin-bottom: 10px; }
.import-done h2 { margin: 0 0 8px; font-size: 22px; }
.import-done p { margin: 0 0 22px; color: var(--text-mid); font-size: 14px; }
.done-actions { display: flex; justify-content: center; gap: 10px; }

/* ============================================================
   AI 學習分析
   ============================================================ */
.risk-hero { display: flex; gap: 28px; align-items: stretch; padding: 24px; }
.hero-left { flex: 1; display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.hero-status { display: inline-flex; align-items: center; gap: 10px; font-size: 26px; font-weight: 800; }
.hero-advice { margin: 2px 0 6px; font-size: 14px; color: var(--text-mid); line-height: 1.65; text-wrap: pretty; max-width: 52ch; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 16px; font-size: 12.5px; color: var(--text-dim); margin-top: auto; }
.hero-meta b { color: var(--text); font-size: 14px; }
.hero-meta .up { color: var(--good); display: inline-flex; align-items: center; gap: 3px; }
.hero-meta .down { color: var(--fail); display: inline-flex; align-items: center; gap: 3px; }
.hero-gauge {
  flex-shrink: 0; width: 180px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  background: var(--surface-2); border-radius: var(--r-md); padding: 18px;
}
.gauge-num { font-size: 56px; font-weight: 800; line-height: 1; }
.risk-bg-low .gauge-num { color: var(--good); }
.risk-bg-mid .gauge-num { color: var(--warn); }
.risk-bg-high .gauge-num { color: var(--fail); }
.gauge-lbl { font-size: 13px; color: var(--text-mid); margin-top: 6px; font-weight: 500; }
.gauge-pass { font-size: 11.5px; color: var(--text-dim); margin-top: 8px; }

.analysis-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 16px; align-items: start; }
.trend { width: 100%; display: block; }
.trend-baseline { stroke: var(--text-dim); stroke-width: .6; stroke-dasharray: 2 2; opacity: .6; }
.trend-area { fill: var(--accent-soft); }
.trend-stroke { fill: none; stroke: var(--accent); stroke-width: 1.6; }
.trend-dot { fill: var(--accent); stroke: var(--surface); stroke-width: 1; }
.trend-foot { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-dim); margin-top: 8px; }
.trend-foot-mid { color: var(--text-mid); }

.type-bars { display: flex; flex-direction: column; gap: 13px; }
.type-bar-row { display: grid; grid-template-columns: 78px 1fr 44px; align-items: center; gap: 12px; }
.type-bar-track { height: 9px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.type-bar-fill { display: block; height: 100%; border-radius: 999px; transition: width .4s ease; }
.type-bar-fill.lvl-good { background: var(--good); }
.type-bar-fill.lvl-warn { background: var(--warn); }
.type-bar-fill.lvl-fail { background: var(--fail); }
.suggest-note {
  display: flex; align-items: flex-start; gap: 8px; margin-top: 16px;
  padding: 12px 14px; background: var(--accent-soft); color: var(--accent-text);
  border-radius: var(--r-md); font-size: 12.5px; line-height: 1.5;
}
.suggest-note b { color: inherit; }
.disclaimer { display: flex; align-items: center; gap: 6px; justify-content: center; font-size: 11.5px; color: var(--text-dim); }

/* ============================================================
   響應式
   ============================================================ */
@media (max-width: 860px) {
  .topnav:not(.mobile) { display: none; }
  .topnav.mobile {
    display: flex; overflow-x: auto; gap: 4px;
    padding: 8px 16px; background: var(--surface);
    border-bottom: 1px solid var(--line); position: sticky; top: 53px; z-index: 29;
  }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .input-layout, .class-layout, .analysis-grid, .confirm-grid, .source-grid { grid-template-columns: 1fr; }
  .risk-hero { flex-direction: column; gap: 18px; }
  .hero-gauge { width: 100%; }
  .content { padding: 20px 16px 48px; }
  .topbar { padding: 10px 16px; gap: 12px; }
  .topbar-title { display: none; }
}
@media (max-width: 520px) {
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .risk-body { flex-direction: column; align-items: flex-start; gap: 12px; }
  .risk-pred { border-right: none; padding-right: 0; display: flex; align-items: baseline; gap: 10px; }
  .preview-table .tr { grid-template-columns: 44px 1fr 64px; }
  .preview-table .col-title, .preview-table .col-date { display: none; }
  .user-meta { display: none; }
}