:root {
  --bg: #f4f8ff;
  --surface: #ffffff;
  --surface-soft: #edf3ff;
  --ink: #17212b;
  --muted: #697783;
  --line: #d8e2f2;
  --teal: #2864f0;
  --teal-dark: #1747bb;
  --teal-soft: #e7efff;
  --amber: #ff7a1a;
  --amber-soft: #fff0e3;
  --green: #00a878;
  --green-soft: #e3fbf2;
  --danger: #b13d4b;
  --shadow: 0 18px 50px rgba(28, 74, 156, 0.1);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: var(--bg); }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
.is-hidden { display: none !important; }

.app-shell { min-height: 100vh; display: flex; }
.sidebar { width: 242px; flex: 0 0 242px; border-right: 1px solid var(--line); background: #ffffff; padding: 28px 18px 22px; display: flex; flex-direction: column; }
.brand-lockup { display: flex; align-items: center; gap: 12px; padding: 0 10px 34px; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; color: white; font-weight: 800; border-radius: 10px; background: linear-gradient(135deg, #2864f0, #7b5cff); box-shadow: 0 8px 18px rgba(40, 100, 240, .25); }
.brand-lockup strong { display: block; font-size: 15px; letter-spacing: .02em; }
.brand-lockup span { display: block; margin-top: 3px; font-size: 11px; color: var(--muted); }
.primary-nav { display: grid; gap: 6px; }
.nav-item { border: 0; background: transparent; color: var(--muted); text-align: left; padding: 12px 13px; border-radius: 7px; display: flex; gap: 11px; align-items: center; font-weight: 600; }
.nav-item:hover { background: var(--surface-soft); color: var(--ink); }
.nav-item.is-active { color: var(--teal-dark); background: var(--teal-soft); }
.nav-icon { width: 19px; text-align: center; font-size: 18px; line-height: 1; }
.sidebar-footer { margin-top: auto; display: grid; gap: 16px; padding: 18px 10px 0; }
.storage-status { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 12px; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #4ca66d; }
.text-button { border: 0; background: transparent; color: var(--muted); padding: 5px 0; text-align: left; font-size: 13px; }
.text-button:hover { color: var(--teal-dark); }
.text-button span { margin-right: 6px; }
.danger-button { color: var(--danger); }

.main-content { min-width: 0; flex: 1; padding: 34px clamp(22px, 4vw, 66px) 60px; }
.topbar, .section-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }
.section-actions { display: flex; gap: 9px; flex-wrap: wrap; }
.eyebrow { color: var(--teal); font-size: 10px; font-weight: 800; letter-spacing: .16em; margin: 0 0 8px; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(25px, 3vw, 34px); letter-spacing: -.02em; }
h2 { margin-bottom: 6px; font-size: 26px; }
.section-heading p:not(.eyebrow) { color: var(--muted); margin-bottom: 0; font-size: 14px; }
.topbar-actions, .period-controls, .filter-controls, .form-actions { display: flex; align-items: center; gap: 9px; }
.topbar-actions { padding-top: 7px; }
.access-status { display: inline-flex; align-items: center; gap: 8px; margin-right: 3px; }
.access-badge { display: inline-flex; align-items: center; min-height: 28px; padding: 0 9px; border: 1px solid #b9ead8; border-radius: 999px; background: var(--green-soft); color: #00845f; font-size: 11px; font-weight: 800; white-space: nowrap; }
.access-button { padding: 3px 0; white-space: nowrap; }
.access-button.is-admin { color: var(--teal-dark); }
.icon-button, .primary-button, .secondary-button { border-radius: 7px; min-height: 38px; border: 1px solid transparent; display: inline-flex; align-items: center; justify-content: center; gap: 7px; white-space: nowrap; }
.icon-button { width: 38px; padding: 0; background: var(--surface); border-color: var(--line); color: var(--muted); font-size: 21px; }
.icon-button:hover { border-color: var(--teal); color: var(--teal-dark); }
.primary-button { background: var(--teal); color: white; padding: 0 15px; font-weight: 700; }
.primary-button:hover { background: var(--teal-dark); }
.secondary-button { background: var(--surface); color: var(--teal-dark); border-color: var(--line); padding: 0 14px; font-weight: 700; }
.secondary-button:hover { border-color: var(--teal); background: var(--teal-soft); }
.view-panel { margin-top: 42px; }
.schedule-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 22px; margin-bottom: 18px; }
.period-label { min-width: 170px; margin-left: 6px; }
.period-label strong, .period-label span { display: block; }
.period-label strong { font-size: 17px; }
.period-label span { color: var(--muted); font-size: 12px; margin-top: 4px; }
.filter-controls { flex-wrap: wrap; justify-content: flex-end; }
.compact-field, .search-field { min-height: 38px; border: 1px solid var(--line); background: var(--surface); border-radius: 7px; display: flex; align-items: center; }
.compact-field { padding: 0 9px; gap: 7px; }
.compact-field span { font-size: 12px; color: var(--muted); }
select, .search-field input { border: 0; outline: 0; background: transparent; color: var(--ink); }
.compact-field select { min-width: 82px; font-size: 13px; }
.search-field { padding: 0 11px; gap: 7px; }
.search-field span { color: var(--muted); font-size: 20px; }
.search-field input { width: 170px; font-size: 13px; }
.notice-strip { display: flex; align-items: center; gap: 9px; background: #edf5ff; color: #2f5cae; border: 1px solid #cfe0ff; border-radius: 7px; padding: 10px 13px; margin-bottom: 18px; font-size: 12px; }
.notice-icon { display: inline-grid; place-items: center; width: 17px; height: 17px; border-radius: 50%; border: 1px solid currentColor; font-size: 11px; font-weight: 800; flex: 0 0 auto; }
.notice-close { margin-left: auto; background: transparent; border: 0; color: inherit; font-size: 18px; }

.schedule-board-wrap { overflow-x: auto; border: 1px solid #cad8ee; background: var(--surface); box-shadow: var(--shadow); }
.schedule-board { min-width: 860px; display: grid; grid-template-columns: 90px repeat(7, minmax(112px, 1fr)); }
.board-cell { min-height: 76px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 10px; }
.board-cell:nth-child(8n) { border-right: 0; }
.board-header { min-height: 75px; background: #edf4ff; padding: 12px 10px; }
.board-header:first-child, .board-header:nth-child(2) { background: #f7faff; }
.board-header strong, .board-header span { display: block; }
.board-header strong { font-size: 15px; }
.board-header span { font-size: 11px; color: var(--muted); margin-top: 5px; }
.board-side { display: flex; align-items: center; justify-content: center; font-weight: 800; background: #fbfdff; }
.board-side.sub { font-size: 12px; color: var(--muted); font-weight: 700; }
.board-side[class*="grade-"] { color: var(--grade-text); background: var(--grade-soft); }
.course-cell { min-height: 112px; padding: 7px; background: #fff; vertical-align: top; }
.course-card { min-height: 58px; border-left: 4px solid var(--teal); padding: 8px 9px; background: #eef4ff; cursor: pointer; transition: transform .16s ease, box-shadow .16s ease, background .16s ease; }
.time-card { min-height: 48px; display: flex; align-items: center; padding: 7px 9px; background: #e6efff; }
.topic-card { min-height: 58px; }
.merged-card { min-height: 100px; padding: 10px 10px 9px; border-left-width: 4px; border-radius: 8px; }
.merged-card .course-time { font-size: 12px; line-height: 1.25; }
.merged-card .time-icon { color: var(--course-text, var(--grade-text, var(--teal-dark))); font-size: 15px; line-height: 1; }
.merged-card .time-separator { color: var(--muted); font-size: 11px; font-weight: 700; margin: 0 2px; }
.merged-card .course-topic { margin-top: 9px; font-size: 13px; line-height: 1.38; }
.course-card:hover { background: #dce9ff; transform: translateY(-1px); box-shadow: 0 5px 12px rgba(30, 76, 160, .14); }
.read-only-board .course-card { cursor: default; }
.read-only-board .course-card:hover { transform: none; box-shadow: none; }
.course-card[class*="grade-"] { border-left-color: var(--course-accent, var(--grade-accent)); background: var(--course-tint, var(--grade-tint)); }
.course-time { display: inline-flex; align-items: center; gap: 5px; color: var(--course-text, var(--grade-text, var(--teal-dark))); font-size: 13px; font-weight: 800; letter-spacing: .02em; }
.course-time span { color: var(--muted); font-size: 10px; font-weight: 600; }
.course-topic { color: var(--ink); font-size: 14px; font-weight: 800; line-height: 1.45; }
.course-note { margin-top: 7px; color: var(--muted); font-size: 11px; line-height: 1.45; padding-top: 6px; border-top: 1px dashed #cbdedc; }
.merged-card .course-note { margin-top: 8px; padding-top: 6px; }
.empty-cell { color: transparent; font-size: 12px; text-align: center; padding-top: 23px; user-select: none; }
.today-column { background: #f8fbfb; }

.directory-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; margin-top: 26px; }
.directory-item { background: var(--surface); border: 1px solid var(--line); padding: 17px; border-radius: 7px; display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.directory-item strong { display: block; }
.directory-item small { display: block; margin-top: 5px; color: var(--muted); }
.setting-preview { color: var(--teal); font-size: 11px; margin-top: 9px; }
.directory-actions { display: flex; gap: 4px; }
.directory-item button { border: 0; background: transparent; color: var(--muted); font-size: 18px; padding: 2px 5px; }
.directory-item button:hover { color: var(--teal-dark); }
.grade-color-panel { margin-top: 28px; padding: 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); box-shadow: 0 10px 28px rgba(28, 74, 156, .07); }
.grade-color-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.grade-color-heading strong { font-size: 15px; }
.grade-color-heading p { margin: 5px 0 0; color: var(--muted); font-size: 12px; }
.grade-color-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.grade-color-item { min-width: 150px; display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 7px; background: #fbfcfd; color: var(--ink); font-size: 13px; font-weight: 700; }
.grade-color-name { display: inline-flex; align-items: center; gap: 8px; }
.grade-color-preview { width: 13px; height: 13px; border-radius: 50%; box-shadow: 0 0 0 3px rgba(255,255,255,.9), 0 0 0 4px var(--line); }
.grade-color-item input[type="color"] { width: 34px; height: 28px; padding: 2px; border: 1px solid var(--line); border-radius: 5px; background: white; cursor: pointer; }
.course-color-field { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 13px; border: 1px solid #cfe0ff; border-radius: 7px; background: #f5f8ff; }
.course-color-field strong, .course-color-field small { display: block; }
.course-color-field strong { color: var(--ink); font-size: 13px; }
.course-color-field small { margin-top: 4px; color: var(--muted); font-size: 11px; }
.course-color-controls { display: flex; align-items: center; gap: 10px; }
.course-color-controls input[type="color"] { width: 42px; height: 34px; padding: 3px; border: 1px solid var(--line); border-radius: 6px; background: #fff; cursor: pointer; }
.import-history { margin-top: 26px; border-top: 1px solid var(--line); }
.history-item { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.history-item strong { display: block; font-size: 14px; }
.history-item span { display: block; margin-top: 4px; color: var(--muted); font-size: 12px; }
.history-badge { color: var(--teal-dark); background: var(--teal-soft); padding: 5px 8px; border-radius: 5px; font-size: 11px; white-space: nowrap; }
.empty-state { padding: 42px 10px; text-align: center; color: var(--muted); }

.modal-backdrop { position: fixed; inset: 0; z-index: 10; background: rgba(20, 31, 39, .38); display: grid; place-items: center; padding: 20px; }
.modal { width: min(100%, 550px); max-height: min(760px, calc(100vh - 40px)); overflow: auto; background: var(--surface); border-radius: 9px; box-shadow: 0 24px 80px rgba(25, 38, 45, .25); padding: 25px; }
.import-modal { width: min(100%, 590px); }
.preview-modal { width: min(100%, 1000px); }
.modal-header { display: flex; justify-content: space-between; gap: 15px; margin-bottom: 24px; }
.modal-header h2 { margin: 0; }
.modal-subtitle { color: var(--muted); font-size: 12px; margin: 8px 0 0; }
.login-modal { width: min(100%, 430px); }
.login-hint { margin: 0; padding: 10px 12px; border: 1px solid #e4eaf0; border-radius: 6px; background: #f7fafc; color: var(--muted); font-size: 12px; line-height: 1.6; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-grid label { display: grid; gap: 7px; color: var(--muted); font-size: 12px; font-weight: 700; }
.form-grid input, .form-grid select, .form-grid textarea { width: 100%; border: 1px solid var(--line); border-radius: 6px; padding: 10px 11px; outline: none; background: #fbfcfd; color: var(--ink); font-weight: 400; }
.form-grid input:focus, .form-grid select:focus, .form-grid textarea:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(20, 125, 123, .1); }
.field-span { grid-column: 1 / -1; }
.field-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.form-actions { grid-column: 1 / -1; justify-content: flex-end; padding-top: 6px; }
.form-actions .danger-button { margin-right: auto; }
.small-button { min-height: 32px; padding: 0 10px; font-size: 12px; }
.setting-heading { display: flex; align-items: center; justify-content: space-between; margin-top: 5px; padding-bottom: 2px; border-bottom: 1px solid var(--line); }
.setting-heading strong { color: var(--ink); font-size: 13px; }
.settings-list { display: grid; gap: 10px; }
.setting-row { display: grid; grid-template-columns: 92px 105px 105px minmax(150px, 1fr) 28px; gap: 8px; align-items: end; padding: 11px; background: #f7fafb; border: 1px solid var(--line); border-radius: 6px; }
.setting-row label { display: grid; gap: 6px; color: var(--muted); font-size: 11px; font-weight: 700; }
.setting-row input, .setting-row select { width: 100%; min-width: 0; border: 1px solid var(--line); border-radius: 5px; padding: 8px; outline: 0; background: white; color: var(--ink); font-size: 12px; font-weight: 400; }
.setting-row input:focus, .setting-row select:focus { border-color: var(--teal); }
.remove-setting { height: 34px; border: 0; background: transparent; color: var(--danger); font-size: 18px; }
.sync-summary { padding: 12px; border: 1px solid #b9ead8; background: var(--green-soft); color: #16745b; font-size: 12px; line-height: 1.6; border-radius: 6px; }
.import-options { display: grid; gap: 10px; }
.import-option { display: grid; grid-template-columns: 42px 1fr 20px; align-items: center; gap: 12px; text-align: left; border: 1px solid var(--line); background: #fbfcfd; padding: 14px; border-radius: 7px; }
.import-option:hover { border-color: var(--teal); background: var(--teal-soft); }
.import-option-icon { width: 36px; height: 36px; display: grid; place-items: center; color: var(--teal-dark); background: var(--teal-soft); border-radius: 6px; font-size: 20px; }
.import-option strong, .import-option small { display: block; }
.import-option strong { font-size: 14px; }
.import-option small { color: var(--muted); font-size: 11px; margin-top: 4px; line-height: 1.5; }
.import-option-arrow { color: var(--muted); font-size: 23px; }
.import-help { display: flex; align-items: flex-start; gap: 8px; color: var(--muted); font-size: 12px; line-height: 1.6; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--line); }
.preview-table-wrap { overflow: auto; border: 1px solid var(--line); }
.preview-table { width: 100%; border-collapse: collapse; min-width: 750px; }
.preview-table th, .preview-table td { border-bottom: 1px solid var(--line); padding: 10px; text-align: left; font-size: 12px; vertical-align: top; }
.preview-table th { background: #f5f8fa; color: var(--muted); font-weight: 700; }
.preview-table tr:last-child td { border-bottom: 0; }
.preview-status { color: #4d8c66; font-weight: 700; }
.preview-status.warn { color: var(--amber); }
.toast-region { position: fixed; right: 24px; bottom: 24px; z-index: 30; display: grid; gap: 8px; }
.toast { min-width: 240px; max-width: 360px; padding: 12px 14px; color: white; background: #1c3037; border-radius: 7px; box-shadow: var(--shadow); font-size: 13px; }
.export-canvas-wrap { position: fixed; left: -100000px; top: 0; width: max-content; padding: 28px; background: #ffffff; }
.export-heading { display: flex; align-items: baseline; gap: 18px; padding: 0 0 18px; color: var(--ink); }
.export-heading strong { font-size: 24px; }
.export-heading span { color: var(--muted); font-size: 13px; }
.mobile-export-wrap { position: fixed; left: -100000px; top: 0; width: 390px; padding: 22px 16px 18px; background: #f5f7fb; color: var(--ink); font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif; }
.mobile-export-heading { padding: 4px 4px 18px; }
.mobile-export-heading strong { display: block; font-size: 24px; line-height: 1.25; }
.mobile-export-heading span { display: block; margin-top: 7px; color: var(--muted); font-size: 13px; }
.mobile-export-days { display: grid; gap: 10px; }
.mobile-export-day { overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: #ffffff; }
.mobile-export-day-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding: 12px 14px; background: #f2f7f8; border-bottom: 1px solid var(--line); }
.mobile-export-day-heading strong { font-size: 16px; }
.mobile-export-day-heading span { color: var(--muted); font-size: 12px; }
.mobile-export-courses { display: grid; gap: 8px; padding: 9px; }
.mobile-export-course { padding: 10px 11px; border-left: 3px solid var(--teal); border-radius: 4px; background: #f1f8f7; }
.mobile-export-course[class*="grade-"] { border-left-color: var(--grade-accent); background: var(--grade-tint); }
.mobile-export-course-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.mobile-export-course-top strong { color: var(--teal-dark); font-size: 13px; }
.mobile-export-course[class*="grade-"] .mobile-export-course-top strong { color: var(--grade-text); }
.mobile-export-course-top span { color: var(--muted); font-size: 11px; font-weight: 700; }
.mobile-export-topic { margin-top: 6px; color: var(--ink); font-size: 14px; font-weight: 800; line-height: 1.45; }
.mobile-export-note { margin-top: 5px; padding-top: 5px; border-top: 1px dashed #cbdedc; color: var(--muted); font-size: 11px; line-height: 1.45; }
.mobile-export-empty { padding: 11px 5px; color: #9aa6ae; font-size: 12px; text-align: center; }
.mobile-export-footer { padding: 15px 4px 2px; color: #9aa6ae; font-size: 10px; text-align: center; }

@media (max-width: 900px) {
  .sidebar { width: 72px; flex-basis: 72px; padding: 20px 10px; }
  .brand-lockup { justify-content: center; padding: 0 0 25px; }
  .brand-lockup > div:last-child, .nav-item { font-size: 0; }
  .nav-item { justify-content: center; padding: 12px 0; }
  .nav-icon { font-size: 18px; }
  .sidebar-footer { padding-left: 0; padding-right: 0; }
  .sidebar-footer > * { justify-content: center; font-size: 0; }
  .sidebar-footer .text-button span { font-size: 18px; margin: 0; }
  .main-content { padding: 28px 22px 50px; }
  .schedule-toolbar { align-items: flex-start; flex-direction: column; }
  .filter-controls { justify-content: flex-start; }
}
@media (max-width: 600px) {
  .topbar, .section-heading { flex-direction: column; }
  .topbar-actions { width: 100%; padding-top: 0; }
  .topbar-actions .secondary-button, .topbar-actions .primary-button { flex: 1; }
  .filter-controls { width: 100%; }
  .compact-field { flex: 1; }
  .search-field { flex: 1 1 100%; }
  .search-field input { width: 100%; }
  .form-grid { grid-template-columns: 1fr; }
  .field-pair { grid-column: 1 / -1; }
  .field-span { grid-column: 1; }
  .form-actions { grid-column: 1; flex-wrap: wrap; }
  .form-actions .danger-button { width: 100%; }
  .modal { padding: 20px; }
  .section-actions { width: 100%; }
  .section-actions button { flex: 1; }
  .setting-row { grid-template-columns: 1fr 1fr; }
  .setting-row .setting-topic { grid-column: 1 / -1; }
  .remove-setting { position: absolute; }
}