/* Selected Falcon palette and shell patterns adapted from hydracrm_retail_new2.
   Independent stylesheet: no CRM assets, Bootstrap bundle, fonts, or external requests. */
:root {
    color-scheme: light;
    --shell-bg: #edf2f9;
    --body-text: #344050;
    --muted: #63758a;
    --primary: #2c7be5;
    --primary-hover: #1f63bb;
    --surface: #fff;
    --surface-soft: #f7f9fc;
    --border: rgba(15, 23, 42, .10);
    --shadow: 0 12px 34px rgba(15, 23, 42, .055);
    --blue-soft: rgba(44, 123, 229, .09);
    --success: #217852;
    --error: #ad3343;
}
html[data-theme='dark'] {
    color-scheme: dark;
    --shell-bg: #0f172a;
    --body-text: #e6edf7;
    --muted: #9fb0c7;
    --primary: #7cb4ff;
    --primary-hover: #a3cbff;
    --surface: #172235;
    --surface-soft: #1b2638;
    --border: rgba(148, 163, 184, .18);
    --shadow: 0 12px 34px rgba(2, 6, 23, .18);
    --blue-soft: rgba(59, 130, 246, .12);
    --success: #80d6b0;
    --error: #ff9ca9;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--shell-bg); color: var(--body-text); font: 15px/1.6 'Segoe UI', Arial, sans-serif; }
body:not(.login-page) { display: flex; flex-direction: column; }
a { color: var(--primary); text-decoration: none; }
button, input { font: inherit; }
button, a, input { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 4px; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(26px, 3vw, 34px); line-height: 1.25; letter-spacing: -.7px; }
h2 { font-size: 22px; line-height: 1.35; letter-spacing: -.4px; }
h3 { font-size: 18px; }
.muted { color: var(--muted); }
.eyebrow, .small-label { font-size: 10px; font-weight: 700; letter-spacing: 1.8px; }
.eyebrow { display: block; margin-bottom: 10px; color: var(--muted); }
.small-label { color: var(--primary); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 20px; min-height: 38px; padding: 8px 15px; border: 1px solid var(--border); border-radius: 7px; font-size: 13px; font-weight: 600; line-height: 1.5; }
.button-primary { background: #2c7be5; color: #fff; border-color: #2c7be5; box-shadow: 0 3px 9px rgba(44, 123, 229, .15); }
.button-primary:hover { background: #1f63bb; border-color: #1f63bb; }
.button-quiet { background: var(--surface); color: var(--body-text); }
.button-quiet:hover { background: var(--surface-soft); }
.theme-toggle { font-size: 21px; width: 36px; padding: 1px; font-weight: 400; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.language-switch { margin: 0; flex-shrink: 0; }
.language-switch fieldset { display: flex; gap: 2px; min-width: 0; margin: 0; padding: 2px; border: 1px solid var(--border); border-radius: 7px; }
.language-switch button { min-width: 32px; min-height: 32px; padding: 4px; border: 0; border-radius: 4px; background: transparent; color: var(--muted); font-size: 11px; font-weight: 700; }
.language-switch button:hover, .language-switch button[aria-pressed='true'] { background: var(--blue-soft); color: var(--primary); }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--body-text); flex-shrink: 0; }
.brand span { display: flex; flex-direction: column; }
.brand strong { font-size: 21px; letter-spacing: -.7px; line-height: 1.2; }
.brand small { font-size: 10px; color: var(--muted); margin-top: 3px; letter-spacing: .3px; }
.topbar { background: var(--surface); border-bottom: 1px solid var(--border); }
.topbar-inner { max-width: 1440px; padding: 20px 32px; margin: 0 auto; display: flex; align-items: center; gap: 32px; }
.main-nav { display: flex; gap: 3px; flex: 1; justify-content: center; }
.main-nav a { padding: 8px 11px; color: var(--muted); font-size: 13px; font-weight: 600; border-radius: 7px; white-space: nowrap; }
.main-nav a:hover, .main-nav a[aria-current='page'] { color: var(--primary); background: var(--blue-soft); }
.account-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.account-actions form { display: flex; margin: 0; }
.role-chip, .status-chip, .soon-chip { display: inline-flex; align-items: center; gap: 7px; font-size: 11px; border: 1px solid var(--border); border-radius: 30px; padding: 5px 11px; white-space: nowrap; }
.role-chip { color: var(--primary); background: var(--blue-soft); border: 0; }
.status-chip { color: var(--success); background: var(--surface); }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--success); }
.soon-chip { color: var(--muted); background: var(--surface-soft); }
.mobile-toggle { display: none; }
.skip-link { position: fixed; top: -100px; left: 15px; padding: 12px 20px; background: var(--surface); z-index: 10; }
.skip-link:focus { top: 10px; }
.workspace { width: min(1200px, calc(100% - 64px)); margin: 38px auto 0; flex: 1; }
.page-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 28px; }
.welcome-card { display: flex; align-items: center; justify-content: space-between; gap: 25px; border: 1px solid var(--border); border-radius: 12px; padding: 36px 40px; background: linear-gradient(110deg, var(--surface) 40%, var(--blue-soft)); box-shadow: var(--shadow); margin-bottom: 38px; }
.welcome-card h2 { margin: 12px 0; font-size: 28px; overflow-wrap: anywhere; }
.welcome-card p { color: var(--muted); margin-bottom: 0; }
.welcome-mark { opacity: .85; margin-right: 25px; transform: rotate(-8deg); flex-shrink: 0; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 17px; }
.section-heading h2 { font-size: 18px; margin: 0; }
.section-heading .muted { font-size: 12px; }
.section-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.section-card { display: flex; flex-direction: column; padding: 23px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); color: var(--body-text); box-shadow: var(--shadow); transition: border-color .15s, transform .15s; }
.section-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.section-card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.section-number { display: grid; place-items: center; width: 37px; height: 37px; border-radius: 10px; background: var(--blue-soft); color: var(--primary); font-size: 13px; font-weight: 700; }
.card-arrow { color: var(--muted); font-size: 20px; }
.section-card h3 { margin-bottom: 8px; }
.section-card p { color: var(--muted); font-size: 13px; margin-bottom: 23px; }
.section-card .soon-chip { margin-top: auto; align-self: flex-start; padding: 3px 8px; font-size: 10px; }
.info-note { display: flex; gap: 12px; align-items: center; margin-top: 28px; color: var(--muted); }
.info-note p { font-size: 13px; margin: 0; }
.info-symbol { display: grid; place-items: center; border: 1px solid var(--border); border-radius: 50%; width: 22px; height: 22px; flex-shrink: 0; font-family: Georgia, serif; font-style: italic; }
.footer { width: min(1200px, calc(100% - 64px)); display: flex; justify-content: space-between; gap: 20px; margin: 46px auto 0; padding: 20px 0; border-top: 1px solid var(--border); color: var(--muted); font-size: 11px; }
.breadcrumb { display: block; font-size: 12px; margin-bottom: 9px; color: var(--muted); }
.breadcrumb span { margin-left: 9px; }
.empty-state { text-align: center; padding: 70px 28px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); }
.empty-symbol { display: inline-grid; place-items: center; padding: 12px; min-width: 64px; height: 64px; margin-bottom: 25px; border-radius: 18px; background: var(--blue-soft); color: var(--primary); font-size: 24px; }
.empty-state h2 { margin-bottom: 13px; }
.empty-state .button { margin-top: 12px; }
.error-workspace { display: grid; align-content: center; max-width: 760px; }
.login-page { display: grid; place-items: center; padding: 40px 24px; background: radial-gradient(ellipse at top left, rgba(44, 123, 229, .10), transparent 60%), var(--shell-bg); }
.login-layout { width: min(960px, 100%); display: grid; grid-template-columns: 1.05fr 1fr; background: var(--surface); border: 1px solid var(--border); border-radius: 18px; overflow: hidden; box-shadow: var(--shadow); }
.login-intro { position: relative; display: flex; flex-direction: column; padding: 36px 40px; min-height: 580px; background: var(--surface-soft); border-right: 1px solid var(--border); overflow: hidden; }
.intro-copy { position: relative; padding-top: 55px; flex: 1; }
.intro-copy h1 { font-size: 34px; margin: 15px 0; }
.intro-copy p { font-size: 14px; color: var(--muted); }
.intro-footnote { font-size: 11px; color: var(--muted); }
.orbit { position: relative; width: 240px; height: 150px; margin: 10px 0 20px; opacity: .7; }
.orbit-ring { position: absolute; width: 205px; height: 80px; border: 1px solid var(--primary); border-radius: 50%; top: 35px; left: 17px; }
.ring-two { transform: rotate(60deg); }.ring-three { transform: rotate(120deg); }
.orbit-core { position: absolute; top: 67px; left: 112px; width: 16px; height: 16px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 10px var(--blue-soft); }
.orbit-dot { position: absolute; width: 7px; height: 7px; border-radius: 50%; background: var(--primary); }
.dot-one { top: 40px; left: 180px; }.dot-two { top: 115px; left: 80px; }
.login-panel { padding: 48px 42px; align-self: center; }
.login-panel-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 28px; }
.login-panel h2 { font-size: 28px; margin-bottom: 10px; }
.login-panel > p { font-size: 13px; }
.login-form { margin-top: 28px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 7px; }
.field input { width: 100%; min-height: 43px; border-radius: 7px; border: 1px solid var(--border); background: var(--surface); color: var(--body-text); padding: 9px 12px; }
.field input:focus { border-color: var(--primary); }
.login-submit { width: 100%; margin-top: 5px; min-height: 44px; justify-content: space-between; }
.login-help { color: var(--muted); font-size: 11px !important; margin-top: 26px; margin-bottom: 0; }
.notice { border: 1px solid var(--border); border-radius: 7px; padding: 10px 12px; font-size: 13px; margin: 20px 0; }
.notice-error { color: var(--error); background: rgba(200, 50, 70, .06); }
.notice-success { color: var(--success); background: rgba(33, 120, 82, .06); }
@media (max-width: 1380px) {
    .topbar-inner { gap: 20px; flex-wrap: wrap; }
    .main-nav { order: 3; flex-basis: 100%; justify-content: flex-start; }
    .account-actions { margin-left: auto; }
    .section-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
    .topbar-inner { padding: 17px 20px; gap: 13px; }
    .brand strong { font-size: 18px; }
    .brand img { width: 32px; height: 32px; }
    .main-nav { flex-wrap: wrap; flex-basis: 100%; }
    .has-menu-toggle .main-nav:not(.is-open) { display: none; }
    .has-menu-toggle .mobile-toggle { display: inline-flex; margin-left: auto; }
    .account-actions { margin-left: 0; }
    .account-actions .role-chip { display: none; }
    .language-switch button { min-width: 44px; min-height: 44px; }
    .workspace { width: calc(100% - 36px); margin-top: 26px; }
    .page-heading { align-items: flex-start; flex-direction: column; gap: 14px; }
    .welcome-card { padding: 26px; margin-bottom: 28px; }
    .welcome-card h2 { font-size: 23px; }
    .welcome-mark { display: none; }
    .section-heading { align-items: flex-start; flex-direction: column; gap: 4px; }
    .section-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
    .section-card { padding: 19px; }
    .footer { width: calc(100% - 36px); }
    .empty-state { padding: 45px 22px; }
    .login-page { padding: 24px 16px; }
    .login-layout { grid-template-columns: 1fr; max-width: 450px; }
    .login-intro { padding: 24px 28px; min-height: auto; border-right: 0; border-bottom: 1px solid var(--border); }
    .intro-copy, .intro-footnote { display: none; }
    .login-panel { padding: 28px; }
    .login-panel-top { margin-bottom: 20px; }
}
@media (max-width: 400px) {
    .section-grid { grid-template-columns: 1fr; }
    .topbar-inner .brand small { display: none; }
    .account-actions { gap: 5px; }
    .topbar-inner .button { padding: 6px 10px; }
    .topbar-inner .theme-toggle { width: 31px; padding: 1px; }
}
@media (prefers-reduced-motion: reduce) { .section-card { transition: none; } }

.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow); }
.edit-form { max-width: 730px; padding: 28px; }
.spaced-panel { margin-top: 28px; }
.detail-card { padding: 26px; margin-bottom: 28px; }
.detail-card h2 { margin: 18px 0 10px; font-size: 17px; }
.detail-card p { margin-bottom: 0; }
.group-summary { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; padding: 21px 24px; margin-bottom: 24px; font-size: 13px; }
.panel > .group-summary { margin-bottom: 0; border-bottom: 1px solid var(--border); }
.filter-bar { display: flex; flex-wrap: wrap; align-items: end; gap: 13px; padding: 20px 24px; border-bottom: 1px solid var(--border); }
.filter-bar .field { margin: 0; min-width: 160px; }
.filter-bar .field:first-child { flex: 1; min-width: 200px; max-width: 420px; }
.field select, .field textarea { width: 100%; border: 1px solid var(--border); border-radius: 7px; background: var(--surface); color: var(--body-text); padding: 9px 12px; font: inherit; }
.field select { min-height: 43px; }.field textarea { resize: vertical; }
.field small, .help-line { display: block; color: var(--muted); font-size: 12px; margin-top: 7px; }
.help-line { margin: 17px 0; }.subtle-link { font-size: 13px; padding-bottom: 10px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.name-grid, .form-grid-thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.detail-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin: 20px 0 0; }
.detail-grid dt { color: var(--muted); font-size: 12px; margin-bottom: 5px; }
.detail-grid dd { margin: 0; overflow-wrap: anywhere; }
.group-details { grid-template-columns: 1fr 2fr; margin: 0; }
.student-count { display: inline-flex; align-items: center; justify-content: center; min-width: 32px; padding: 3px 10px; border-radius: 7px; background: var(--blue-soft); color: var(--primary); font-weight: 700; font-variant-numeric: tabular-nums; }
.lesson-planned { color: var(--primary); background: var(--blue-soft); }
.lesson-completed { color: var(--success); }
.lesson-cancelled { color: var(--error); }
.lesson-self_study { background: var(--surface-soft); color: var(--body-text); }
.cancel-lesson { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }
.form-actions { display: flex; align-items: center; gap: 12px; border-top: 1px solid var(--border); padding-top: 20px; margin-top: 24px; }
.action-row, .table-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.table-actions { gap: 6px 16px; font-size: 12px; }
.table-scroll { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th { color: var(--muted); background: var(--surface-soft); text-align: left; font-weight: 600; font-size: 11px; white-space: nowrap; }
.data-table th, .data-table td { padding: 13px 20px; border-bottom: 1px solid var(--border); }
.data-table td { max-width: 350px; overflow-wrap: anywhere; }
.table-note { display: block; margin-top: 4px; font-size: 11px; }
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table tbody tr:hover { background: var(--surface-soft); }
.data-table .table-empty { text-align: center; color: var(--muted); padding: 40px 24px; }
.pager { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; padding: 17px 24px; border-top: 1px solid var(--border); color: var(--muted); font-size: 12px; }
.period-current { color: var(--success); border-color: currentColor; }
.preserve-lines { white-space: pre-wrap; overflow-wrap: anywhere; }.nowrap { white-space: nowrap; }
.selection-form { padding: 24px; max-width: 820px; }
.choice-list { border: 0; padding: 0; margin: 0 0 22px; }
.choice-list legend { font-weight: 600; font-size: 13px; margin-bottom: 12px; }
.choice-row { display: flex; align-items: center; gap: 13px; border-bottom: 1px solid var(--border); padding: 12px; cursor: pointer; }
.choice-row:hover, .choice-row:has(input:checked) { background: var(--blue-soft); }
.choice-row:has(input:disabled) { color: var(--muted); cursor: default; }
.choice-row input { accent-color: var(--primary); width: 17px; height: 17px; flex-shrink: 0; }
.choice-row small { display: block; color: var(--muted); font-size: 11px; }
.button:disabled { opacity: .55; cursor: not-allowed; }
.notice p { margin-bottom: 6px; }.notice ul { margin: 0; padding-left: 22px; }
@media (max-width: 720px) {
    .edit-form, .selection-form { padding: 20px; }
    .form-grid { grid-template-columns: 1fr; gap: 0; }
    .detail-grid { grid-template-columns: 1fr; gap: 15px; }
    .filter-bar { padding: 17px; }.filter-bar .field:first-child { max-width: none; }
    .data-table th, .data-table td { padding: 11px 14px; }
    .group-summary { padding: 18px; gap: 10px; }
    .pager { padding: 15px 18px; }
}