:root {
  --ink: #17313a;
  --ink-soft: #52676e;
  --ocean: #143b4a;
  --ocean-2: #245a67;
  --mint: #bfe5dc;
  --mint-light: #eaf6f1;
  --coral: #ef765f;
  --coral-dark: #cf5745;
  --sun: #f4c86a;
  --paper: #fffdf9;
  --canvas: #f3f1ea;
  --line: #d9e0dc;
  --white: #ffffff;
  --danger: #a43f35;
  --danger-bg: #fff0ed;
  --success: #236551;
  --success-bg: #e7f5ee;
  --info: #285c70;
  --info-bg: #e8f3f7;
  --shadow: 0 14px 40px rgba(23, 49, 58, 0.08);
  --radius: 18px;
  --radius-sm: 11px;
  --focus: 0 0 0 4px rgba(239, 118, 95, 0.22);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--canvas);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--canvas); }
body { margin: 0; min-height: 100vh; line-height: 1.5; }
a { color: inherit; text-underline-offset: 3px; }
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible { outline: none; box-shadow: var(--focus); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 10px; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.05; letter-spacing: -0.045em; }
h2 { margin-bottom: 12px; font-size: 1.35rem; line-height: 1.2; letter-spacing: -0.02em; }
h3 { margin-bottom: 8px; font-size: 1rem; }
p { color: var(--ink-soft); }

.public-shell { background: var(--ocean); }
.public-main { min-height: calc(100vh - 68px); display: grid; place-items: center; padding: 52px 5vw; position: relative; overflow: hidden; }
.public-main::before, .public-main::after { content: ""; position: absolute; border-radius: 999px; pointer-events: none; }
.public-main::before { width: 440px; height: 440px; background: var(--ocean-2); left: -230px; top: -180px; opacity: .62; }
.public-main::after { width: 300px; height: 300px; border: 74px solid rgba(191, 229, 220, .12); right: -120px; bottom: -120px; }
.public-main > * { position: relative; z-index: 1; }

.card { background: var(--paper); border: 1px solid rgba(23, 49, 58, .09); border-radius: var(--radius); box-shadow: var(--shadow); }
.eyebrow { margin: 0 0 10px; color: var(--coral-dark); font-size: .75rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.brand-mark { width: 40px; height: 40px; display: inline-grid; place-items: center; flex: 0 0 auto; border-radius: 12px 12px 12px 4px; background: var(--coral); color: var(--white); font-size: 1.2rem; font-weight: 900; box-shadow: 0 8px 20px rgba(239, 118, 95, .25); }
.brand-mark.large { width: 58px; height: 58px; border-radius: 17px 17px 17px 5px; font-size: 1.65rem; }

.auth-layout, .setup-wrap { width: min(1080px, 100%); display: grid; grid-template-columns: 1fr minmax(380px, 460px); gap: clamp(36px, 8vw, 100px); align-items: center; }
.auth-message, .setup-intro { color: var(--white); }
.auth-message h1, .setup-intro h1 { max-width: 650px; margin: 25px 0 22px; font-size: clamp(3rem, 6vw, 5.7rem); }
.setup-intro h1 { font-size: clamp(2.6rem, 5vw, 4.5rem); }
.auth-message p, .setup-intro p { max-width: 580px; color: #d8e7e8; font-size: 1.08rem; }
.auth-message .eyebrow, .setup-intro .eyebrow { margin-top: 24px; color: var(--sun); }
.privacy-pill { display: inline-flex; margin-top: 18px; padding: 9px 14px; border: 1px solid rgba(255,255,255,.2); border-radius: 999px; color: var(--mint); font-size: .84rem; font-weight: 700; }
.auth-card, .form-card { padding: clamp(25px, 4vw, 38px); }
.auth-card { width: 100%; }
.auth-card > p { margin-bottom: 26px; }
.auth-card h2 { font-size: 1.6rem; }
.auth-brand { display: none; }
.feature-list { display: grid; gap: 12px; padding: 0; list-style: none; color: #e4efef; }
.feature-list li { position: relative; padding-left: 28px; }
.feature-list li::before { content: "✓"; position: absolute; left: 0; color: var(--sun); font-weight: 900; }

label { display: grid; gap: 7px; margin-bottom: 18px; color: var(--ink); font-size: .88rem; font-weight: 750; }
label small { color: var(--ink-soft); font-weight: 500; }
input, textarea, select { width: 100%; border: 1px solid #c8d2ce; border-radius: var(--radius-sm); background: var(--white); color: var(--ink); padding: 12px 13px; transition: border-color .18s, box-shadow .18s; }
input:hover, textarea:hover, select:hover { border-color: #9dafaa; }
input:focus, textarea:focus, select:focus { border-color: var(--ocean-2); box-shadow: 0 0 0 3px rgba(36, 90, 103, .13); outline: none; }
textarea { resize: vertical; min-height: 105px; }
input[type="checkbox"] { width: 19px; height: 19px; padding: 0; accent-color: var(--ocean-2); }
.form-divider { height: 1px; margin: 28px 0; background: var(--line); }
.form-help { margin: 18px 0 0; font-size: .78rem; text-align: center; }
.form-actions { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-top: 22px; }
.form-actions > span { max-width: 480px; color: var(--ink-soft); font-size: .78rem; }
.char-count { margin-top: -3px; color: #73858a; font-weight: 500; text-align: right; }
.preline { white-space: pre-line; }

.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 18px; border: 1px solid transparent; border-radius: 11px; cursor: pointer; font-weight: 800; text-decoration: none; transition: transform .15s, background .15s, border-color .15s; }
.button:hover { transform: translateY(-1px); }
.button.primary { background: var(--coral); color: var(--white); box-shadow: 0 8px 18px rgba(239, 118, 95, .22); }
.button.primary:hover { background: var(--coral-dark); }
.button.secondary { background: var(--white); border-color: #b8c7c2; color: var(--ocean); }
.button.secondary:hover { border-color: var(--ocean-2); background: var(--mint-light); }
.button.wide { width: 100%; }
.button:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.link-button { border: 0; background: none; padding: 4px; color: var(--ink-soft); cursor: pointer; font-size: .78rem; }
.tiny-button { border: 1px solid #bdcbc6; border-radius: 8px; background: var(--white); color: var(--ocean); padding: 7px 9px; cursor: pointer; font-size: .76rem; font-weight: 750; white-space: nowrap; }
.tiny-button:hover { background: var(--mint-light); }
.tiny-button.danger { color: var(--danger); }

.notice { width: min(1180px, 100%); margin: 0 auto 18px; padding: 12px 15px; border: 1px solid transparent; border-radius: 11px; font-size: .88rem; }
.public-main > .notice { width: min(1080px, 90vw); position: fixed; z-index: 3; top: 20px; }
.notice-error { background: var(--danger-bg); border-color: #f2bcb3; color: var(--danger); }
.notice-success { background: var(--success-bg); border-color: #b8dfcf; color: var(--success); }
.notice-info { background: var(--info-bg); border-color: #bedde8; color: var(--info); }

.topbar { min-height: 76px; display: grid; grid-template-columns: minmax(230px, .8fr) auto minmax(230px, .8fr); align-items: center; gap: 24px; padding: 10px max(22px, calc((100vw - 1260px) / 2)); background: rgba(255, 253, 249, .96); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; backdrop-filter: blur(12px); }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.brand > span:last-child { display: grid; line-height: 1.1; }
.brand strong { font-size: 1.04rem; }
.brand small { margin-top: 4px; max-width: 180px; overflow: hidden; color: var(--ink-soft); font-size: .68rem; text-overflow: ellipsis; white-space: nowrap; }
.primary-nav { display: flex; align-items: center; justify-content: center; gap: 3px; padding: 4px; border: 1px solid var(--line); border-radius: 13px; background: var(--canvas); }
.primary-nav a { display: inline-flex; align-items: center; gap: 6px; min-height: 38px; padding: 8px 12px; border-radius: 9px; color: var(--ink-soft); font-size: .82rem; font-weight: 750; text-decoration: none; }
.primary-nav a:hover, .primary-nav a.active { background: var(--white); color: var(--ocean); box-shadow: 0 3px 10px rgba(23, 49, 58, .06); }
.nav-badge { min-width: 18px; height: 18px; padding: 0 5px; display: inline-grid; place-items: center; border-radius: 999px; background: var(--coral); color: white; font-size: .64rem; }
.account-menu { display: flex; align-items: center; justify-content: flex-end; gap: 12px; }
.account-menu > a { display: flex; align-items: center; gap: 9px; text-decoration: none; }
.account-menu > a > span:nth-child(2) { display: grid; font-size: .78rem; font-weight: 750; line-height: 1.1; }
.account-menu small { margin-top: 4px; color: var(--ink-soft); font-size: .66rem; font-weight: 500; }
.avatar { width: 38px; height: 38px; display: inline-grid; place-items: center; flex: 0 0 auto; border-radius: 12px; background: var(--ocean); color: var(--white); font-size: .82rem; font-weight: 850; }
.avatar.muted { background: var(--mint-light); color: var(--ocean-2); }
.menu-button { display: none; }

.main-content { width: min(1260px, calc(100% - 40px)); min-height: calc(100vh - 145px); margin: 0 auto; padding: 52px 0 80px; }
.page-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; margin-bottom: 32px; }
.page-heading h1 { margin-bottom: 8px; }
.page-heading p:last-child { margin-bottom: 0; }
.hero-row h1 { font-size: clamp(2.2rem, 4vw, 3.7rem); }

.stat-grid, .overview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 22px; }
.stat-card, .overview-card { min-height: 145px; display: flex; flex-direction: column; padding: 22px; border: 1px solid rgba(23,49,58,.09); border-radius: var(--radius); background: var(--paper); box-shadow: 0 8px 24px rgba(23,49,58,.045); text-decoration: none; }
.stat-card span, .overview-card > span:not(.overview-icon) { color: var(--ink-soft); font-size: .82rem; font-weight: 700; }
.stat-card strong, .overview-card strong { margin-top: auto; font-size: 2.15rem; line-height: 1; letter-spacing: -.04em; }
.overview-card { position: relative; overflow: hidden; }
.overview-card small { margin-top: 9px; color: var(--ink-soft); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.overview-card.accent { background: var(--ocean); color: var(--white); }
.overview-card.accent > span:not(.overview-icon), .overview-card.accent small { color: #cee0e1; }
.overview-card.calm { background: var(--mint-light); }
.overview-icon { position: absolute; right: 18px; top: 16px; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; background: rgba(255,255,255,.6); color: var(--ocean); font-weight: 900; }

.getting-started, .list-card, .table-card, .class-detail { padding: clamp(22px, 3vw, 32px); }
.getting-started { margin-top: 24px; }
.getting-started ol { display: grid; gap: 0; margin: 24px 0 0; padding: 0; list-style: none; }
.getting-started li { display: grid; grid-template-columns: 42px 1fr auto; align-items: center; gap: 16px; padding: 18px 0; border-top: 1px solid var(--line); }
.getting-started li > span { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; background: var(--mint-light); color: var(--ocean-2); font-weight: 850; }
.getting-started li p { margin: 3px 0 0; font-size: .85rem; }
.getting-started li a, .section-heading > a { color: var(--coral-dark); font-size: .8rem; font-weight: 800; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 17px; }
.section-heading h2, .section-heading p { margin-bottom: 0; }
.conversation-list { display: grid; }
.conversation-list > a { min-width: 0; display: grid; grid-template-columns: 42px minmax(0, 1fr) auto auto; align-items: center; gap: 14px; padding: 17px 6px; border-top: 1px solid var(--line); text-decoration: none; transition: background .15s; }
.conversation-list > a:hover { background: var(--mint-light); }
.conversation-list > a.is-unread { background: #fff9ee; }
.conversation-main { min-width: 0; display: grid; }
.conversation-main strong { font-size: .92rem; }
.conversation-main small { margin: 2px 0 5px; color: var(--ink-soft); font-size: .72rem; }
.conversation-main > span { overflow: hidden; color: var(--ink-soft); font-size: .82rem; text-overflow: ellipsis; white-space: nowrap; }
.conversation-main b { color: var(--ink); }
.conversation-list time { color: var(--ink-soft); font-size: .7rem; white-space: nowrap; }
.unread-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--coral); }
.count-badge { min-width: 25px; height: 25px; display: grid; place-items: center; border-radius: 999px; background: var(--coral); color: white; font-size: .72rem; font-weight: 850; }
.empty-inline { min-height: 150px; display: grid; place-items: center; align-content: center; text-align: center; }
.empty-inline span { color: var(--coral); font-size: 1.5rem; }
.empty-inline p { margin: 10px 0 0; }
.empty-state { max-width: 640px; margin: 0 auto; padding: 48px 24px; text-align: center; }
.empty-state.card { margin-top: 10vh; }
.empty-icon { width: 50px; height: 50px; display: grid; place-items: center; margin: 0 auto 17px; border-radius: 16px; background: var(--mint-light); color: var(--ocean-2); font-size: 1.35rem; font-weight: 900; }
.inbox-card { min-height: 330px; }

.thread-heading { margin-bottom: 28px; }
.thread-heading > div { display: flex; align-items: center; gap: 13px; margin-top: 26px; }
.thread-heading h1 { margin: 0; font-size: 1.8rem; }
.thread-heading p { margin: 3px 0 0; font-size: .85rem; }
.back-link { color: var(--ink-soft); font-size: .83rem; font-weight: 750; }
.thread { max-width: 820px; display: grid; gap: 15px; margin: 0 auto 28px; }
.message { max-width: 82%; padding: 18px 20px; border: 1px solid var(--line); border-radius: 18px 18px 18px 5px; background: var(--paper); box-shadow: 0 6px 18px rgba(23,49,58,.05); }
.message.mine { justify-self: end; border: 0; border-radius: 18px 18px 5px 18px; background: var(--ocean); color: var(--white); }
.message-meta { display: flex; justify-content: space-between; gap: 24px; margin-bottom: 10px; font-size: .71rem; }
.message-meta time { color: var(--ink-soft); }
.message.mine .message-meta time, .message.mine > small { color: #bcd0d4; }
.message h2 { margin-bottom: 8px; font-size: .96rem; }
.message p { margin: 0; color: inherit; font-size: .91rem; overflow-wrap: anywhere; }
.message > small { display: block; margin-top: 10px; color: var(--ink-soft); font-size: .68rem; text-align: right; }
.reply-box { max-width: 820px; margin: 0 auto; padding: 24px; }

.compose-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 20px; align-items: start; }
.compose-card { padding: 30px; }
.compose-aside { display: grid; gap: 16px; }
.info-card { padding: 24px; }
.info-card.soft { background: var(--mint-light); }
.info-icon { width: 38px; height: 38px; display: grid; place-items: center; margin-bottom: 18px; border-radius: 12px; background: var(--sun); color: var(--ocean); font-weight: 900; }
.info-card p { margin-bottom: 0; font-size: .84rem; }
.recipient-picker { margin: 0 0 20px; padding: 0; border: 0; }
.recipient-picker legend { margin-bottom: 7px; font-size: .88rem; font-weight: 750; }
.check-row { grid-template-columns: 22px 1fr; align-items: center; gap: 12px; margin: 0; padding: 12px; border: 1px solid var(--line); background: white; cursor: pointer; }
.check-row:first-child { border-radius: 11px 11px 0 0; }
.check-row:last-child { border-radius: 0 0 11px 11px; }
.check-row + .check-row { border-top: 0; }
.check-row.select-all { margin-bottom: 9px; border: 1px solid #9fcabf; border-radius: 11px; background: var(--mint-light); }
.check-row > span { display: grid; }
.check-row small { margin-top: 2px; }
.recipient-list { max-height: 280px; overflow-y: auto; }
.recipient-summary { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; padding: 13px; border: 1px solid var(--line); border-radius: 11px; background: var(--mint-light); }
.recipient-summary > span:last-child { display: grid; }
.recipient-summary small { color: var(--ink-soft); font-size: .7rem; }
.recipient-summary strong { font-size: .9rem; }
.muted-text { color: var(--ink-soft); font-size: .84rem; }

.admin-layout { display: grid; grid-template-columns: 310px minmax(0, 1fr); gap: 20px; align-items: start; }
.sticky-card { position: sticky; top: 98px; }
.responsive-table { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th { padding: 11px 10px; border-bottom: 1px solid var(--line); color: var(--ink-soft); font-size: .68rem; letter-spacing: .07em; text-transform: uppercase; }
td { padding: 15px 10px; border-bottom: 1px solid var(--line); font-size: .82rem; vertical-align: middle; }
td > strong, td > small { display: block; }
td > small { margin-top: 3px; color: var(--ink-soft); font-size: .7rem; }
td code { padding: 3px 6px; border-radius: 5px; background: var(--canvas); font-size: .75rem; }
.status { display: inline-flex; padding: 5px 8px; border-radius: 999px; font-size: .68rem; font-weight: 800; }
.status.active { background: var(--success-bg); color: var(--success); }
.status.inactive { background: var(--danger-bg); color: var(--danger); }
.table-actions { display: flex; gap: 6px; }
.table-actions form { margin: 0; }

.classes-layout { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 20px; align-items: start; }
.form-card.compact { padding: 22px; }
.class-list { display: grid; gap: 8px; margin-top: 15px; }
.class-list > a { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 13px 14px; border: 1px solid var(--line); border-radius: 11px; background: var(--paper); text-decoration: none; }
.class-list > a.active { border-color: var(--ocean-2); background: var(--mint-light); }
.class-list > a.inactive { opacity: .55; }
.class-list > a > span:first-child { display: grid; }
.class-list small { color: var(--ink-soft); font-size: .68rem; }
.class-list > a > span:last-child { color: var(--ink-soft); font-size: .68rem; }
.assignment-form { display: grid; grid-template-columns: 1.3fr 1fr auto auto; align-items: end; gap: 10px; padding: 18px; border-radius: 13px; background: var(--canvas); }
.assignment-form label { margin: 0; }
.inline-check { display: flex; align-items: center; gap: 8px; padding-bottom: 12px; white-space: nowrap; }
.member-list { display: grid; margin-top: 24px; }
.member-row { display: grid; grid-template-columns: 40px 1fr auto; align-items: center; gap: 12px; padding: 13px 4px; border-top: 1px solid var(--line); }
.member-row > span:nth-child(2) { display: grid; }
.member-row small { margin-top: 2px; color: var(--ink-soft); font-size: .72rem; }

.two-column { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 20px; align-items: start; }
.narrow-right .form-card { max-width: 700px; }
.legal-page { width: min(820px, 100%); margin: 20px auto; padding: clamp(26px, 5vw, 54px); }
.legal-page h1 { font-size: clamp(2.3rem, 5vw, 4rem); }
.legal-page h2 { margin-top: 30px; font-size: 1.1rem; }
.legal-page p { line-height: 1.75; }
.legal-page .notice { margin-top: 30px; }

.site-footer { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 18px max(22px, calc((100vw - 1260px) / 2)); border-top: 1px solid rgba(23,49,58,.12); color: var(--ink-soft); font-size: .72rem; }
.public-shell .site-footer { border-color: rgba(255,255,255,.12); background: var(--ocean); color: #abc3c8; }
.site-footer > span:last-child { display: flex; gap: 15px; }

@media (max-width: 980px) {
  .topbar { grid-template-columns: 1fr auto; }
  .menu-button { display: inline-flex; grid-column: 2; grid-row: 1; border: 1px solid var(--line); border-radius: 9px; background: var(--white); padding: 8px 11px; color: var(--ocean); font-size: .78rem; font-weight: 800; }
  .primary-nav { display: none; grid-column: 1 / -1; grid-row: 2; align-items: stretch; flex-direction: column; }
  .primary-nav.open { display: flex; }
  .primary-nav a { justify-content: space-between; }
  .account-menu { grid-column: 1; grid-row: 3; justify-content: flex-start; padding: 8px 0; }
  .primary-nav.open ~ .account-menu { display: flex; }
  .account-menu { display: none; }
  .compose-layout, .admin-layout, .classes-layout, .two-column { grid-template-columns: 1fr; }
  .compose-aside { grid-template-columns: repeat(2, 1fr); }
  .sticky-card { position: static; }
  .assignment-form { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .public-main { padding: 28px 18px; }
  .auth-layout, .setup-wrap { grid-template-columns: 1fr; gap: 22px; }
  .auth-message { text-align: center; }
  .auth-message h1 { margin: 18px 0 14px; font-size: 2.65rem; }
  .auth-message p { font-size: .94rem; }
  .setup-intro { padding-top: 24px; }
  .setup-intro h1 { font-size: 2.5rem; }
  .feature-list { display: none; }
  .stat-grid, .overview-grid { grid-template-columns: 1fr; }
  .overview-card { min-height: 130px; }
  .main-content { width: min(100% - 24px, 1260px); padding: 32px 0 60px; }
  .page-heading { align-items: flex-start; flex-direction: column; }
  .hero-row .button { width: 100%; }
  .getting-started li { grid-template-columns: 38px 1fr; }
  .getting-started li > a { grid-column: 2; }
  .conversation-list > a { grid-template-columns: 40px minmax(0, 1fr) auto; gap: 10px; }
  .conversation-list time { display: none; }
  .unread-dot, .count-badge { grid-column: 3; grid-row: 1; }
  .message { max-width: 94%; }
  .form-actions { align-items: stretch; flex-direction: column; }
  .form-actions .button { width: 100%; }
  .compose-aside { grid-template-columns: 1fr; }
  .assignment-form { grid-template-columns: 1fr; }
  .inline-check { padding-bottom: 0; }
  .table-card { padding: 18px 8px; }
  th, td { padding: 12px 8px; }
  .site-footer { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}