:root {
    --navy: #123a68;
    --navy-dark: #0b294b;
    --teal: #12aeb5;
    --teal-light: #dff7f7;
    --gold: #f7c948;
    --cream: #fffaf0;
    --ink: #17324d;
    --muted: #66788a;
    --line: #dbe5eb;
    --white: #ffffff;
    --danger: #b53b4c;
    --warning: #b77700;
    --success: #26835a;
    --shadow: 0 12px 32px rgba(18, 58, 104, .10);
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; color: var(--ink); background: linear-gradient(180deg, #f4fbfb 0, #fff 340px); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
a { color: var(--navy); }
button, input, textarea, select { font: inherit; }
.site-header { min-height: 74px; padding: 14px max(20px, calc((100% - 1120px)/2)); display: flex; align-items: center; justify-content: space-between; gap: 20px; color: white; background: var(--navy); }
.brand { display: flex; align-items: center; gap: 10px; color: white; text-decoration: none; font-size: 1.25rem; }
.brand-star { display: grid; place-items: center; width: 42px; height: 42px; color: var(--navy); background: var(--gold); border-radius: 50%; font-size: 1.35rem; }
.header-user { display: flex; align-items: center; gap: 14px; font-size: .92rem; }
.header-user form { margin: 0; }
.link-button { padding: 0; border: 0; color: white; background: transparent; text-decoration: underline; cursor: pointer; }
.main-nav { display: flex; gap: 8px; padding: 8px max(20px, calc((100% - 1120px)/2)); overflow-x: auto; background: var(--white); border-bottom: 1px solid var(--line); }
.main-nav a { padding: 9px 12px; white-space: nowrap; text-decoration: none; border-radius: 9px; font-weight: 650; font-size: .9rem; }
.main-nav a:hover { background: var(--teal-light); }
.container { width: min(1120px, calc(100% - 32px)); margin: 38px auto 70px; }
.container.narrow { width: min(680px, calc(100% - 32px)); }
.site-footer { padding: 28px 16px; text-align: center; color: var(--muted); font-size: .9rem; }
.site-footer span { color: var(--gold); }
.card, .hero-card, .message-card, .message-row, .moderation-card, .student-row { background: var(--white); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.card { padding: 26px; }
.hero-card { display: flex; justify-content: space-between; align-items: center; gap: 28px; padding: 38px; background: linear-gradient(135deg, var(--navy), #155b88); color: white; border: 0; }
.hero-card h1 { margin: 5px 0 8px; font-size: clamp(1.8rem, 4vw, 2.65rem); }
.hero-card p { margin: 0; color: #e3f3fa; }
.eyebrow { display: block; color: var(--teal); font-size: .76rem; text-transform: uppercase; letter-spacing: .13em; font-weight: 800; }
.hero-card .eyebrow { color: var(--gold); }
.page-heading { margin: 0 0 24px; }
.page-heading h1 { margin: 5px 0 8px; font-size: clamp(1.8rem, 4vw, 2.45rem); color: var(--navy); }
.page-heading p { max-width: 720px; margin: 0; color: var(--muted); }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 44px; padding: 10px 18px; border: 1px solid transparent; border-radius: 11px; text-decoration: none; font-weight: 750; cursor: pointer; }
.button-primary { background: var(--gold); color: var(--navy-dark); }
.button-secondary { background: var(--teal); color: white; }
.button-success { background: var(--success); color: white; }
.button-warning { background: #fff1c8; color: #754d00; border-color: #f0cf77; }
.button-danger { background: #fff0f2; color: var(--danger); border-color: #efbdc5; }
.button-ghost { color: var(--navy); background: white; border-color: var(--line); }
.button-small { min-height: 36px; padding: 7px 11px; font-size: .82rem; color: var(--navy); background: white; border-color: var(--line); }
.button-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 20px; }
.stat-card { display: flex; flex-direction: column; padding: 24px; text-decoration: none; background: white; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.stat-card strong { color: var(--teal); font-size: 2rem; }
.stat-card span { color: var(--muted); }
.login-logo { margin: 24px auto 30px; text-align: center; }
.login-logo > span { display: grid; place-items: center; width: 74px; height: 74px; margin: 0 auto 12px; color: var(--navy); background: var(--gold); border-radius: 50%; font-size: 2.3rem; box-shadow: var(--shadow); }
.login-logo h1 { margin: 0; color: var(--navy); font-size: 2.25rem; }
.login-logo p { margin: 7px 0; color: var(--muted); }
.login-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; width: min(900px, 100%); margin: auto; }
.login-card { position: relative; overflow: hidden; }
.login-card h2 { margin-top: 5px; color: var(--navy); }
.card-icon { color: var(--gold); font-size: 2rem; }
.secondary-card { background: var(--navy); color: white; border: 0; }
.secondary-card h2, .secondary-card label { color: white; }
.secondary-card input { color: var(--ink); background: white; }
form { display: grid; gap: 16px; }
label { display: grid; gap: 7px; color: var(--ink); font-size: .9rem; font-weight: 700; }
input, textarea, select { width: 100%; padding: 12px 13px; color: var(--ink); background: #fbfdfe; border: 1px solid #becdd6; border-radius: 10px; outline: none; }
input:focus, textarea:focus, select:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(18, 174, 181, .16); }
textarea { resize: vertical; line-height: 1.5; }
small, .muted { color: var(--muted); font-weight: 450; }
.form-card { max-width: 760px; }
.form-card h3 { margin: 14px 0 0; color: var(--navy); }
details.form-card { margin-bottom: 24px; }
details.form-card summary { margin: -4px 0; color: var(--navy); font-weight: 800; cursor: pointer; }
details[open].form-card summary { margin-bottom: 22px; }
.alert { margin: 0 0 18px; padding: 13px 16px; border-radius: 11px; font-weight: 650; }
.alert-success { color: #155f42; background: #e2f7ed; border: 1px solid #a9ddc5; }
.alert-error { color: #8d2635; background: #fff0f2; border: 1px solid #efbdc5; }
.empty-state { padding: 58px 20px; text-align: center; background: white; border: 1px dashed #b9cbd4; border-radius: 18px; }
.empty-state.compact { padding: 35px 18px; }
.empty-state > span { display: block; color: var(--teal); font-size: 2.8rem; }
.empty-state h2 { margin: 8px 0; color: var(--navy); }
.empty-state p { color: var(--muted); }
.message-card { position: relative; max-width: 760px; margin-bottom: 18px; padding: 28px 28px 22px 74px; }
.message-star { position: absolute; left: 24px; top: 25px; color: var(--gold); font-size: 2rem; }
blockquote { margin: 0; color: var(--navy-dark); font-size: 1.08rem; line-height: 1.65; }
.message-card p { margin: 15px 0 0; color: var(--muted); }
.message-row { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 22px; margin-bottom: 14px; }
.message-row h3 { margin: 9px 0 6px; color: var(--navy); }
.message-row p { margin: 0; line-height: 1.5; }
.status { display: inline-block; padding: 5px 9px; border-radius: 999px; font-size: .74rem; font-weight: 800; }
.status-pending { color: #795400; background: #fff2c9; }
.status-approved { color: #176342; background: #dff5e9; }
.status-revision { color: #864f00; background: #ffe5bd; }
.status-rejected { color: #8d2635; background: #ffe3e7; }
.teacher-note { margin-top: 14px; padding: 11px 13px; color: #754d00; background: #fff7db; border-left: 4px solid var(--gold); border-radius: 7px; }
.moderation-card { max-width: 850px; margin-bottom: 20px; padding: 26px; }
.moderation-meta { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 18px; color: var(--muted); font-size: .85rem; font-weight: 700; }
.moderation-card blockquote { padding: 18px; background: var(--teal-light); border-radius: 12px; }
.moderation-form { margin-top: 18px; }
.group-layout { display: grid; grid-template-columns: 310px 1fr; gap: 22px; align-items: start; }
.group-list { display: grid; gap: 8px; }
.group-item { display: grid; gap: 4px; padding: 15px; color: var(--ink); background: white; border: 1px solid var(--line); border-radius: 12px; text-decoration: none; }
.group-item.active { color: white; background: var(--navy); border-color: var(--navy); }
.group-item span { color: var(--muted); font-size: .8rem; }
.group-item.active span { color: #cfe4f1; }
.inline-form { grid-template-columns: 1fr auto; align-items: end; margin-top: 20px; }
.student-list { display: grid; gap: 10px; margin-top: 14px; }
.student-row { display: flex; justify-content: space-between; align-items: center; gap: 18px; padding: 15px 18px; box-shadow: none; }
.student-row form { display: block; }
.student-row.inactive { opacity: .55; }
code { padding: 4px 7px; color: var(--navy); background: var(--teal-light); border-radius: 6px; }
.install-page { padding-top: 18px; }
@media (max-width: 760px) {
    .container { margin-top: 24px; }
    .login-grid, .group-layout { grid-template-columns: 1fr; }
    .hero-card, .message-row, .student-row { align-items: stretch; flex-direction: column; }
    .hero-card { padding: 27px 24px; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .moderation-meta { flex-direction: column; }
    .inline-form { grid-template-columns: 1fr; }
    .header-user > span { display: none; }
}
@media (max-width: 440px) {
    .container { width: min(100% - 22px, 1120px); }
    .stats-grid { grid-template-columns: 1fr; }
    .card, .moderation-card { padding: 20px; }
    .message-card { padding: 65px 20px 20px; }
    .message-star { left: 20px; top: 18px; }
}