:root {
    --bg: #f6f7f4;
    --panel: #ffffff;
    --ink: #24302f;
    --muted: #64706d;
    --line: #dce2dc;
    --brand: #3f7f78;
    --brand-dark: #2e625d;
    --accent: #b86f44;
    --good: #2f7d55;
    --warn: #b7791f;
    --bad: #b94444;
    --shadow: 0 10px 28px rgba(31, 49, 47, 0.08);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--ink);
    line-height: 1.5;
}

a { color: var(--brand-dark); }
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 16px clamp(16px, 4vw, 40px);
    background: #ffffff;
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 10;
}
.brand {
    font-weight: 800;
    color: var(--ink);
    text-decoration: none;
    font-size: 1.2rem;
}
nav { display: flex; gap: 14px; flex-wrap: wrap; }
nav a { text-decoration: none; font-weight: 700; }
.container {
    width: min(1120px, calc(100% - 32px));
    margin: 28px auto 80px;
}
.page-heading { margin-bottom: 22px; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 10px; }
h1 { font-size: clamp(1.8rem, 3vw, 2.6rem); }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; margin-top: 18px; }
.muted, .card-meta { color: var(--muted); }
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}
.card, .form-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.link-card {
    text-decoration: none;
    color: inherit;
    transition: transform 0.15s ease, border-color 0.15s ease;
}
.link-card:hover { transform: translateY(-2px); border-color: var(--brand); }
.stats { margin-bottom: 18px; }
.stat strong { display: block; font-size: 2rem; }
.stat span { color: var(--muted); }
.auth-panel { max-width: 480px; margin: 44px auto; }
.notice {
    border-radius: 8px;
    padding: 12px 14px;
    margin: 0 0 16px;
    background: #eaf4f1;
    border: 1px solid #b7d8d2;
}
.notice.error { background: #fff0f0; border-color: #ecc0c0; color: #7f2525; }
.notice.success { background: #edf8f1; border-color: #b9dec8; color: #1f6b43; }
label { display: block; font-weight: 700; margin-bottom: 12px; }
input, select, textarea {
    display: block;
    width: 100%;
    margin-top: 6px;
    border: 1px solid #cfd8d3;
    border-radius: 8px;
    padding: 10px 12px;
    font: inherit;
    color: var(--ink);
    background: #fff;
}
textarea { resize: vertical; }
button, .button {
    display: inline-block;
    border: 0;
    border-radius: 8px;
    padding: 10px 14px;
    background: var(--brand);
    color: #fff;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
}
button:hover, .button:hover { background: var(--brand-dark); }
.button.secondary { background: #e8ece8; color: var(--ink); }
.success-button { background: var(--good); }
.danger-button, .danger-link { background: var(--bad); color: #fff; }
.danger-button:hover, .danger-link:hover { background: #8f2f2f; }
.danger-card { border-color: #ecc0c0; }
.compact-form {
    margin-top: 16px;
    border-top: 1px solid var(--line);
    padding-top: 16px;
}
.card-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 14px;
}
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 12px;
}
.inline-form {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: end;
}
.inline-form label { flex: 1 1 180px; }
.table-wrap { overflow-x: auto; background: #fff; border-radius: 8px; border: 1px solid var(--line); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px; border-bottom: 1px solid var(--line); }
th { background: #eef2ee; }
.badge {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 3px 8px;
    border-radius: 999px;
    background: #e8ece8;
    color: var(--ink);
    font-size: 0.8rem;
    font-weight: 800;
}
.badge.complete { background: #dff1e7; color: var(--good); }
.badge.in_progress { background: #fff3d8; color: var(--warn); }
.badge.not_started { background: #edf0f2; color: #53606a; }
.badge.correct { background: #dff1e7; color: #236b48; }
.badge.partially_correct { background: #fff3d8; color: #8a5a13; }
.badge.incorrect { background: #fde7e7; color: #9b2f2f; }
.badge.not_marked { background: #edf0f2; color: #53606a; }
.badge.challenge { background: #e7f0ef; color: var(--brand-dark); }
.badge.awaiting_review { background: #fff3d8; color: #8a5a13; }
.badge.reviewed { background: #e7f0ef; color: var(--brand-dark); }
.badge.needs_corrections { background: #fde7e7; color: #9b2f2f; }
.badge.excellent_work { background: #dff1e7; color: #236b48; }
.badge.new_feedback { background: #e7ecfb; color: #2d4f91; }
.swatch, .subject-dot {
    display: inline-block;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 1px solid rgba(0,0,0,0.12);
}
.row-card { display: flex; gap: 10px; align-items: center; }
.row-card a { margin-left: auto; }
.lesson-picker {
    border: 1px solid var(--line);
    border-radius: 8px;
    margin: 16px 0;
    padding: 12px;
}
.lesson-picker legend { font-weight: 800; padding: 0 6px; }
.check-row {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    font-weight: 500;
}
.check-row input {
    width: auto;
    margin-top: 4px;
    flex: 0 0 auto;
}
.sub-label {
    color: var(--muted);
    font-size: 0.92rem;
}
.answer-block {
    border-top: 1px solid var(--line);
    padding: 18px 0;
}
.answer-block:first-of-type { border-top: 0; padding-top: 0; }
.task-block {
    margin-top: 8px;
    padding-bottom: 22px;
}
.task-block h3 { margin-bottom: 12px; }
.student-feedback {
    margin-top: 12px;
    padding: 12px 14px;
    border: 1px solid #d7e4df;
    border-radius: 8px;
    background: #f7fbf9;
}
.student-feedback p {
    margin: 8px 0 0;
}
.feedback-heading {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}
.challenge-card { border-color: #b7d8d2; background: #fbfefd; }
.progress-card { margin-bottom: 16px; }
.progress-bar {
    height: 14px;
    overflow: hidden;
    border-radius: 999px;
    background: #e4eae6;
    border: 1px solid var(--line);
}
.progress-bar span {
    display: block;
    height: 100%;
    background: var(--brand);
    border-radius: inherit;
}
.mark-item {
    border-top: 1px solid var(--line);
    padding: 16px 0;
}
.mark-item:first-of-type { border-top: 0; padding-top: 0; }
.mark-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.answer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin: 12px 0;
}
.lesson-list { display: grid; gap: 14px; }
.lesson-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 14px;
    align-items: center;
    text-decoration: none;
    color: inherit;
}
.lesson-card.upcoming { opacity: 0.86; }
.lesson-card.today { border-color: #a7cbc5; }
.planner-section {
    margin: 34px 0 0;
}
.planner-section > h2 {
    margin-bottom: 16px;
}
.planner-section > .mark-heading {
    margin-bottom: 16px;
}
.planner-link-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin: 26px 0 36px;
    padding: 22px 24px;
}
.planner-link-card p { margin-bottom: 0; }
.planner-card {
    display: grid;
    grid-template-columns: 18px minmax(0, 1fr) 180px;
    gap: 16px;
    align-items: center;
    margin-bottom: 18px;
    padding: 24px;
    box-shadow: 0 8px 22px rgba(31, 49, 47, 0.06);
}
.planner-card .subject-dot { margin-top: 2px; }
.planner-card.today { border-color: #a7cbc5; }
.planner-card.has-new-feedback {
    border-color: #8fa8dd;
    background: #fbfcff;
}
.planner-card-main h3 { margin: 12px 0 12px; }
.planner-card-main p { margin: 8px 0; }
.planner-card-side {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: flex-end;
    justify-content: center;
}
.planner-card-side .badge { justify-content: center; }
.planner-card-side .button { width: 100%; text-align: center; }
.planner-progress-row {
    display: grid;
    grid-template-columns: minmax(120px, 1fr) auto;
    gap: 10px;
    align-items: center;
    max-width: 420px;
    margin-top: 16px;
}
.progress-text {
    color: var(--muted);
    font-weight: 800;
    font-size: 0.9rem;
}
.mini-progress {
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: #e4eae6;
    border: 1px solid var(--line);
}
.mini-progress span {
    display: block;
    height: 100%;
    background: var(--brand);
    border-radius: inherit;
}
.date-heading {
    color: var(--muted);
    margin: 24px 0 12px;
}
.lesson-workspace { display: grid; gap: 16px; }
.resource-list { padding-left: 18px; }
details {
    border-top: 1px solid var(--line);
    padding: 12px 0;
}
summary { cursor: pointer; font-weight: 800; }
.sticky-actions {
    position: sticky;
    bottom: 0;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    background: rgba(246, 247, 244, 0.95);
    border-top: 1px solid var(--line);
    padding: 14px 0;
}
.complete-form { margin-top: 12px; }
.save-status {
    align-self: center;
    color: var(--muted);
    font-weight: 700;
}
.save-status.unsaved { color: var(--warn); }
.print-answer-space { display: none; }
.empty {
    padding: 20px;
    border: 1px dashed #b9c5bf;
    border-radius: 8px;
    color: var(--muted);
    background: #fff;
}

@media print {
    body { background: #fff; color: #000; font-size: 12pt; }
    .site-header, .no-print, .sticky-actions, .complete-form, .student-feedback, button, .button { display: none !important; }
    .container { width: 100%; margin: 0; }
    .card, .form-card {
        box-shadow: none;
        border: 0;
        border-radius: 0;
        padding: 10px 0;
        page-break-inside: avoid;
    }
    textarea, input, select { border: 0; padding: 0; }
    textarea { min-height: 0; }
    .check-row input { display: none; }
    .print-answer-space {
        display: block;
        height: 90px;
        border: 1px solid #999;
        margin-top: 10px;
    }
    a { color: #000; text-decoration: none; }
    .badge { border: 1px solid #777; background: #fff; color: #000; }
}
.back-link { display: inline-block; margin-bottom: 12px; font-weight: 800; }
code { background: #eef2ee; padding: 2px 5px; border-radius: 5px; }

@media (max-width: 640px) {
    .site-header { align-items: flex-start; flex-direction: column; }
    .container { width: min(100% - 22px, 1120px); margin-top: 18px; }
    .lesson-card { grid-template-columns: auto 1fr; }
    .lesson-card .badge { grid-column: 2; justify-self: start; }
    .planner-link-card { align-items: flex-start; flex-direction: column; }
    .planner-card { grid-template-columns: auto 1fr; }
    .planner-card-side {
        grid-column: 2;
        align-items: flex-start;
        flex-direction: row;
        flex-wrap: wrap;
    }
    .planner-card-side .button { width: auto; }
    .planner-progress-row { max-width: none; }
    .inline-form { display: block; }
}