:root {
    --navy: #102a43;
    --navy-soft: #1f3f5b;
    --pink: #f7a8b8;
    --pink-soft: #ffe8ee;
    --white: #ffffff;
    --gray: #f5f7fa;
    --gray-line: #d9e2ec;
    --text: #243b53;
    --muted: #627d98;
    --success: #1f8a70;
    --danger: #b42318;
    --shadow: 0 16px 40px rgba(16, 42, 67, 0.1);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: var(--text);
    background: var(--gray);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
}

a {
    color: var(--navy);
    text-decoration: none;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 16px 6vw;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--gray-line);
    backdrop-filter: blur(12px);
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 8px 12px;
    color: var(--white);
    background: var(--navy);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 0;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 15px;
}

.nav-toggle {
    display: none;
    border: 0;
    background: var(--navy);
    color: var(--white);
    border-radius: 8px;
    padding: 9px 12px;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
    gap: 36px;
    align-items: center;
    padding: 72px 6vw 56px;
    background:
        radial-gradient(circle at 85% 20%, rgba(247, 168, 184, 0.28), transparent 28%),
        linear-gradient(135deg, #ffffff 0%, #eef5fb 100%);
}

.hero h1,
.page-title h1 {
    margin: 0 0 16px;
    color: var(--navy);
    font-size: clamp(32px, 5vw, 58px);
    line-height: 1.05;
    letter-spacing: 0;
}

.hero p,
.page-title p {
    margin: 0 0 24px;
    color: var(--muted);
    font-size: 18px;
}

.hero-panel,
.card,
.form-card,
.table-card {
    background: var(--white);
    border: 1px solid var(--gray-line);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.hero-panel {
    padding: 28px;
}

.hero-panel h2,
.card h3 {
    margin-top: 0;
    color: var(--navy);
}

.button,
button,
input[type="submit"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 10px 16px;
    border: 0;
    border-radius: 8px;
    color: var(--white);
    background: var(--navy);
    font-weight: 700;
    cursor: pointer;
}

.button-secondary {
    color: var(--navy);
    background: var(--pink-soft);
}

.button-small {
    min-height: 36px;
    padding: 8px 12px;
}

.button-danger {
    background: var(--danger);
}

.section {
    padding: 56px 6vw;
}

.section-alt {
    background: var(--white);
}

.section-header {
    max-width: 760px;
    margin-bottom: 24px;
}

.section-header h2,
.page-title h1 {
    color: var(--navy);
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.grid-two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
    padding: 22px;
}

.meta {
    color: var(--muted);
    font-size: 14px;
}

.page-title {
    padding: 42px 6vw 20px;
}

.content {
    padding: 20px 6vw 56px;
}

.page-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.admin-help-text {
    max-width: 980px;
    margin: 0 0 18px;
    padding: 14px 16px;
    color: var(--muted);
    background: var(--white);
    border: 1px solid var(--gray-line);
    border-left: 4px solid var(--pink);
    border-radius: 8px;
    box-shadow: 0 8px 22px rgba(16, 42, 67, 0.06);
}

.admin-overview-panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(260px, 0.4fr);
    gap: 18px;
    align-items: center;
    margin: 22px 0;
    padding: 24px;
    background:
        radial-gradient(circle at 96% 12%, rgba(247, 168, 184, 0.18), transparent 28%),
        var(--white);
    border: 1px solid var(--gray-line);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.admin-overview-panel h2 {
    margin: 8px 0 6px;
    color: var(--navy);
}

.admin-chip-list {
    display: grid;
    gap: 8px;
}

.admin-chip-list span {
    padding: 10px 12px;
    color: var(--navy);
    background: var(--pink-soft);
    border-radius: 999px;
    font-weight: 800;
}

.form-card {
    max-width: 520px;
    margin: 24px auto 56px;
    padding: 24px;
}

.admin-editor-form {
    max-width: 980px;
    align-items: stretch;
}

.admin-fieldset {
    display: grid;
    gap: 14px;
    padding: 18px;
    background: #fbfdff;
    border: 1px solid var(--gray-line);
    border-radius: 8px;
}

.admin-fieldset h3 {
    margin: 0;
    color: var(--navy);
}

.form-grid {
    display: grid;
    gap: 14px;
}

label {
    display: grid;
    gap: 6px;
    color: var(--navy);
    font-weight: 700;
}

input,
select,
textarea {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid var(--gray-line);
    border-radius: 8px;
    color: var(--text);
    background: var(--white);
    font: inherit;
}

input[type="checkbox"] {
    width: auto;
    min-height: 0;
}

textarea {
    min-height: 110px;
    resize: vertical;
}

.table-card {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 720px;
    background: var(--white);
}

th,
td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--gray-line);
    vertical-align: top;
}

th {
    color: var(--navy);
    background: #f8fbfd;
}

.progress {
    height: 10px;
    overflow: hidden;
    background: var(--gray-line);
    border-radius: 999px;
}

.progress span {
    display: block;
    height: 100%;
    background: var(--pink);
}

.lesson-list {
    display: grid;
    gap: 10px;
    padding: 0;
    list-style: none;
}

.lesson-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px;
    background: var(--white);
    border: 1px solid var(--gray-line);
    border-radius: 8px;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 9px;
    border-radius: 999px;
    color: var(--navy);
    background: var(--pink-soft);
    font-size: 13px;
    font-weight: 700;
}

.flash {
    margin: 18px 6vw 0;
    padding: 12px 14px;
    border-radius: 8px;
    background: var(--white);
    border: 1px solid var(--gray-line);
}

.flash-success {
    border-color: rgba(31, 138, 112, 0.35);
    color: var(--success);
}

.flash-error {
    border-color: rgba(180, 35, 24, 0.35);
    color: var(--danger);
}

.site-footer {
    padding: 26px 6vw;
    color: var(--white);
    background: var(--navy);
}

@media (max-width: 840px) {
    .hero,
    .grid,
    .grid-two,
    .admin-overview-panel {
        grid-template-columns: 1fr;
    }

    .site-header {
        align-items: flex-start;
    }

    .nav-toggle {
        display: inline-flex;
    }

    .site-nav {
        display: none;
        position: absolute;
        top: 69px;
        right: 6vw;
        left: 6vw;
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
        background: var(--white);
        border: 1px solid var(--gray-line);
        border-radius: 8px;
        box-shadow: var(--shadow);
    }

    .site-nav.is-open {
        display: flex;
    }
}