:root {
    --ink: #202426;
    --muted: #666f72;
    --line: #d8e0e2;
    --surface: #ffffff;
    --soft: #f3f6f5;
    --accent: #b51f2f;
    --accent-dark: #861824;
    --dark: #25292b;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: var(--ink);
    background: #f6f8f8;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.55;
}

a {
    color: var(--accent);
    font-weight: 700;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(280px, 0.92fr);
    gap: 36px;
    align-items: center;
    min-height: 430px;
    padding: 58px clamp(20px, 5vw, 72px);
    background: linear-gradient(120deg, var(--dark) 0%, #40484b 100%);
    color: #ffffff;
    border-bottom: 8px solid var(--accent);
}

.hero__content {
    max-width: 820px;
}

.hero h1 {
    margin: 0;
    font-size: clamp(38px, 6vw, 74px);
    font-weight: 800;
    line-height: 1.04;
    letter-spacing: 0;
}

.eyebrow {
    display: inline-block;
    margin: 0 0 16px;
    padding: 6px 10px;
    background: var(--accent);
    color: #ffffff;
    font-size: 0.82rem;
    font-weight: 800;
    text-transform: uppercase;
}

.hero__image,
.partner-card__image {
    display: grid;
    place-items: center;
    min-height: 270px;
    background: #e8eeee;
    border: 1px solid #c6d0d2;
    color: var(--muted);
    font-weight: 700;
}

.hero__image {
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.18);
}

.hero__image span,
.partner-card__image span {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid #c6d0d2;
}

.hero__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.partner-card__image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 24px;
    background: #ffffff;
}

.section {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
    padding: 48px 0;
}

.intro {
    width: min(960px, calc(100% - 40px));
    margin-top: 40px;
    padding: 26px 30px;
    background: var(--surface);
    border-left: 8px solid var(--accent);
    box-shadow: 0 10px 24px rgba(37, 41, 43, 0.08);
    font-size: 1.1rem;
}

.section h2 {
    margin: 0 0 12px;
    color: var(--dark);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 0;
}

.section__head {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: end;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--dark);
}

.section__head p,
.intro p {
    max-width: 740px;
    margin: 0;
    color: var(--muted);
}

.course-table {
    max-height: 430px;
    overflow: auto;
    background: var(--surface);
    border: 1px solid var(--line);
    box-shadow: 0 12px 28px rgba(37, 41, 43, 0.08);
}

table {
    width: 100%;
    min-width: 760px;
    border-collapse: collapse;
}

th,
td {
    padding: 15px 18px;
    text-align: left;
    border-bottom: 1px solid var(--line);
    vertical-align: top;
}

th {
    position: sticky;
    top: 0;
    z-index: 1;
    background: var(--dark);
    color: #ffffff;
    font-size: 0.86rem;
    font-weight: 800;
    text-transform: uppercase;
}

tbody tr:nth-child(even) {
    background: var(--soft);
}

tbody tr:hover {
    background: #edf2f1;
}

.book-link,
button,
.admin-actions a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 18px;
    border: 0;
    background: var(--accent);
    color: #ffffff;
    font: inherit;
    font-weight: 800;
    cursor: pointer;
}

.book-link:hover,
button:hover,
.admin-actions a:hover {
    background: var(--accent-dark);
    text-decoration: none;
}

.empty {
    color: var(--muted);
    text-align: center;
}

.partner-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.partner-card {
    background: var(--surface);
    border: 1px solid var(--line);
    box-shadow: 0 10px 22px rgba(37, 41, 43, 0.07);
}

.partner-card__image {
    min-height: 220px;
    border: 0;
    border-bottom: 6px solid var(--accent);
    box-shadow: none;
}

.partner-card h3,
.partner-card p {
    margin: 0;
    padding: 0 22px;
}

.partner-card h3 {
    padding-top: 22px;
    color: var(--dark);
    font-size: 1.35rem;
    font-weight: 800;
}

.partner-card p {
    padding-bottom: 24px;
    color: var(--muted);
}

.footer {
    display: flex;
    justify-content: center;
    gap: 28px;
    padding: 32px 20px;
    background: var(--dark);
}

.footer a {
    color: #ffffff;
}

.admin-page {
    background: var(--soft);
}

.login-box,
.admin-shell {
    width: min(960px, calc(100% - 32px));
    margin: 48px auto;
    background: var(--surface);
    border: 1px solid var(--line);
    padding: 28px;
    box-shadow: 0 10px 24px rgba(37, 41, 43, 0.08);
}

.login-box {
    width: min(420px, calc(100% - 32px));
}

.login-box h1,
.admin-shell h1 {
    margin: 0 0 22px;
    font-weight: 800;
}

.login-box form,
.admin-form {
    display: grid;
    gap: 16px;
}

label {
    display: grid;
    gap: 7px;
    color: #314044;
    font-weight: 800;
}

input {
    width: 100%;
    min-height: 42px;
    padding: 9px 11px;
    border: 1px solid #b9c6c9;
    background: #ffffff;
    color: var(--ink);
    font: inherit;
}

input:focus {
    outline: 3px solid rgba(181, 31, 47, 0.16);
    border-color: var(--accent);
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
}

.checkbox input {
    width: auto;
    min-height: auto;
}

.alert {
    padding: 12px 14px;
    background: #ffe9ed;
    color: #8b1529;
    border: 1px solid #f1b6c0;
}

.admin-head {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: center;
    margin-bottom: 22px;
}

.admin-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.admin-table {
    max-height: 620px;
}

.admin-form-shell {
    width: min(680px, calc(100% - 32px));
}

@media (max-width: 760px) {
    body {
        overflow-x: hidden;
    }

    .hero,
    .partner-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        min-height: 0;
        gap: 24px;
        padding: 34px 18px 30px;
        border-bottom-width: 6px;
    }

    .hero h1 {
        font-size: clamp(32px, 10vw, 48px);
        line-height: 1.08;
    }

    .hero__image {
        min-height: 210px;
        box-shadow: none;
    }

    .section {
        width: calc(100% - 28px);
        padding: 34px 0;
    }

    .intro {
        width: calc(100% - 28px);
        margin-top: 28px;
        padding: 20px;
        border-left-width: 6px;
        font-size: 1rem;
    }

    .section h2 {
        font-size: 1.55rem;
    }

    .section__head,
    .admin-head {
        display: block;
    }

    .section__head p {
        margin-top: 6px;
    }

    .course-table {
        max-height: 360px;
        margin-right: -14px;
        border-right: 0;
        -webkit-overflow-scrolling: touch;
    }

    table {
        min-width: 680px;
    }

    th,
    td {
        padding: 12px 14px;
        font-size: 0.92rem;
    }

    .book-link,
    button,
    .admin-actions a {
        min-height: 40px;
        padding: 0 14px;
    }

    .partner-grid {
        gap: 18px;
    }

    .partner-card__image {
        min-height: 170px;
    }

    .partner-card__image img {
        padding: 18px;
    }

    .partner-card h3 {
        padding-top: 18px;
        font-size: 1.2rem;
    }

    .partner-card p {
        padding-bottom: 20px;
    }

    .footer {
        flex-wrap: wrap;
        gap: 18px;
        padding: 26px 16px;
    }

    .login-box,
    .admin-shell,
    .admin-form-shell {
        width: calc(100% - 28px);
        margin: 22px auto;
        padding: 20px;
    }

    .admin-actions {
        margin-top: 14px;
    }
}

@media (max-width: 420px) {
    .hero {
        padding-left: 14px;
        padding-right: 14px;
    }

    .hero h1 {
        font-size: clamp(29px, 11vw, 40px);
    }

    .hero__image {
        min-height: 180px;
    }

    .section,
    .intro {
        width: calc(100% - 22px);
    }

    table {
        min-width: 620px;
    }

    th,
    td {
        padding: 11px 12px;
        font-size: 0.88rem;
    }
}