:root {
    --surface: #ffffff;
    --surface-strong: #ffffff;
    --text: #1f2d3a;
    --muted: #607080;
    --line: rgba(44, 62, 80, 0.16);
    --primary: #4ca1af;
    --primary-deep: #2c3e50;
    --secondary: #355164;
    --button-primary-start: #4ca1af;
    --button-primary-end: #2c3e50;
    --button-danger-start: #d14343;
    --button-danger-end: #9f2020;
    --shadow: 0 4px 12px rgba(44, 62, 80, 0.10);
    --shadow-soft: 0 1px 5px rgba(44, 62, 80, 0.07);
    --page-background:
        radial-gradient(circle at top left, rgba(76, 161, 175, 0.08), transparent 24%),
        radial-gradient(circle at top right, rgba(44, 62, 80, 0.05), transparent 22%),
        linear-gradient(180deg, #fafafa 0%, #f3f4f6 100%);
    --header-background: #ffffff;
    --footer-background: #ffffff;
    --input-background: #ffffff;
    --input-border: #cbd5e1;
    --input-error-background: #fffafa;
    --button-light-background: #ffffff;
    --modal-backdrop: rgba(31, 45, 58, 0.50);
    --error-surface: #fff1f2;
    --error-text: #991b1b;
    --error-line: rgba(220, 38, 38, 0.24);
    --success-text: #15803d;
    --danger-text: #b91c1c;
}

html.dark {
    color-scheme: dark;
    --surface: #17212b;
    --surface-strong: #1e2a35;
    --text: #e5edf3;
    --muted: #a7b5c3;
    --line: rgba(226, 232, 240, 0.16);
    --primary: #3b8999;
    --primary-deep: #243447;
    --secondary: #2f485b;
    --button-primary-start: #2d5b68;
    --button-primary-end: #213445;
    --button-danger-start: #65303a;
    --button-danger-end: #352027;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
    --shadow-soft: 0 2px 10px rgba(0, 0, 0, 0.20);
    --page-background:
        radial-gradient(circle at top left, rgba(100, 189, 202, 0.12), transparent 24%),
        radial-gradient(circle at top right, rgba(120, 144, 168, 0.10), transparent 22%),
        linear-gradient(180deg, #101820 0%, #0d141b 100%);
    --header-background: #121b24;
    --footer-background: #121b24;
    --input-background: #111a22;
    --input-border: #3a4a59;
    --input-error-background: rgba(127, 29, 29, 0.16);
    --button-light-background: #18232d;
    --modal-backdrop: rgba(3, 7, 18, 0.66);
    --error-surface: #341a20;
    --error-text: #fecaca;
    --error-line: rgba(248, 113, 113, 0.30);
    --success-text: #86efac;
    --danger-text: #fca5a5;
}

body {
    margin: 0;
    font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif;
    font-size: 15px;
    background: var(--page-background);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: auto;
}

.header-container,
.footer-container {
    width: min(1100px, calc(100% - 204px));
    margin: 0 auto;
}

.page-container {
    width: min(860px, calc(100% - 208px));
    margin: 0 auto;
}

.page-container.page-narrow {
    width: min(360px, calc(100% - 240px));
}

.page-container.page-medium {
    width: min(860px, calc(100% - 208px));
}

.page-container.page-wide {
    width: min(1100px, calc(100% - 204px));
}

.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-sizing: border-box;
    padding: 22px;
    box-shadow: var(--shadow);
}

h1,
h2,
h3 {
    margin-top: 0;
    font-size: 23px;
    line-height: 1.25;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--header-background);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 2px 6px rgba(44, 62, 80, 0.06);
    backdrop-filter: blur(14px);
}

.header-inner {
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 0 1px;
}

.brand {
    text-decoration: none;
    color: var(--text);
    display: inline-flex;
    align-items: center;
    gap: 0;
    margin-left: -4px;
    font-weight: 800;
    font-size: 20px;
    letter-spacing: 0.02em;
}

.brand-mark {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: inline-flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: transparent;
}

.brand-mark img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.header-navigation {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    min-width: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 6px;
    min-width: 0;
}

.header-menu-toggle {
    display: none;
    width: 41px;
    height: 41px;
    min-width: 41px;
    min-height: 41px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 9px;
    background: var(--button-light-background);
    color: var(--text);
    box-shadow: none;
}

.header-menu-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
}

.header-actions .button-link {
    min-height: 41px;
}

.button-link,
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: inherit;
    line-height: 1;
    letter-spacing: 0.01em;
    appearance: none;
    background: linear-gradient(135deg, var(--button-primary-start), var(--button-primary-end));
    color: #ffffff;
    border: none;
    border-radius: 9px;
    min-height: 41.5px;
    padding: 0 17px;
    text-decoration: none;
    cursor: pointer;
    font-size: 15.5px;
    font-weight: 400;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    transform: translateY(0);
    box-shadow: none;
}

.button-link:hover,
button:hover {
    transform: translateY(-2px);
}

.button-link:disabled,
button:disabled {
    cursor: not-allowed;
    opacity: 0.56;
    transform: none;
}

.button-link:disabled:hover,
button:disabled:hover {
    transform: none;
}

.button-link.secondary {
    background: var(--secondary);
    box-shadow: none;
}

html.dark .button-link:not(.light):not(.avatar-link):not(.danger-button),
html.dark button:not(.light):not(.theme-toggle):not(.auth-notification-close):not(.danger-button) {
    background: linear-gradient(135deg, var(--button-primary-start), var(--button-primary-end));
    color: var(--text);
    box-shadow: inset 0 0 0 1px rgba(100, 189, 202, 0.28);
}

.button-link.light {
    background: var(--button-light-background);
    color: var(--text);
    border: 1px solid var(--line);
    box-shadow: none;
    font-weight: 400;
    min-height: 40px;
}

.notification-link {
    gap: 7px;
}

.notification-badge {
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    border-radius: 999px;
    box-sizing: border-box;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--button-danger-start);
    color: #ffffff;
    font-size: 12.5px;
    line-height: 1;
}

html.dark .notification-badge {
    color: var(--text);
}

@media (max-width: 1080px) {
    .header-container,
    .footer-container {
        width: min(1100px, calc(100% - 112px));
    }

    .page-container,
    .page-container.page-medium,
    .page-container.page-wide {
        width: min(1100px, calc(100% - 112px));
    }

    .header-actions {
        gap: 5px;
    }

    .header-actions .button-link {
        padding-inline: 13px;
        font-size: 15px;
    }
}

@media (max-width: 940px) {
    .header-container,
    .footer-container {
        width: min(100%, calc(100% - 64px));
    }

    .page-container,
    .page-container.page-medium,
    .page-container.page-wide {
        width: min(100%, calc(100% - 64px));
    }

    .header-actions .button-link {
        padding-inline: 10px;
    }
}

@media (max-width: 840px) {
    .header-menu-toggle {
        display: inline-grid;
        place-items: center;
        gap: 4px;
    }

    .header-actions {
        position: absolute;
        top: calc(100% + 10px);
        right: 0;
        z-index: 20;
        display: none;
        width: max-content;
        min-width: 190px;
        max-width: min(270px, calc(100vw - 32px));
        max-height: calc(100vh - 84px);
        overflow-y: auto;
        box-sizing: border-box;
        grid-template-columns: 1fr;
        align-items: end;
        gap: 8px;
        padding: 12px;
        border: 1px solid var(--line);
        border-radius: 14px;
        background: var(--surface);
        box-shadow: var(--shadow);
    }

    .header-navigation.is-open .header-actions {
        display: grid;
    }

    .header-actions .button-link,
    .header-actions button,
    .header-actions .avatar-link,
    .header-actions .default-avatar-link {
        width: fit-content;
        max-width: 100%;
    }

    .header-actions .theme-toggle {
        justify-self: center;
        width: 41px;
    }

    .header-actions .avatar-link,
    .header-actions .default-avatar-link {
        justify-self: center;
        width: 40px;
    }
}

.theme-toggle {
    width: 41px;
    height: 41px;
    min-width: 41px;
    min-height: 41px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: var(--button-light-background);
    color: var(--text);
    box-shadow: none;
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: none;
}

.theme-icon {
    width: 24px;
    height: 24px;
}

.theme-icon-moon {
    display: none;
}

html.dark .theme-icon-sun {
    display: none;
}

html.dark .theme-icon-moon {
    display: block;
}

.avatar-link {
    width: 38px;
    height: 38px;
    padding: 0;
    border-radius: 50%;
    overflow: hidden;
    border: none;
    background: transparent;
    box-shadow: none;
}

.header-actions .avatar-link {
    min-height: 38px;
}

.avatar-link.light {
    background: transparent;
}

.avatar-link:hover {
    transform: translateY(-2px);
    box-shadow: none;
}

.avatar-link img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.default-avatar-link {
    width: 40px;
    height: 40px;
    min-height: 40px;
}

.header-actions .default-avatar-link {
    min-height: 40px;
}

.avatar-link .default-avatar-image {
    display: block;
}

.avatar-link .default-avatar-dark {
    display: none;
}

html.dark .avatar-link .default-avatar-light {
    display: none;
}

html.dark .avatar-link .default-avatar-dark {
    display: block;
}

main {
    flex: 1;
    font-size: 15px;
    padding: 39px 0;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 0 0 14px;
}

label {
    font-weight: 600;
}

input,
select,
textarea {
    font-family: inherit;
    padding: 12px 14px;
    border: 1px solid var(--input-border);
    border-radius: 12px;
    font-size: 15px;
    background: var(--input-background);
    color: var(--text);
    box-sizing: border-box;
    width: 100%;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    box-shadow: none;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: rgba(76, 161, 175, 0.55);
    box-shadow: 0 0 0 3px rgba(76, 161, 175, 0.12);
    background: var(--input-background);
}

.errorlist {
    color: var(--danger-text);
    margin: 0;
    padding-left: 21px;
    font-size: 14.5px;
}

.form-field .errorlist {
    margin-top: 8px;
}

.form-field.has-error input,
.form-field.has-error select,
.form-field.has-error textarea {
    border-color: rgba(185, 28, 28, 0.45);
    background: var(--input-error-background);
}

.form-field.has-error input:focus,
.form-field.has-error select:focus,
.form-field.has-error textarea:focus {
    border-color: rgba(185, 28, 28, 0.55);
    box-shadow: 0 0 0 3px rgba(185, 28, 28, 0.10);
}

.errorlist + .button-link,
.errorlist + button {
    margin-top: 0;
}

.errorlist.nonfield-errors {
    margin-bottom: 14px;
}

.meta {
    color: var(--muted);
    margin-bottom: 16px;
    font-size: 15px;
}

.site-footer {
    border-top: 1px solid var(--line);
    background: var(--footer-background);
    box-shadow: 0 -1px 5px rgba(44, 62, 80, 0.05);
}

.footer-inner {
    padding: 13px 1px 12px;
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    flex-wrap: wrap;
    font-size: 15.5px;
}

.footer-inner p {
    margin: 0;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 0;
}

.footer-brand-mark {
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    opacity: 0.58;
    filter: grayscale(0.2) saturate(0.75);
}

.footer-brand-mark img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.cookie-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    padding: 14px;
    overflow-x: auto;
}

.cookie-modal.is-open {
    display: flex;
}

.cookie-modal-backdrop {
    position: absolute;
    inset: 0;
    background: var(--modal-backdrop);
}

.cookie-modal-dialog {
    position: relative;
    z-index: 1;
    box-sizing: border-box;
    width: min(420px, 100%);
    min-width: 285px;
    padding: 25px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface);
    box-shadow: 0 18px 42px rgba(44, 62, 80, 0.24);
}

.cookie-modal-dialog h2 {
    margin: 0 0 18px;
    font-size: 18px;
    line-height: 1.25;
    text-align: center;
}

.cookie-modal-dialog p {
    margin: 0 0 18px;
    color: var(--muted);
    font-size: 15px;
    line-height: 1.4;
    text-align: left;
}

.cookie-modal-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.cookie-modal-actions .button-link,
.cookie-modal-actions button {
    width: 100%;
    min-height: 43.5px;
}

.resource-preview-dialog {
    width: min(960px, calc(100vw - 32px));
    height: min(720px, calc(100vh - 32px));
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface);
    color: var(--text);
    box-shadow: 0 18px 60px rgba(0, 0, 0, 0.26);
}

.resource-preview-dialog::backdrop {
    background: rgba(15, 23, 42, 0.52);
}

.resource-preview-shell {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    height: 100%;
}

.resource-preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px;
    border-bottom: 1px solid var(--line);
}

.resource-preview-header strong {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.resource-preview-actions {
    display: flex;
    flex: 0 0 auto;
    gap: 8px;
}

.resource-preview-actions .button-link,
.resource-preview-actions button {
    min-height: 36px;
    padding-inline: 12px;
}

.resource-preview-body {
    min-height: 0;
    background: var(--surface-strong);
}

.resource-preview-body iframe,
.resource-preview-body video,
.resource-preview-body img {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
}

.resource-preview-body video,
.resource-preview-body img {
    object-fit: contain;
}

@media (max-width: 640px) {
    .header-container,
    .footer-container {
        width: min(100%, calc(100% - 50px));
    }

    .page-container,
    .page-container.page-medium,
    .page-container.page-wide,
    .page-container.page-narrow {
        width: min(100%, calc(100% - 28px));
    }

    .page-container.page-narrow {
        width: 360px;
    }

    .header-inner {
        padding: 0 1px;
    }

    .card {
        padding: 16px 12px;
        border-radius: 20px;
    }

    .footer-inner {
        flex-direction: column;
    }

    .resource-preview-header {
        align-items: stretch;
        flex-direction: column;
    }

    .resource-preview-actions {
        flex-wrap: wrap;
    }
}

@media (max-width: 386px) {
    html,
    body {
        overflow-x: auto;
    }

    .site-header,
    main,
    .site-footer {
        min-width: 386px;
    }

    .header-container,
    .footer-container {
        width: 336px;
    }

    .page-container,
    .page-container.page-medium {
        width: 358px;
    }

    .page-container.page-wide {
        width: 358px;
    }

    .page-container.page-narrow {
        width: 336px;
    }
}