:root {
    --c-bg: #f4f6fb;
    --c-bg-card: #ffffff;
    --c-text: #1c2237;
    --c-text-muted: #5b657f;
    --c-border: #d8deec;
    --c-primary: #3f5cf6;
    --c-primary-dark: #2842cc;
    --c-success: #1aa46b;
    --c-danger: #d6334a;
    --c-warning: #d68d2a;
    --c-shadow: 0 6px 24px rgba(28, 34, 55, 0.08);
    --radius: 12px;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    background: var(--c-bg);
    color: var(--c-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, "Helvetica Neue", sans-serif;
    font-size: 16px;
    line-height: 1.55;
}

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

a:hover {
    color: var(--c-primary-dark);
}

.container {
    width: 100%;
    max-width: 920px;
    margin: 0 auto;
    padding: 24px 20px;
}

.container--admin {
    max-width: 1200px;
}

.page-header {
    background: linear-gradient(135deg, #2c3e9d 0%, #5870ff 100%);
    color: #fff;
    box-shadow: var(--c-shadow);
}

.page-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
}

.page-header--admin {
    background: linear-gradient(135deg, #1c2237 0%, #2c3a64 100%);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-weight: 700;
    font-size: 18px;
    transition: opacity 0.15s;
}

.brand:hover,
.brand:focus,
.brand:visited {
    color: #fff;
}

.brand:hover {
    opacity: 0.85;
}

.brand__icon {
    font-size: 22px;
}

.page-nav {
    display: flex;
    gap: 18px;
}

.page-nav__link,
.page-nav__link:visited {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
}

.page-nav__link:hover {
    color: #fff;
}

.page-footer {
    margin-top: 32px;
    padding: 20px 0;
    color: var(--c-text-muted);
    font-size: 14px;
    text-align: center;
}

.intro {
    background: var(--c-bg-card);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--c-shadow);
    margin-bottom: 24px;
}

.intro h1 {
    margin: 0 0 8px;
    font-size: 28px;
}

.intro p {
    margin: 0;
    color: var(--c-text-muted);
}

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin: 0 0 18px;
    font-weight: 500;
}

.alert--success {
    background: #e0f5ec;
    color: var(--c-success);
}

.alert--danger {
    background: #fde2e6;
    color: var(--c-danger);
}

.alert--info {
    background: #e1ebff;
    color: var(--c-primary-dark);
}

.brief-form .section {
    background: var(--c-bg-card);
    border-radius: var(--radius);
    padding: 24px 28px;
    margin-bottom: 18px;
    box-shadow: var(--c-shadow);
}

.section__title {
    margin: 0 0 6px;
    font-size: 20px;
}

.section__description {
    margin: 0 0 18px;
    color: var(--c-text-muted);
    font-size: 14px;
}

.field {
    margin-bottom: 16px;
}

.field__label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
}

.field__label .required {
    color: var(--c-danger);
    margin-left: 4px;
}

.field__help {
    display: block;
    color: var(--c-text-muted);
    font-size: 13px;
    margin-top: 4px;
}

.field input[type=text],
.field input[type=email],
.field input[type=tel],
.field input[type=password],
.field textarea,
.field select {
    width: 100%;
    border: 1px solid var(--c-border);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 15px;
    color: var(--c-text);
    font-family: inherit;
    background: #fff;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(63, 92, 246, 0.16);
}

.field textarea {
    min-height: 100px;
    resize: vertical;
}

.field--error input,
.field--error textarea,
.field--error select {
    border-color: var(--c-danger);
    background: #fff8f9;
}

.field__error {
    color: var(--c-danger);
    font-size: 13px;
    margin-top: 4px;
}

.options {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.option {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border: 1px solid var(--c-border);
    border-radius: 999px;
    background: #fff;
    cursor: pointer;
    font-size: 14px;
    user-select: none;
    transition: background 0.15s, border-color 0.15s;
}

.option:hover {
    border-color: var(--c-primary);
}

.option input {
    accent-color: var(--c-primary);
}

.option--checked {
    border-color: var(--c-primary);
    background: rgba(63, 92, 246, 0.08);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 8px;
    border: 1px solid transparent;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    line-height: 1.2;
}

.btn--primary {
    background: var(--c-primary);
    color: #fff;
}

.btn--primary:hover {
    background: var(--c-primary-dark);
    color: #fff;
}

.btn--secondary {
    background: #fff;
    color: var(--c-text);
    border-color: var(--c-border);
}

.btn--secondary:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
}

.btn--danger {
    background: #fff;
    color: var(--c-danger);
    border-color: #f7c4cb;
}

.btn--danger:hover {
    background: var(--c-danger);
    color: #fff;
    border-color: var(--c-danger);
}

.thanks {
    background: var(--c-bg-card);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--c-shadow);
    text-align: center;
}

.thanks h1 {
    margin-top: 0;
}

.thanks .btn {
    margin-top: 18px;
}

/* admin */

.admin-card {
    background: var(--c-bg-card);
    border-radius: var(--radius);
    padding: 24px 28px;
    box-shadow: var(--c-shadow);
    margin-bottom: 18px;
}

.admin-card h1 {
    margin-top: 0;
    font-size: 22px;
}

.admin-toolbar {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.admin-toolbar form {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.admin-toolbar input[type=text],
.admin-toolbar select {
    padding: 8px 12px;
    border: 1px solid var(--c-border);
    border-radius: 8px;
    background: #fff;
    font-size: 14px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    border-spacing: 0;
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--c-shadow);
    font-size: 14px;
}

.table th,
.table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--c-border);
    text-align: left;
    vertical-align: middle;
}

.table th {
    background: #f1f4fc;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--c-text-muted);
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover td {
    background: #fafbff;
}

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}

.badge--new {
    background: #e1ebff;
    color: var(--c-primary-dark);
}

.badge--in_progress {
    background: #fff1d6;
    color: var(--c-warning);
}

.badge--done {
    background: #d8f1e3;
    color: var(--c-success);
}

.badge--archived {
    background: #ececec;
    color: var(--c-text-muted);
}

/*
    ВАЖЛИВО:
    .actions може використовуватись як звичайний блок на інших сторінках,
    але в таблиці td.actions НЕ можна робити flex-елементом.
*/

.actions {
    display: inline-flex;
    gap: 6px;
    flex-wrap: wrap;
    align-items: center;
}

.table td.actions {
    display: table-cell;
    vertical-align: middle;
    white-space: nowrap;
}

.actions__group {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    align-items: center;
}

.actions .btn,
.actions__group .btn {
    padding: 6px 12px;
    font-size: 13px;
}

.brief-detail dt {
    font-weight: 600;
    color: var(--c-text-muted);
    margin-top: 12px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 12px;
}

.brief-detail dd {
    margin: 4px 0 0;
    padding: 0;
}

.brief-detail .section-block {
    border-top: 1px solid var(--c-border);
    padding-top: 16px;
    margin-top: 18px;
}

.brief-detail .section-block:first-child {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
}

.muted {
    color: var(--c-text-muted);
    font-style: italic;
}

.login-card {
    max-width: 380px;
    margin: 60px auto;
    background: #fff;
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--c-shadow);
}

.login-card h1 {
    margin-top: 0;
}

.empty-state {
    background: #fff;
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    color: var(--c-text-muted);
    box-shadow: var(--c-shadow);
}

@media (max-width: 640px) {
    .page-header .container {
        padding: 14px 16px;
    }

    .container {
        padding: 16px;
    }

    .brief-form .section,
    .admin-card {
        padding: 18px;
    }

    .table {
        font-size: 13px;
    }

    .table th,
    .table td {
        padding: 10px 8px;
    }

    .actions__group {
        gap: 5px;
    }

    .actions__group .btn {
        padding: 6px 10px;
        font-size: 12px;
    }

    .form-actions {
        flex-direction: column-reverse;
    }

    .form-actions .btn {
        width: 100%;
    }
}

.delete-form {
    margin: 0;
    padding: 0;
    display: inline-flex;
}

.delete-form button {
    font-family: inherit;
}