:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --dark: #0f172a;
    --light: #f8fafc;
    --white: #ffffff;
    --error: #e11d48;
    --success: #16a34a;
    --border: #e2e8f0;
    --text-muted: #64748b;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.5;
}

/* shapka of site */
header {
    background-color: var(--dark);
    color: var(--white);
    padding: 1rem 0;
}

.header-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    color: #94a3b8;
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    transition: color 0.2s ease;
}

nav a:hover, nav a.active {
    color: var(--white);
}

.btn-download {
    background: #334155;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.9rem;
}

/* main */
main {
    max-width: 1000px;
    margin: 2.5rem auto;
    padding: 0 1.5rem;
}

section {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
}

h2 {
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

/*(Grid) */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    border: 1px solid var(--border);
    padding: 1.5rem;
    border-radius: 8px;
    background: var(--white);
    position: relative;
}

.card h3 {
    margin: 0.5rem 0;
}

.card-meta {
    margin-top: 1rem;
    font-size: 0.9rem;
    border-top: 1px dashed var(--border);
    padding-top: 0.75rem;
    color: #475569;
}

/* statsus */
.badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: bold;
    padding: 2px 8px;
    border-radius: 20px;
}
.badge-danger { background: #ffe4e6; color: var(--error); }
.badge-success { background: #dcfce7; color: var(--success); }

/* timer */
.countdown-section {
    text-align: center;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
}

#countdown {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    margin-top: 0.5rem;
}


.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
}

input, select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    background: var(--light);
}

input:focus, select:focus {
    outline: 2px solid var(--primary);
    background: var(--white);
}

.btn-submit {
    background-color: var(--primary);
    color: var(--white);
    padding: 0.85rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    width: 100%;
    transition: background 0.2s;
}

.btn-submit:hover {
    background-color: var(--primary-hover);
}

/* errors */
.error-msg {
    color: var(--error);
    font-size: 0.85rem;
    display: block;
    margin-top: 0.25rem;
    min-height: 1.2rem;
}

/* admin */
.table-responsive {
    overflow-x: auto;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.admin-table th, .admin-table td {
    padding: 12px;
    border: 1px solid var(--border);
    text-align: left;
}

.admin-table th {
    background-color: #f1f5f9;
    font-weight: 600;
}

.admin-table tr:nth-child(even) {
    background-color: var(--light);
}

/* for phone */
@media (max-width: 650px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    nav a {
        margin: 0 10px;
    }
    section {
        padding: 1.25rem;
    }
}