:root {
    --background-gradient: linear-gradient(135deg, #f2f6ff 0%, #f9fbff 100%);
    --surface: #ffffff;
    --surface-muted: #f5f7fb;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-soft: #dbeafe;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow-soft: 0 12px 32px rgba(15, 23, 42, 0.08);
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 6px;
    --transition-fast: 150ms ease;
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: var(--background-gradient);
}

body {
    margin: 0;
    font-family: "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    padding: 56px 20px;
    background: transparent;
}

body > * {
    width: min(960px, 100%);
    margin: 0 auto;
}

.title {
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
    color: #ffffff;
    padding: 22px 28px;
    font-size: 1.75rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    letter-spacing: 0.02em;
}

.menu {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    padding: 20px 24px;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.menu a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    background: var(--accent);
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    border-radius: 999px;
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.menu a:hover,
.menu a:focus {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.3);
    color: #ffffff;
    text-decoration: none;
}

.menu a:active {
    transform: translateY(0);
}

.main {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-soft);
    color: var(--text-primary);
}

.main > :first-child {
    margin-top: 0;
}

.main > * + * {
    margin-top: 18px;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover,
a:focus {
    color: var(--accent-hover);
    text-decoration: underline;
}

p {
    margin: 0;
}

p + p {
    margin-top: 12px;
}

ul,
ol {
    margin: 0;
    padding-left: 20px;
    color: var(--text-secondary);
}

li + li {
    margin-top: 6px;
}

form {
    display: grid;
    gap: 18px;
}

form table {
    width: 100%;
    border-collapse: collapse;
}

form table td {
    padding: 10px 0;
    vertical-align: middle;
}

form table td:first-child {
    width: 30%;
    color: var(--text-secondary);
    font-weight: 500;
}

input,
textarea,
select {
    font: inherit;
    color: var(--text-primary);
    background: var(--surface-muted);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
    width: 100%;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    background: #fff;
}

textarea {
    resize: vertical;
    min-height: 120px;
}

input[type="checkbox"] {
    width: auto;
    height: auto;
    margin-right: 8px;
    accent-color: var(--accent);
}

input[type="submit"],
input[type="button"],
button {
    cursor: pointer;
    background: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    padding: 11px 22px;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.25);
    width: fit-content;
}

input[type="submit"]:hover,
input[type="button"]:hover,
button:hover,
input[type="submit"]:focus,
input[type="button"]:focus,
button:focus {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(37, 99, 235, 0.3);
}

input[type="submit"]:active,
input[type="button"]:active,
button:active {
    transform: translateY(0);
}

.errors,
.success {
    border-radius: var(--radius-md);
    padding: 16px 18px;
    border: 1px solid var(--border-color);
    background: var(--surface-muted);
    line-height: 1.5;
}

.errors {
    border-color: #fca5a5;
    background: #fef2f2;
    color: #b91c1c;
}

.success {
    border-color: #86efac;
    background: #ecfdf5;
    color: #047857;
}

.errors ul {
    margin-top: 12px;
}

.message_list {
    width: 100%;
    border-collapse: collapse;
    margin-top: 6px;
    font-size: 0.95rem;
}

.message_list th,
.message_list td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.message_list th {
    background: var(--surface-muted);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
}

.message_list tr:nth-child(even) {
    background: rgba(219, 234, 254, 0.3);
}

.message_list tr:hover {
    background: var(--accent-soft);
}

.message_list a {
    font-weight: 600;
}

#message_form {
    display: block;
}

#message_form textarea {
    min-height: 100px;
    margin-bottom: 12px;
}

#message_form input[type="checkbox"] {
    display: inline-block;
    margin-right: 8px;
    vertical-align: middle;
}

#message_form input[type="submit"] {
    margin-top: 12px;
}

#refresh[hidden] {
    display: none;
}

img {
    max-width: 100%;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.12);
}

form.link {
    display: inline;
}

form.link input[type="submit"] {
    background: none;
    border: none;
    padding: 0;
    font: inherit;
    color: var(--accent);
    text-decoration: underline;
    box-shadow: none;
    transition: color var(--transition-fast);
}

form.link input[type="submit"]:hover,
form.link input[type="submit"]:focus {
    color: var(--accent-hover);
}

@media (max-width: 768px) {
    body {
        padding: 40px 16px;
        font-size: 15px;
    }

    .title {
        font-size: 1.5rem;
        padding: 18px 22px;
    }

    .main {
        padding: 24px;
    }

    form table td:first-child {
        width: 40%;
    }
}

@media (max-width: 540px) {
    body {
        padding: 32px 14px;
    }

    .menu {
        padding: 18px;
    }

    .menu a {
        flex: 1 1 calc(50% - 8px);
        min-width: 130px;
    }

    form table,
    form table tbody,
    form table tr,
    form table td {
        display: block;
    }

    form table td:first-child {
        width: 100%;
        margin-bottom: 6px;
    }

    form table td {
        padding: 6px 0;
    }

    input,
    textarea,
    select {
        width: 100%;
    }
}