/*** Linkbox builder interface ***/

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    line-height: 1.5;
    background: #f3f5f7;
    color: #1f2937;
}

.builder-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 42px 18px;
}

.hero,
.panel,
.notice {
    background: #fff;
    border: 1px solid #d9e0e7;
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(31, 41, 55, 0.08);
}

.hero {
    padding: 30px;
    margin-bottom: 18px;
}

.hero h1 {
    margin: 0 0 8px;
    font-size: clamp(2rem, 5vw, 4rem);
    line-height: 1;
}

.hero p {
    max-width: 700px;
    margin: 0;
    color: #4b5563;
}

.panel {
    padding: 24px;
}

.form-row {
    display: grid;
    gap: 8px;
    margin-bottom: 16px;
}

label,
.legend {
    font-weight: 700;
}

input,
select,
button {
    font: inherit;
}

input,
select {
    width: 100%;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    padding: 12px 14px;
    background: #fff;
}

.link-row {
    display: grid;
    grid-template-columns: 1fr 1fr 2fr auto;
    gap: 10px;
    align-items: end;
    padding: 14px;
    margin-bottom: 12px;
    border: 1px solid #d9e0e7;
    border-radius: 14px;
    background: #f8fafc;
}

.link-row label {
    display: grid;
    gap: 6px;
    font-weight: 700;
    font-size: 0.9rem;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

button,
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border: 0;
    border-radius: 999px;
    padding: 10px 18px;
    background: #111827;
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    cursor: pointer;
}

button.secondary,
.button.secondary {
    background: #e5e7eb;
    color: #111827;
}

button.danger {
    background: #fee2e2;
    color: #991b1b;
}

button:hover,
.button:hover {
    filter: brightness(0.95);
}

.error-list {
    padding: 16px 18px;
    margin: 0 0 18px;
    border: 1px solid #fecaca;
    border-radius: 14px;
    background: #fff1f2;
    color: #991b1b;
}

.notice {
    padding: 24px;
    margin-top: 18px;
}

.url-box {
    word-break: break-all;
    padding: 14px;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: #f8fafc;
}

.help-text {
    color: #64748b;
    font-size: 0.92rem;
}

@media (max-width: 780px) {
    .link-row {
        grid-template-columns: 1fr;
    }

    .link-row button {
        width: 100%;
    }
}