/* ── Tools Index ─────────────────────────────────────────────────────────── */

.tools-intro {
    margin-bottom: 2rem;
    max-width: 700px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.tool-card {
    display: block;
    padding: 1.8rem 1.6rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    text-decoration: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.tool-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px var(--shadow-color);
    color: var(--text-color);
}

.tool-card-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    line-height: 1;
}

.tool-card h2 {
    font-size: 1.15rem;
    margin: 0 0 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.tool-card p {
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.5;
}

/* ── Tool Page ───────────────────────────────────────────────────────────── */

.tool-page h1 {
    font-size: 28px;
    margin-top: 0;
}

.tool-description {
    font-size: 1rem;
    color: var(--muted-color);
    margin-bottom: 2rem;
    max-width: 600px;
}

/* ── Calculator shared components ────────────────────────────────────────── */

.calc-container {
    max-width: 720px;
}

.calc-section {
    margin-bottom: 2.5rem;
}

.calc-section-heading {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 0.25rem;
    color: var(--title-color);
}

.calc-divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

.calc-form-section {
    margin-bottom: 1.5rem;
}

.calc-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1rem;
}

.calc-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1rem;
}

.calc-group label {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--title-color);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.calc-hint {
    font-size: 0.82rem;
    color: var(--subtle-color);
    margin: 0.1rem 0 0.75rem;
}

.calc-input {
    padding: 0.65rem 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    width: 100%;
    color: var(--title-color);
    background: var(--input-bg);
    transition: border-color 0.2s ease;
}

.calc-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.calc-input-small {
    max-width: 90px;
}

.calc-input-with-unit {
    display: flex;
    align-items: stretch;
}

.calc-input-with-unit .calc-input {
    border-radius: 3px 0 0 3px;
    border-right: none;
}

.calc-select {
    padding: 0.65rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0 3px 3px 0;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    background: var(--input-addon-bg);
    color: var(--title-color);
    cursor: pointer;
    white-space: nowrap;
}

.calc-unit-label {
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 3px 3px 0;
    background: var(--input-addon-bg);
    font-size: 0.9rem;
    color: var(--muted-color);
    align-self: stretch;
    display: flex;
    align-items: center;
}

.calc-inline-group {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}

.calc-inline-group label {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--title-color);
    white-space: nowrap;
}

.prefix-slash {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: 700;
    line-height: 1;
}

.calc-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.25rem;
    flex-wrap: wrap;
}

.calc-btn {
    background-color: var(--primary-color);
    color: var(--primary-contrast);
    border: none;
    padding: 0.65rem 1.6rem;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-radius: 3px;
    transition: background-color 0.2s ease;
}

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

.calc-btn-secondary {
    background-color: var(--tag-bg);
    color: var(--text-color);
}

.calc-btn-secondary:hover {
    filter: brightness(1.12);
}

.calc-error {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
    padding: 0.7rem 1rem;
    border-radius: 3px;
    font-size: 0.9rem;
    margin-top: 0.75rem;
}

.calc-error-inline {
    color: var(--error-text);
    font-size: 0.9rem;
    margin: 0.5rem 0 0;
}

.calc-results {
    margin-top: 1.25rem;
}

.calc-results-heading {
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted-color);
    margin: 0 0 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.calc-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

.calc-table tr:nth-child(even) {
    background: var(--surface-muted);
}

.calc-label {
    padding: 0.5rem 1rem 0.5rem 0;
    color: var(--muted-color);
    font-weight: 400;
    white-space: nowrap;
    vertical-align: middle;
    width: 40%;
}

.calc-value {
    padding: 0.5rem 0;
    color: var(--title-color);
    font-weight: 600;
    vertical-align: middle;
}

.calc-mono {
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.calc-note {
    font-size: 0.78rem;
    color: var(--subtle-color);
    font-weight: 400;
    font-family: var(--font-sans);
    margin-left: 0.3rem;
}

/* ── Subnet split ────────────────────────────────────────────────────────── */

.split-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.split-section h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 0.25rem;
}

.split-count {
    font-size: 0.88rem;
    color: var(--muted-color);
    margin: 0.75rem 0 0.5rem;
}

.split-list {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 360px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    background: var(--surface-soft);
    columns: 2;
    column-gap: 0;
}

.split-list li {
    padding: 0.3rem 0.9rem;
    font-size: 0.88rem;
    font-family: var(--font-mono);
    border-bottom: 1px solid var(--border-color);
    break-inside: avoid;
}

.split-list li:last-child {
    border-bottom: none;
}

/* ── VLAN calculator ─────────────────────────────────────────────────────── */

.vlan-commands-section,
.vlan-list-section {
    margin-top: 1.5rem;
}

.vlan-cmd-block {
    margin-bottom: 1.25rem;
}

.vlan-cmd-label {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--muted-color);
    margin: 0 0 0.35rem;
}

.vlan-cmd-pre {
    background: var(--surface-soft);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    padding: 0.75rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    overflow-x: auto;
    margin: 0;
    white-space: pre;
}

.vlan-list {
    list-style: none;
    padding: 0;
    margin: 0.5rem 0 0;
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    background: var(--surface-soft);
    columns: 4;
    column-gap: 0;
}

.vlan-list li {
    padding: 0.28rem 0.8rem;
    font-size: 0.88rem;
    font-family: var(--font-mono);
    border-bottom: 1px solid var(--border-color);
    break-inside: avoid;
}

.vlan-list li:last-child {
    border-bottom: none;
}

/* ── IP address converter ────────────────────────────────────────────────── */

.ipc-special-badge {
    display: inline-block;
    padding: 0.4rem 0.9rem;
    border-radius: 3px;
    font-size: 0.88rem;
    font-weight: 600;
    background: var(--tag-bg);
    color: var(--text-color);
    margin: 0;
}

.ipc-special-public {
    background: var(--success-bg, #d4edda);
    color: var(--success-text, #155724);
}

/* ── Prefix size finder ──────────────────────────────────────────────────── */

.psf-context {
    margin-top: 0.5rem;
}

.psf-nearby td,
.psf-nearby th {
    padding: 0.4rem 0.8rem 0.4rem 0;
    font-size: 0.88rem;
}

/* ── ASN checker ─────────────────────────────────────────────────────────── */

.asn-badge {
    display: inline-block;
    padding: 0.45rem 1rem;
    border-radius: 3px;
    font-size: 0.95rem;
    font-weight: 700;
}

.asn-badge-private {
    background: var(--tag-bg);
    color: var(--text-color);
}

.asn-badge-public {
    background: var(--success-bg, #d4edda);
    color: var(--success-text, #155724);
}

.asn-badge-reserved {
    background: var(--error-bg);
    color: var(--error-text);
}

.asn-ranges-section {
    margin-top: 1rem;
}

.asn-range-highlight {
    background: var(--surface-muted);
    font-weight: 600;
}

/* ── Bulk prefix formatter ───────────────────────────────────────────────── */

.bpf-textarea {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    resize: vertical;
    min-height: 140px;
}

.bpf-output-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-top: 1rem;
}

.bpf-output-block {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.bpf-output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.bpf-output-label {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--muted-color);
}

.bpf-copy-btn {
    font-size: 0.78rem;
    padding: 0.2rem 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    background: var(--tag-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.bpf-copy-btn:hover {
    background: var(--primary-color);
    color: var(--primary-contrast);
    border-color: var(--primary-color);
}

.bpf-output-area {
    width: 100%;
    resize: vertical;
    min-height: 120px;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    background: var(--surface-soft);
    color: var(--title-color);
    font-size: 0.88rem;
    line-height: 1.6;
}

/* ── Tools responsive ────────────────────────────────────────────────────── */

@media (max-width: 600px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }

    .calc-form-row {
        grid-template-columns: 1fr;
    }

    .split-list {
        columns: 1;
    }

    .vlan-list {
        columns: 2;
    }

    .bpf-output-grid {
        grid-template-columns: 1fr;
    }
}

/* ── BGP Routing Statistics ──────────────────────────────────────────────── */

.bgp-container {
    width: 100%;
}

.bgp-section-heading {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--title-color);
    margin: 0 0 1rem;
}

/* Stats cards */
.bgp-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.bgp-card {
    padding: 1.1rem 1.2rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--surface-soft);
}

.bgp-card-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted-color);
    margin-bottom: 0.5rem;
}

.bgp-card-value {
    font-family: var(--font-mono);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--title-color);
    line-height: 1.2;
    margin-bottom: 0.25rem;
}

.bgp-card--v4 .bgp-card-value { color: var(--primary-color); }
.bgp-card--v6 .bgp-card-value { color: #d97706; }

@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .bgp-card--v6 .bgp-card-value { color: #fbbf24; }
}
html[data-theme="dark"] .bgp-card--v6 .bgp-card-value { color: #fbbf24; }

.bgp-card-sub {
    font-size: 0.8rem;
    color: var(--subtle-color);
}

/* Chart */
.bgp-chart-section {
    margin-bottom: 2.5rem;
}

.bgp-chart-wrap {
    position: relative;
    height: 380px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 1.25rem 1rem 1rem;
    background: var(--surface-soft);
}

.bgp-source-note {
    font-size: 0.77rem;
    color: var(--subtle-color);
    margin: 0.45rem 0 0;
}

/* Milestones */
.bgp-milestones {
    margin-bottom: 2.5rem;
}

.bgp-milestone-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.bgp-milestone-table th {
    text-align: left;
    padding: 0.4rem 1rem 0.4rem 0;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted-color);
    border-bottom: 2px solid var(--border-color);
}

.bgp-milestone-table td {
    padding: 0.6rem 1rem 0.6rem 0;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
    line-height: 1.55;
}

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

.bgp-milestone-year {
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--primary-color);
    white-space: nowrap;
    width: 72px;
}

/* External links */
.bgp-links {
    margin-bottom: 2rem;
}

.bgp-link-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.bgp-ext-link {
    display: inline-block;
    padding: 0.4rem 0.85rem;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--text-color);
    transition: border-color 0.15s ease, color 0.15s ease;
}

.bgp-ext-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    text-decoration: none;
}

/* BGP responsive */
@media (max-width: 680px) {
    .bgp-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    .bgp-chart-wrap {
        height: 300px;
        padding: 0.75rem 0.5rem 0.75rem;
    }
}

@media (max-width: 380px) {
    .bgp-cards {
        grid-template-columns: 1fr;
    }
}