/* 2025 refresh for IP Tools Suite */

:root {
    --primary: #4ade80;
    --primary-strong: #22c55e;
    --accent: #60a5fa;
    --muted: #9ca3af;
    --surface: #0f172a;
    --card: rgba(255, 255, 255, 0.04);
    --card-strong: rgba(255, 255, 255, 0.08);
    --border: rgba(255, 255, 255, 0.08);
    --text: #e5e7eb;
    --text-strong: #f8fafc;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
    --font: 'Space Grotesk', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius-lg: 22px;
    --radius: 16px;
    --radius-sm: 10px;
    --gradient: radial-gradient(circle at 20% 20%, rgba(96, 165, 250, 0.4), transparent 35%),
                radial-gradient(circle at 80% 0%, rgba(74, 222, 128, 0.35), transparent 30%),
                linear-gradient(135deg, #0b1221 0%, #0a0f1a 100%);
}

[data-theme="light"] {
    --surface: #f2f5fb;
    --card: rgba(255, 255, 255, 0.72);
    --card-strong: rgba(255, 255, 255, 0.9);
    --border: rgba(15, 23, 42, 0.08);
    --text: #0f172a;
    --text-strong: #0b1221;
    --gradient: radial-gradient(circle at 20% 20%, rgba(74, 222, 128, 0.2), transparent 35%),
                radial-gradient(circle at 80% 0%, rgba(96, 165, 250, 0.25), transparent 30%),
                linear-gradient(135deg, #eef2ff 0%, #f8fafc 100%);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font);
    background: var(--gradient);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

.bg-accents {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(circle at 10% 10%, rgba(94, 234, 212, 0.14), transparent 20%),
                radial-gradient(circle at 90% 20%, rgba(96, 165, 250, 0.18), transparent 18%);
    filter: blur(60px);
    z-index: 0;
}

.top-bar {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(10, 15, 26, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 18px 0;
}

[data-theme="light"] .top-bar {
    background: rgba(255, 255, 255, 0.8);
}

.brand {
    display: flex;
    gap: 12px;
    align-items: center;
}

.brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: #0b1221;
    font-weight: 700;
    display: grid;
    place-items: center;
    box-shadow: var(--shadow);
}

.brand-title {
    font-weight: 700;
    color: var(--text-strong);
    letter-spacing: -0.01em;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.75rem;
    color: var(--muted);
    margin: 0 0 4px;
}

.ip-version-toggle {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.version-btn {
    border: none;
    background: var(--card);
    color: var(--muted);
    padding: 10px 16px;
    font-family: var(--font);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 160ms ease, color 160ms ease;
}

.version-btn + .version-btn {
    border-left: 1px solid var(--border);
}

.version-btn.active {
    background: linear-gradient(120deg, var(--primary) 0%, var(--accent) 100%);
    color: #0b1221;
}

.version-btn:not(.active):hover {
    background: var(--card-strong);
    color: var(--text-strong);
}

.ghost-btn {
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 200ms ease, border-color 200ms ease, background 200ms ease;
}

.ghost-btn:hover {
    transform: translateY(-1px);
    border-color: var(--accent);
    background: var(--card-strong);
}

.hero {
    position: relative;
    z-index: 1;
    padding: 64px 0 32px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    align-items: stretch;
}

.hero-copy h1 {
    font-size: clamp(2.2rem, 4vw, 3.2rem);
    margin: 14px 0 12px;
    color: var(--text-strong);
    letter-spacing: -0.02em;
}

.lede {
    max-width: 620px;
    color: var(--muted);
    font-size: 1.02rem;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border-radius: 999px;
    padding: 8px 14px;
    font-weight: 600;
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text);
}

.pill.secondary {
    border-color: var(--accent);
    color: var(--text);
}

.pill.tertiary {
    border-color: var(--border);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 20px 0;
}

.cta {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    display: inline-flex;
    gap: 10px;
    align-items: center;
    font-weight: 600;
    border: 1px solid transparent;
}

.cta.primary {
    background: linear-gradient(120deg, var(--primary) 0%, var(--accent) 100%);
    color: #0b1221;
    box-shadow: var(--shadow);
}

.cta.ghost {
    border-color: var(--border);
    background: var(--card);
    color: var(--text);
}

.hero-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.meta-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    background: var(--card);
}

.meta-label {
    display: block;
    color: var(--muted);
    font-size: 0.85rem;
    margin-bottom: 6px;
}

.hero-visual .glass-card {
    background: var(--card-strong);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.glass-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(90deg, rgba(96, 165, 250, 0.15), rgba(74, 222, 128, 0.15));
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.dot.red { background: #f87171; }
.dot.amber { background: #fbbf24; }
.dot.green { background: #34d399; }

.window-title {
    color: var(--muted);
    font-size: 0.9rem;
}

.glass-body {
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

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

.chip {
    padding: 6px 10px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--card);
    font-size: 0.9rem;
}

.chip.success { border-color: var(--primary); color: var(--primary); }
.chip.accent { border-color: var(--accent); color: var(--accent); }
.chip.muted { color: var(--muted); }

.mini-table {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.mini-row {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    padding: 10px 12px;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.95rem;
}

.mini-row:last-child {
    border-bottom: none;
}

.callout {
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.12), rgba(96, 165, 250, 0.12));
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    color: var(--text-strong);
}

.tool-shell {
    position: relative;
    z-index: 1;
    margin-top: 12px;
    margin-bottom: 48px;
}

.tab-wrapper {
    background: var(--card-strong);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    box-shadow: var(--shadow);
}

.tab-title h2 {
    margin: 4px 0;
    color: var(--text-strong);
}

.tab-note {
    color: var(--muted);
    font-size: 0.95rem;
}

.custom-tabs {
    border: none;
    gap: 12px;
    flex-wrap: wrap;
}

.custom-tabs .nav-link {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    color: var(--muted);
    background: var(--card);
    min-width: 180px;
    transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.custom-tabs .nav-link small {
    display: block;
    margin-top: 6px;
    color: var(--muted);
    font-size: 0.85rem;
}

.custom-tabs .nav-link.active {
    border-color: var(--primary);
    color: var(--text-strong);
    box-shadow: var(--shadow);
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.12), rgba(96, 165, 250, 0.16));
}

.tab-content-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
}

.tool-content {
    margin-top: 22px;
    background: var(--card-strong);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.tool-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.tool-header h3 {
    margin: 6px 0;
    color: var(--text-strong);
}

.tool-header p {
    color: var(--muted);
    margin: 0;
}

.calculation-form {
    margin-bottom: 16px;
}

.form-section,
.input-content {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    background: var(--card);
}

.form-label {
    font-weight: 600;
    color: var(--text-strong);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.custom-input,
.custom-textarea {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    width: 100%;
    font-family: 'Monaco', 'Consolas', monospace;
}

.custom-input:focus,
.custom-textarea:focus {
    outline: 2px solid var(--accent);
    box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.25);
}

.input-hint {
    color: var(--muted);
    font-size: 0.9rem;
    margin-top: 6px;
}

.btn-calculate {
    background: linear-gradient(120deg, var(--primary) 0%, var(--accent) 100%);
    border: none;
    color: #0b1221;
    font-weight: 700;
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    min-width: 160px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.btn-calculate:hover {
    transform: translateY(-1px);
}

.btn-loading {
    display: none;
    position: absolute;
    inset: 0;
    align-items: center;
    justify-content: center;
}

.btn-calculate:disabled {
    opacity: 0.7;
}

.input-method-tabs {
    margin-bottom: 14px;
}

.custom-pills .nav-link {
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    color: var(--muted);
}

.custom-pills .nav-link.active {
    background: var(--card-strong);
    color: var(--text-strong);
    border-color: var(--accent);
}

.file-upload-area {
    border: 1px dashed var(--border);
    padding: 26px;
    border-radius: var(--radius);
    text-align: center;
    background: var(--card);
    cursor: pointer;
    transition: border-color 200ms ease, transform 200ms ease;
}

.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.form-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    margin-top: 12px;
}

.results-section {
    margin-top: 18px;
    animation: fadeIn 320ms ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.results-header {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.results-header h4 {
    margin: 0;
    color: var(--text-strong);
}

.table-container {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow-x: auto;
    background: var(--card);
}

.table-modern th,
.table-modern td {
    color: var(--text);
    vertical-align: middle;
}

.table-modern th {
    background: var(--card-strong);
    border: none;
}

.table-modern td {
    border-color: var(--border);
    background: var(--surface);
    white-space: nowrap;
}

.primary-value {
    font-family: 'Monaco', 'Consolas', monospace;
    color: var(--text-strong);
    font-weight: 600;
}

.binary-value {
    font-family: 'Monaco', 'Consolas', monospace;
    color: var(--muted);
    font-size: 0.9rem;
    word-break: break-all;
    overflow-wrap: anywhere;
    line-height: 1.35;
}

.cidr-badge {
    background: linear-gradient(120deg, var(--accent), var(--primary));
    color: #0b1221;
    padding: 4px 8px;
    border-radius: 12px;
    font-family: 'Monaco', 'Consolas', monospace;
}

.hosts-count {
    color: var(--primary);
    font-weight: 700;
}

.class-info {
    color: var(--muted);
}

.complement-ranges,
.consolidated-ranges {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card);
}

.ranges-header {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    flex-wrap: wrap;
}

.ranges-content {
    padding: 12px;
    max-height: 320px;
    overflow-y: auto;
}

.ranges-content.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 8px;
}

.range-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    background: var(--surface);
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Monaco', 'Consolas', monospace;
}

.range-item .badge {
    background: var(--card-strong);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px 8px;
    color: var(--muted);
    font-size: 0.85rem;
}

.no-ranges {
    color: var(--muted);
    text-align: center;
    padding: 14px;
}

.copy-btn {
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
}

.result-table {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--surface);
}

.result-row {
    display: flex;
    align-items: baseline;
    gap: 16px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
}

.result-row:last-child {
    border-bottom: none;
}

.result-label {
    color: var(--muted);
    font-size: 0.9rem;
    flex-shrink: 0;
    width: 100px;
}

.result-values {
    flex: 1;
    min-width: 0;
}

.result-divider {
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0.4;
}

[data-version="6"] .binary-value {
    font-size: 0.78rem;
}

.consolidation-stats {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 12px;
}

.stat-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    display: flex;
    gap: 10px;
    align-items: center;
    background: var(--surface);
    min-width: 190px;
}

.stat-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: grid;
    place-items: center;
    color: #0b1221;
    background: linear-gradient(120deg, var(--primary), var(--accent));
}

.stat-icon.success {
    background: linear-gradient(120deg, var(--accent), var(--primary));
}

.stat-number {
    font-size: 1.4rem;
    font-weight: 700;
}

.stat-label {
    color: var(--muted);
    font-size: 0.92rem;
}

.stat-arrow {
    color: var(--muted);
}

.footer-section {
    border-top: 1px solid var(--border);
    padding: 18px 0 24px;
    background: rgba(0, 0, 0, 0.08);
    color: var(--muted);
}

.footer-badge {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    background: var(--card);
    color: var(--text);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.dot-sep {
    color: var(--muted);
}

.toast-shell {
    position: fixed;
    left: 50%;
    bottom: 28px;
    transform: translate(-50%, 20px);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    background: var(--card-strong);
    border: 1px solid var(--border);
    color: var(--text-strong);
    opacity: 0;
    transition: transform 180ms ease, opacity 180ms ease;
    box-shadow: var(--shadow);
    z-index: 20;
}

.toast-shell.show {
    opacity: 1;
    transform: translate(-50%, 0);
}

.toast-shell.success { border-color: var(--primary); }
.toast-shell.error { border-color: #f87171; }

.alert-danger {
    background: rgba(248, 113, 113, 0.14);
    color: #fecdd3;
    border: 1px solid rgba(248, 113, 113, 0.5);
    border-radius: var(--radius-sm);
}

[data-theme="light"] .alert-danger {
    color: #991b1b;
    background: rgba(248, 113, 113, 0.12);
    border-color: rgba(220, 38, 38, 0.4);
}

.ranges-content::-webkit-scrollbar {
    width: 8px;
}

.ranges-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 999px;
}

@media (max-width: 992px) {
    .hero {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .top-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .hero {
        padding-top: 42px;
    }

    .tool-content {
        padding: 18px;
    }

    .custom-tabs .nav-link {
        width: 100%;
    }

    .result-row {
        flex-direction: column;
        gap: 4px;
    }

    .result-label {
        width: auto;
    }

    .ranges-content.two-column {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 540px) {
    body {
        padding: 0 12px;
    }

    .top-bar {
        border-radius: 0 0 18px 18px;
    }

    .cta {
        width: 100%;
        justify-content: center;
    }

    .tool-content,
    .tab-wrapper {
        padding: 14px;
    }

    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }
}