:root {
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  --surface: rgba(255, 255, 255, 0.88);
  --glass-border: rgba(255, 255, 255, 0.45);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary: #4f46e5;
  --primary-glow: rgba(79, 70, 229, 0.22);
  --accent: #38bdf8;
  --success: #10b981;
  --danger: #ef4444;
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --input-bg: #fff;
  --input-border: #cbd5e1;
  --focus-ring: rgba(79, 70, 229, 0.2);
}

body.dark-mode {
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  --surface: rgba(30, 41, 59, 0.82);
  --glass-border: rgba(255, 255, 255, 0.06);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.22);
  --card-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.55);
  --input-bg: #0f172a;
  --input-border: #334155;
  --focus-ring: rgba(99, 102, 241, 0.25);
}

/* CIDR Calculator Specific Styles */

/* Hero Overrides for this tool */
.page-hero {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
    gap: 16px;
    flex-wrap: wrap;
    background: none !important;
    text-align: left !important;
    padding: 0 !important;
    color: inherit !important;
}

.page-hero div h1 {
    font-size: 2.3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text-main) !important;
    background: none !important;
    -webkit-text-fill-color: initial !important;
    line-height: 1.15;
    margin-bottom: 6px;
}

.page-hero div p {
    color: var(--text-muted) !important;
    opacity: 1 !important;
    margin: 0 !important;
    max-width: none !important;
    font-size: 0.97rem;
    font-weight: 400;
}

/* Theme Toggle */
.theme-toggle {
    flex-shrink: 0;
    background: var(--surface);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 10px 20px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    backdrop-filter: blur(10px);
    box-shadow: var(--card-shadow);
    transition: all 0.25s;
}

.theme-toggle:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

/* Forms/Inputs */
.bar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 24px;
    box-shadow: var(--card-shadow);
    margin-bottom: 24px;
    transition: box-shadow 0.3s;
}

.bar input[type=text],
.bar select {
    color: var(--text-main);
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 12px;
    padding: 14px 16px;
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.bar input[type=text]:focus,
.bar select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--focus-ring);
}

.bar input[type=text] {
    flex: 1;
    min-width: 250px;
}

.bar select {
    min-width: 180px;
    cursor: pointer;
}

.hint {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9rem;
    margin-left: 8px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
    color: #fff;
    box-shadow: 0 4px 12px var(--primary-glow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--primary-glow);
}

/* Grid/Cards */
.wrap {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-bottom: 16px;
}

@media (max-width: 950px) {
    .wrap {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .wrap {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 520px) {
    .wrap {
        grid-template-columns: 1fr;
    }
}

.stat-card {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 18px;
    box-shadow: var(--card-shadow);
    position: relative;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

body.dark-mode .stat-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.label {
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-weight: 700;
}

.value {
    margin-top: 8px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-main);
    word-break: break-all;
}

.mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.value.good {
    color: var(--success);
}

.value.warn {
    color: var(--danger);
    font-weight: 800;
}

.value.bad {
    color: var(--danger);
}

.span-all {
    grid-column: 1 / -1;
}

.badge {
    position: absolute;
    top: 14px;
    right: 14px;
    font-size: 0.75rem;
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
    padding: 4px 10px;
    border-radius: 8px;
    font-weight: 800;
}

body.dark-mode .badge {
    background: rgba(99, 102, 241, 0.3);
    color: #818cf8;
}

/* Definition Card */
.definitions-card {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 35px;
    box-shadow: var(--card-shadow);
    margin-top: 30px;
}

.definitions-card h2 {
    margin: 0 0 6px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-main);
}

.definitions-card .card-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0 0 24px;
    line-height: 1.6;
}

.def-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.def-item {
    display: flex;
    gap: 16px;
    align-items: stretch;
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 20px;
    transition: transform 0.2s ease;
}

body.dark-mode .def-item {
    background: rgba(30, 41, 59, 0.4);
}

.def-item:hover {
    transform: translateX(4px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.05);
}

.def-badge {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 12px;
    font-size: 1.5rem;
    background: rgba(99, 102, 241, 0.12);
    color: var(--primary);
}

body.dark-mode .def-badge {
    background: rgba(99, 102, 241, 0.25);
    color: #818cf8;
}

.def-text {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.def-text strong {
    display: block;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 6px;
}

.def-text span {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .page-hero {
        flex-direction: column;
    }

    .bar {
        flex-direction: column;
        padding: 18px;
    }

    .bar input[type=text],
    .bar select,
    .btn {
        width: 100%;
        min-width: 100%;
    }

    .hint {
        margin-top: 8px;
        align-self: center;
    }

    .definitions-card {
        padding: 20px;
        border-radius: 16px;
    }

    .def-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 16px;
    }

    .def-badge {
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }
}