/* CSS Variables for theming - jojijohn.com inspired dark theme */
:root {
    /* Dark theme matching jojijohn.com */
    --bg-primary: #060606;
    --bg-secondary: #0f0f0f;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #c4c4c4;
    --text-muted: #8b8b8b;
    --border-color: #2a2a2a;
    --accent-color: #f33f7e;
    --accent-hover: #ff5b96;
    --accent-light: rgba(243, 63, 126, 0.15);
    --success-color: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.15);
    --warning-color: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --error-color: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.15);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --network-bit-color: #f33f7e;
    --host-bit-color: #22c55e;
    --glow-color: rgba(243, 63, 126, 0.3);
}

/* Dark mode is the default - no changes needed for prefers-color-scheme: dark */
@media (prefers-color-scheme: light) {
    /* Keep the same dark theme for consistency with jojijohn.com */
    :root {
        --bg-primary: #060606;
        --bg-secondary: #0f0f0f;
        --bg-tertiary: #1a1a1a;
        --text-primary: #ffffff;
        --text-secondary: #c4c4c4;
        --text-muted: #8b8b8b;
        --border-color: #2a2a2a;
    }
}

/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    /* Subtle radial gradient for depth */
    background-image:
        radial-gradient(ellipse at 20% 0%, rgba(243, 63, 126, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(243, 63, 126, 0.05) 0%, transparent 50%);
    background-attachment: fixed;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.header h1::first-letter {
    color: var(--accent-color);
}

.header p {
    color: var(--text-muted);
    font-size: 0.9375rem;
}

/* Tabs */
.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.tab-button {
    padding: 0.75rem 1.25rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.tab-button:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.tab-button:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.tab-button[aria-selected="true"] {
    background-color: var(--accent-light);
    color: var(--accent-color);
    font-weight: 600;
    box-shadow: 0 0 20px var(--glow-color);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.2s ease;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Cards */
.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-title::before {
    content: '';
    width: 4px;
    height: 1.25rem;
    background-color: var(--accent-color);
    border-radius: 2px;
}

/* Form elements */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-light), 0 0 15px var(--glow-color);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input.error {
    border-color: var(--error-color);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-hint {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 0.375rem;
}

.form-error {
    font-size: 0.8125rem;
    color: var(--error-color);
    margin-top: 0.375rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Checkbox */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-input {
    width: 1.125rem;
    height: 1.125rem;
    accent-color: var(--accent-color);
    cursor: pointer;
}

.checkbox-label {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    cursor: pointer;
}

/* Radio buttons */
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.radio-input {
    width: 1.125rem;
    height: 1.125rem;
    accent-color: var(--accent-color);
    cursor: pointer;
}

.radio-label {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #ffffff;
    box-shadow: 0 0 20px var(--glow-color);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 0 30px var(--glow-color);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-icon {
    padding: 0.5rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-icon.copied {
    background-color: var(--success-bg);
    border-color: var(--success-color);
    color: var(--success-color);
}

/* Results grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.result-item {
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.result-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.result-value {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-primary);
    word-break: break-all;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.result-value .value-text {
    flex: 1;
}

/* Compact results grid modifier */
.results-grid.compact {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.5rem;
}

.results-grid.compact .result-item {
    padding: 0.625rem 0.75rem;
    gap: 0.25rem;
}

.results-grid.compact .result-label {
    font-size: 0.6875rem;
}

.results-grid.compact .result-value {
    font-size: 0.875rem;
}

/* Binary representation */
.binary-display {
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-top: 1rem;
    overflow-x: auto;
}

.binary-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    margin-bottom: 0.75rem;
}

.binary-value {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    line-height: 1.8;
    word-break: break-all;
}

.binary-value .network-bit {
    color: var(--network-bit-color);
    font-weight: 600;
}

.binary-value .host-bit {
    color: var(--host-bit-color);
}

.binary-value .separator {
    color: var(--text-muted);
    margin: 0 0.125rem;
}

/* Binary table (ipcalc-style) */
.binary-table {
    display: grid;
    grid-template-columns: auto auto 1fr;
    gap: 0.25rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.binary-row {
    display: contents;
}

.binary-row-label {
    color: var(--text-muted);
    white-space: nowrap;
}

.binary-row-value {
    text-align: right;
    color: var(--text-primary);
    white-space: nowrap;
}

.binary-row-binary {
    white-space: nowrap;
}

.binary-row-binary .network-bit {
    color: var(--network-bit-color);
    font-weight: 600;
}

.binary-row-binary .host-bit {
    color: var(--host-bit-color);
}

.binary-row-separator {
    grid-column: 1 / -1;
    border-top: 1px dashed var(--border-color);
    margin: 0.5rem 0;
}

.binary-row-note {
    color: var(--text-muted);
    font-size: 0.8125rem;
    margin-left: 0.5rem;
}

@media (max-width: 768px) {
    .binary-table {
        font-size: 0.75rem;
        gap: 0.25rem 0.5rem;
    }

    .binary-row-note {
        display: none;
    }
}

@media (max-width: 480px) {
    .binary-table {
        grid-template-columns: auto 1fr;
    }

    .binary-row-binary {
        display: none;
    }

    .binary-row-value {
        text-align: left;
    }
}

.binary-legend {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.75rem;
    font-size: 0.8125rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.legend-color {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 2px;
}

.legend-color.network {
    background-color: var(--network-bit-color);
}

.legend-color.host {
    background-color: var(--host-bit-color);
}

/* Table */
.table-container {
    overflow-x: auto;
    margin-top: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

/* Scrollable table with fixed height */
.table-scrollable-wrapper {
    margin-top: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.table-scrollable-wrapper .table-header {
    background-color: var(--bg-tertiary);
    border-bottom: 2px solid var(--border-color);
}

.table-scrollable-wrapper .table-header table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

.table-scrollable-wrapper .table-header th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.table-scrollable-wrapper .table-body {
    max-height: 350px;
    overflow-y: auto;
    overflow-x: hidden;
}

.table-scrollable-wrapper .table-body table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

.table-scrollable-wrapper .table-body td {
    padding: 0.625rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
}

.table-scrollable-wrapper .table-body tr:last-child td {
    border-bottom: none;
}

.table-scrollable-wrapper .table-body tr:hover td {
    background-color: var(--bg-tertiary);
}

.table-scrollable-wrapper .table-body tr.highlighted-row td {
    background-color: var(--accent-light);
    font-weight: 600;
}

.table-scrollable-wrapper .col-num { width: 8%; }
.table-scrollable-wrapper .col-network { width: 28%; }
.table-scrollable-wrapper .col-range { width: 36%; }
.table-scrollable-wrapper .col-broadcast { width: 28%; }

@media (max-width: 768px) {
    .table-scrollable-wrapper .table-header th,
    .table-scrollable-wrapper .table-body td {
        padding: 0.5rem 0.5rem;
        font-size: 0.75rem;
    }
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

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

.data-table tr:hover td {
    background-color: var(--bg-tertiary);
}

.data-table tr.highlighted-row td {
    background-color: var(--accent-light);
    font-weight: 600;
}

.data-table tr.highlighted-row:hover td {
    background-color: var(--accent-light);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert[hidden],
[hidden] {
    display: none !important;
}

.alert-warning {
    background-color: var(--warning-bg);
    border: 1px solid var(--warning-color);
}

.alert-warning .alert-icon {
    color: var(--warning-color);
}

.alert-info {
    background-color: var(--accent-light);
    border: 1px solid var(--accent-color);
}

.alert-info .alert-icon {
    color: var(--accent-color);
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.alert-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Suggestions list */
.suggestions-list {
    list-style: none;
    margin-top: 1rem;
}

.suggestions-list li {
    padding: 0.75rem 1rem;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.9375rem;
}

/* Visually hidden (for screen readers) */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ARIA live region */
.aria-live {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .tabs {
        justify-content: stretch;
    }

    .tab-button {
        flex: 1;
        text-align: center;
        padding: 0.625rem 0.75rem;
        font-size: 0.8125rem;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .data-table {
        font-size: 0.75rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.5rem 0.75rem;
    }
}

/* Cloud awareness note */
.cloud-note {
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--bg-tertiary) 100%);
    border: 1px solid var(--accent-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-top: 1.5rem;
}

.cloud-note-title {
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.cloud-note-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.8125rem;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Button group */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

/* Stats row */
.stats-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.stat-item {
    background-color: var(--bg-tertiary);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    flex: 1;
    min-width: 150px;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}