/**
 * DS4A Design System
 * Core stylesheet for consistent styling across the website
 *
 * Usage: <link rel="stylesheet" href="/css/ds4a.css">
 */

/* ============================================================================
   CSS Variables (Design Tokens)
   ============================================================================ */

:root {
    /* Backgrounds */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;

    /* Text */
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;

    /* Accent Colors */
    --accent-orange: #ff6b2c;
    --accent-blue: #2d9cdb;
    --accent-green: #27ae60;
    --accent-red: #e74c3c;
    --accent-yellow: #f1c40f;
    --accent-purple: #9b59b6;

    /* Borders */
    --border-color: #2a2a2a;
    --border-light: #333333;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-orange: 0 4px 20px rgba(255, 107, 44, 0.3);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
}

/* ============================================================================
   Base / Reset
   ============================================================================ */

*, *::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: 'Barlow', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--accent-orange);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: #ff8f5a;
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================================================
   Typography
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-orange { color: var(--accent-orange); }
.text-green { color: var(--accent-green); }
.text-red { color: var(--accent-red); }
.text-yellow { color: var(--accent-yellow); }
.text-blue { color: var(--accent-blue); }

.font-display { font-family: 'Bebas Neue', sans-serif; }
.font-condensed { font-family: 'Barlow Condensed', sans-serif; }
.font-mono { font-family: 'JetBrains Mono', 'Fira Code', monospace; }

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-orange) 0%, #ff8f5a 100%);
    color: var(--bg-primary);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, #d45520 0%, var(--accent-orange) 100%);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--accent-orange);
    border: 2px solid var(--accent-orange);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 107, 44, 0.1);
}

.btn-success {
    background: var(--accent-green);
    color: var(--text-primary);
}

.btn-success:hover:not(:disabled) {
    background: #219a52;
}

.btn-danger {
    background: var(--accent-red);
    color: var(--text-primary);
}

.btn-danger:hover:not(:disabled) {
    background: #c0392b;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-ghost:hover:not(:disabled) {
    border-color: var(--accent-orange);
    color: var(--accent-orange);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

.btn-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ============================================================================
   Cards
   ============================================================================ */

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.card-hover:hover {
    border-color: var(--accent-orange);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 107, 44, 0.15);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
}

/* ============================================================================
   Forms
   ============================================================================ */

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent-orange);
}

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

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.form-hint {
    margin-top: var(--spacing-xs);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.form-error {
    margin-top: var(--spacing-xs);
    font-size: 0.8rem;
    color: var(--accent-red);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

/* ============================================================================
   Alerts
   ============================================================================ */

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.alert-info {
    background: rgba(45, 156, 219, 0.1);
    border: 1px solid rgba(45, 156, 219, 0.3);
    color: var(--accent-blue);
}

.alert-success {
    background: rgba(39, 174, 96, 0.1);
    border: 1px solid rgba(39, 174, 96, 0.3);
    color: var(--accent-green);
}

.alert-warning {
    background: rgba(241, 196, 15, 0.1);
    border: 1px solid rgba(241, 196, 15, 0.3);
    color: var(--accent-yellow);
}

.alert-error {
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid rgba(231, 76, 60, 0.3);
    color: var(--accent-red);
}

/* ============================================================================
   Badges
   ============================================================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.5rem;
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
}

.badge-orange {
    background: rgba(255, 107, 44, 0.15);
    color: var(--accent-orange);
    border: 1px solid rgba(255, 107, 44, 0.3);
}

.badge-blue {
    background: rgba(45, 156, 219, 0.15);
    color: var(--accent-blue);
    border: 1px solid rgba(45, 156, 219, 0.3);
}

.badge-green {
    background: rgba(39, 174, 96, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(39, 174, 96, 0.3);
}

.badge-red {
    background: rgba(231, 76, 60, 0.15);
    color: var(--accent-red);
    border: 1px solid rgba(231, 76, 60, 0.3);
}

.badge-yellow {
    background: rgba(241, 196, 15, 0.15);
    color: var(--accent-yellow);
    border: 1px solid rgba(241, 196, 15, 0.3);
}

.badge-muted {
    background: rgba(102, 102, 102, 0.15);
    color: var(--text-muted);
    border: 1px solid rgba(102, 102, 102, 0.3);
}

/* Status badges (solid backgrounds) */
.status {
    display: inline-flex;
    align-items: center;
    padding: 0.15rem 0.4rem;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border-radius: var(--radius-sm);
}

.status-active { background: var(--accent-green); color: #fff; }
.status-inactive { background: var(--text-muted); color: #fff; }
.status-warning { background: var(--accent-yellow); color: #000; }
.status-error { background: var(--accent-red); color: #fff; }
.status-info { background: var(--accent-blue); color: #fff; }

/* ============================================================================
   Tables
   ============================================================================ */

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

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

tr:hover td {
    background: rgba(255, 107, 44, 0.03);
}

/* ============================================================================
   Panels (Card variant for tool pages)
   ============================================================================ */

.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.panel-body {
    padding: var(--spacing-lg);
}

/* ============================================================================
   Code / Output Boxes
   ============================================================================ */

.code-box,
.output-box {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    overflow-x: auto;
}

.output-box {
    color: var(--accent-green);
}

/* ============================================================================
   Grid Utilities
   ============================================================================ */

.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.grid-auto-sm {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

/* ============================================================================
   Flex Utilities
   ============================================================================ */

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* ============================================================================
   Spacing Utilities
   ============================================================================ */

.m-0 { margin: 0; }
.m-xs { margin: var(--spacing-xs); }
.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }

.mt-0 { margin-top: 0; }
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.p-0 { padding: 0; }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

/* ============================================================================
   Modal / Overlay
   ============================================================================ */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 400px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.modal-title {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    text-transform: uppercase;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--accent-orange);
}

/* ============================================================================
   Header (Common patterns)
   ============================================================================ */

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.site-logo img {
    height: 40px;
    width: auto;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-secondary);
}

.breadcrumb a:hover {
    color: var(--accent-orange);
}

.breadcrumb svg {
    width: 16px;
    height: 16px;
    opacity: 0.5;
}

/* ============================================================================
   Responsive
   ============================================================================ */

@media (max-width: 768px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

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

    .site-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .modal {
        padding: var(--spacing-lg);
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }

    .btn-group {
        flex-direction: column;
    }

    .btn-group .btn {
        width: 100%;
    }
}

/* ============================================================================
   Print Styles
   ============================================================================ */

@media print {
    body {
        background: #fff;
        color: #000;
    }

    .btn,
    .modal-overlay,
    .site-header {
        display: none;
    }
}