/* ========================================
   AIUC-1 Navigator
   Editorial Technical Documentation Style
   ======================================== */

:root {
    /* Core palette - Deep editorial */
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #18181b;
    --bg-elevated: #1f1f23;

    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --text-muted: #52525b;

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-default: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.15);

    /* Principle colors - Saturated accents */
    --principle-A: #60a5fa; /* Data & Privacy - Cool blue */
    --principle-B: #f472b6; /* Security - Vibrant pink */
    --principle-C: #fbbf24; /* Safety - Warm amber */
    --principle-D: #a78bfa; /* Reliability - Soft purple */
    --principle-E: #34d399; /* Accountability - Fresh green */
    --principle-F: #fb923c; /* Society - Warm orange */

    /* Status colors */
    --status-mandatory: #ef4444;
    --status-optional: #6366f1;

    /* Typography */
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'Space Grotesk', system-ui, sans-serif;
    --font-mono: 'DM Mono', 'Fira Code', monospace;

    /* Spacing scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Transitions */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Noise texture overlay */
.noise-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ========================================
   Header
   ======================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 11, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--space-4) var(--space-8);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-section {
    display: flex;
    align-items: baseline;
    gap: var(--space-4);
}

.logo-mark {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: -0.02em;
    display: flex;
    align-items: baseline;
}

.logo-ai {
    color: var(--principle-B);
}

.logo-uc {
    color: var(--text-primary);
}

.logo-version {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.logo-tagline {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.header-nav {
    display: flex;
    gap: var(--space-6);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--text-primary);
}

/* ========================================
   Hero Section
   ======================================== */

.hero-section {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--space-16) var(--space-8) var(--space-12);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-16);
    align-items: end;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.title-line {
    display: block;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s var(--ease-out-expo) forwards;
}

.title-line-1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    color: var(--text-secondary);
    animation-delay: 0.1s;
}

.title-line-2 {
    font-size: clamp(3rem, 8vw, 6rem);
    color: var(--text-primary);
    animation-delay: 0.2s;
}

.title-line-3 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--text-tertiary);
    animation-delay: 0.3s;
}

.title-line-3 em {
    font-style: italic;
    color: var(--principle-C);
}

.hero-description {
    max-width: 540px;
    margin-top: var(--space-8);
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    opacity: 0;
    animation: fadeIn 0.8s var(--ease-out-expo) 0.5s forwards;
}

.hero-disclaimer {
    max-width: 540px;
    margin-top: var(--space-4);
    font-size: 0.875rem;
    color: var(--text-tertiary);
    line-height: 1.6;
    opacity: 0;
    animation: fadeIn 0.8s var(--ease-out-expo) 0.6s forwards;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-secondary);
    border-left: 2px solid var(--text-muted);
    border-radius: 0 6px 6px 0;
}

.hero-disclaimer a {
    color: var(--principle-B);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.hero-disclaimer a:hover {
    color: var(--text-primary);
}

.stats-grid {
    display: flex;
    gap: var(--space-1);
    opacity: 0;
    animation: fadeIn 0.8s var(--ease-out-expo) 0.6s forwards;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    padding: var(--space-5) var(--space-6);
    min-width: 100px;
    text-align: center;
    transition: all 0.3s var(--ease-out-quad);
}

.stat-card:first-child {
    border-radius: 8px 0 0 8px;
}

.stat-card:last-child {
    border-radius: 0 8px 8px 0;
}

.stat-card[data-principle="mandatory"] .stat-number {
    color: var(--status-mandatory);
}

.stat-card[data-principle="optional"] .stat-number {
    color: var(--status-optional);
}

.stat-card[data-principle="filtered"] .stat-number {
    color: var(--principle-E);
}

.stat-number {
    display: block;
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 500;
    line-height: 1;
}

.stat-label {
    display: block;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-top: var(--space-2);
}

/* ========================================
   Principles Navigation
   ======================================== */

.principles-nav {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 var(--space-8) var(--space-8);
}

.principles-header {
    margin-bottom: var(--space-4);
}

.section-label {
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-muted);
}

.principles-grid {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.principle-btn {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.25s var(--ease-out-quad);
}

.principle-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-default);
}

.principle-btn.active {
    background: var(--bg-elevated);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.principle-letter {
    font-family: var(--font-mono);
    font-weight: 500;
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: 4px;
    font-size: 0.75rem;
}

.principle-btn[data-principle="A"] .principle-letter { color: var(--principle-A); }
.principle-btn[data-principle="B"] .principle-letter { color: var(--principle-B); }
.principle-btn[data-principle="C"] .principle-letter { color: var(--principle-C); }
.principle-btn[data-principle="D"] .principle-letter { color: var(--principle-D); }
.principle-btn[data-principle="E"] .principle-letter { color: var(--principle-E); }
.principle-btn[data-principle="F"] .principle-letter { color: var(--principle-F); }

.principle-btn.active[data-principle="A"] { border-color: var(--principle-A); }
.principle-btn.active[data-principle="B"] { border-color: var(--principle-B); }
.principle-btn.active[data-principle="C"] { border-color: var(--principle-C); }
.principle-btn.active[data-principle="D"] { border-color: var(--principle-D); }
.principle-btn.active[data-principle="E"] { border-color: var(--principle-E); }
.principle-btn.active[data-principle="F"] { border-color: var(--principle-F); }

.principle-name {
    flex: 1;
}

.principle-count {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg-primary);
    padding: var(--space-1) var(--space-2);
    border-radius: 4px;
}

/* ========================================
   Filters Section
   ======================================== */

.filters-section {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 var(--space-8) var(--space-6);
    display: flex;
    gap: var(--space-6);
    align-items: flex-end;
    flex-wrap: wrap;
}

.search-container {
    flex: 1;
    min-width: 300px;
    position: relative;
}

.search-icon {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: var(--space-4) var(--space-4) var(--space-4) var(--space-12);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    transition: all 0.2s ease;
}

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

.search-input:focus {
    outline: none;
    border-color: var(--border-strong);
    background: var(--bg-tertiary);
}

.search-kbd {
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg-primary);
    padding: var(--space-1) var(--space-2);
    border-radius: 4px;
    border: 1px solid var(--border-subtle);
}

.filter-controls {
    display: flex;
    gap: var(--space-6);
    align-items: flex-end;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.filter-label {
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.toggle-group {
    display: flex;
    background: var(--bg-secondary);
    border-radius: 6px;
    padding: 2px;
}

.toggle-btn {
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.8125rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.toggle-btn:hover {
    color: var(--text-primary);
}

.toggle-btn.active {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.framework-select {
    padding: var(--space-3) var(--space-4);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    cursor: pointer;
    min-width: 160px;
}

.framework-select:focus {
    outline: none;
    border-color: var(--border-strong);
}

.export-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

/* ========================================
   Requirements Table
   ======================================== */

.requirements-section {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 var(--space-8) var(--space-16);
}

.table-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    overflow: hidden;
}

.requirements-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.requirements-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
}

.requirements-table th {
    background: var(--bg-tertiary);
    padding: var(--space-4) var(--space-5);
    text-align: left;
    font-weight: 500;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    border-bottom: 1px solid var(--border-default);
    white-space: nowrap;
}

.requirements-table th.sortable {
    cursor: pointer;
    user-select: none;
    transition: color 0.2s ease;
}

.requirements-table th.sortable:hover {
    color: var(--text-secondary);
}

.requirements-table th.sortable span {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.sort-icon {
    opacity: 0.3;
    transition: opacity 0.2s ease;
}

.sortable:hover .sort-icon,
.sortable.sorted .sort-icon {
    opacity: 1;
}

.col-id { width: 80px; }
.col-principle { width: 140px; }
.col-title { min-width: 280px; }
.col-status { width: 120px; }
.col-frequency { width: 130px; }
.col-frameworks { width: 200px; }

.requirements-table tbody tr {
    border-bottom: 1px solid var(--border-subtle);
    transition: background 0.15s ease;
    cursor: pointer;
}

.requirements-table tbody tr:hover {
    background: var(--bg-tertiary);
}

.requirements-table tbody tr:last-child {
    border-bottom: none;
}

.requirements-table td {
    padding: var(--space-4) var(--space-5);
    vertical-align: top;
}

.req-id {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.8125rem;
}

.req-id[data-principle="A"] { color: var(--principle-A); }
.req-id[data-principle="B"] { color: var(--principle-B); }
.req-id[data-principle="C"] { color: var(--principle-C); }
.req-id[data-principle="D"] { color: var(--principle-D); }
.req-id[data-principle="E"] { color: var(--principle-E); }
.req-id[data-principle="F"] { color: var(--principle-F); }

.principle-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    background: var(--bg-primary);
    border-radius: 4px;
    font-size: 0.75rem;
}

.principle-badge .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.principle-badge[data-principle="A"] .dot { background: var(--principle-A); }
.principle-badge[data-principle="B"] .dot { background: var(--principle-B); }
.principle-badge[data-principle="C"] .dot { background: var(--principle-C); }
.principle-badge[data-principle="D"] .dot { background: var(--principle-D); }
.principle-badge[data-principle="E"] .dot { background: var(--principle-E); }
.principle-badge[data-principle="F"] .dot { background: var(--principle-F); }

.req-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.req-description {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.status-badge.mandatory {
    background: rgba(239, 68, 68, 0.15);
    color: var(--status-mandatory);
}

.status-badge.optional {
    background: rgba(99, 102, 241, 0.15);
    color: var(--status-optional);
}

.effort-icon {
    margin-left: var(--space-2);
    font-size: 0.875rem;
    opacity: 0.9;
    cursor: help;
    vertical-align: middle;
}

.requirements-table td:nth-child(4) {
    white-space: nowrap;
}

.frequency-text {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.framework-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
}

.framework-tag {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    padding: 2px 6px;
    background: var(--bg-primary);
    border-radius: 3px;
    color: var(--text-muted);
    white-space: nowrap;
}

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

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease-out-quad);
}

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

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    width: 90%;
    max-width: 800px;
    max-height: 85vh;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 16px;
    z-index: 201;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease-out-expo);
    overflow: hidden;
}

.modal-overlay.active .modal {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.modal-close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 10;
}

.modal-close:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.modal-content {
    padding: var(--space-10);
    overflow-y: auto;
    max-height: 85vh;
}

.modal-header {
    margin-bottom: var(--space-8);
    padding-right: var(--space-10);
}

.modal-id {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--space-3);
}

.modal-id[data-principle="A"] { color: var(--principle-A); }
.modal-id[data-principle="B"] { color: var(--principle-B); }
.modal-id[data-principle="C"] { color: var(--principle-C); }
.modal-id[data-principle="D"] { color: var(--principle-D); }
.modal-id[data-principle="E"] { color: var(--principle-E); }
.modal-id[data-principle="F"] { color: var(--principle-F); }

.modal-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--space-4);
}

.modal-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.modal-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 0.8125rem;
}

.modal-badge svg {
    width: 14px;
    height: 14px;
    opacity: 0.6;
}

.effort-badge {
    font-size: 0.75rem;
}

.effort-low {
    background: rgba(52, 211, 153, 0.15);
    color: #34d399;
}

.effort-medium {
    background: rgba(251, 191, 36, 0.15);
    color: #fbbf24;
}

.effort-high {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.modal-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.modal-section {
    margin-top: var(--space-8);
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-subtle);
}

.modal-section-title {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    margin-bottom: var(--space-4);
}

.control-list {
    list-style: none;
}

.control-list li {
    position: relative;
    padding-left: var(--space-6);
    margin-bottom: var(--space-3);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.control-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
}

.control-list.should li::before {
    background: var(--principle-E);
}

.control-list.may li::before {
    background: var(--text-muted);
}

.framework-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--space-3);
}

.framework-card {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: var(--space-4);
}

.framework-card-title {
    font-weight: 500;
    font-size: 0.8125rem;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.framework-card-refs {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--text-tertiary);
    line-height: 1.6;
}

.keywords-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.keyword-tag {
    padding: var(--space-2) var(--space-3);
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.modal-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-6);
    padding: var(--space-3) var(--space-5);
    background: var(--bg-tertiary);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.modal-link:hover {
    background: var(--bg-elevated);
}

/* ========================================
   Getting Started Section
   ======================================== */

.getting-started {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: var(--space-6);
}

.getting-started-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--principle-E);
    margin-bottom: var(--space-5);
}

.getting-started-title svg {
    width: 16px;
    height: 16px;
}

.getting-started-overview {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-6);
}

/* Steps */
.getting-started-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.getting-started-step {
    display: flex;
    gap: var(--space-3);
}

.step-number {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: 50%;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--principle-E);
}

.step-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Tools */
.getting-started-tools {
    margin-bottom: var(--space-6);
}

.tools-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: var(--space-3);
}

.tools-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tool-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--bg-primary);
    border-radius: 6px;
    font-size: 0.8125rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s ease;
}

.tool-badge:hover {
    background: var(--bg-elevated);
}

.tool-type {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    text-transform: uppercase;
    padding: 2px 6px;
    border-radius: 3px;
}

.tool-type.free {
    background: rgba(52, 211, 153, 0.15);
    color: var(--principle-E);
}

.tool-type.paid {
    background: rgba(244, 114, 182, 0.15);
    color: var(--principle-B);
}

.tool-type.oss {
    background: rgba(96, 165, 250, 0.15);
    color: var(--principle-A);
}

/* Template */
.getting-started-template {
    margin-bottom: var(--space-6);
}

.template-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: var(--space-2);
}

.template-description {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    margin-bottom: var(--space-3);
}

.template-table-wrapper {
    overflow-x: auto;
    border-radius: 8px;
    background: var(--bg-primary);
}

.template-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.75rem;
}

.template-table th {
    background: var(--bg-secondary);
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
    border-bottom: 1px solid var(--border-subtle);
}

.template-table td {
    padding: var(--space-3) var(--space-4);
    color: var(--text-tertiary);
    white-space: nowrap;
    border-bottom: 1px solid var(--border-subtle);
}

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

/* Tip */
.getting-started-tip {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-4);
    background: rgba(251, 191, 36, 0.08);
    border-radius: 8px;
    border-left: 3px solid var(--principle-C);
}

.tip-icon {
    flex-shrink: 0;
    font-size: 1rem;
}

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

/* ========================================
   Footer
   ======================================== */

.site-footer {
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-secondary);
}

.footer-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--space-6) var(--space-8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.footer-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.footer-brand {
    font-weight: 500;
    color: var(--text-secondary);
}

.footer-divider {
    color: var(--text-muted);
}

.footer-right a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-right a:hover {
    color: var(--text-primary);
}

/* ========================================
   Animations
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.requirements-table tbody tr {
    animation: slideIn 0.3s var(--ease-out-quad) both;
}

.requirements-table tbody tr:nth-child(1) { animation-delay: 0.02s; }
.requirements-table tbody tr:nth-child(2) { animation-delay: 0.04s; }
.requirements-table tbody tr:nth-child(3) { animation-delay: 0.06s; }
.requirements-table tbody tr:nth-child(4) { animation-delay: 0.08s; }
.requirements-table tbody tr:nth-child(5) { animation-delay: 0.1s; }
.requirements-table tbody tr:nth-child(6) { animation-delay: 0.12s; }
.requirements-table tbody tr:nth-child(7) { animation-delay: 0.14s; }
.requirements-table tbody tr:nth-child(8) { animation-delay: 0.16s; }
.requirements-table tbody tr:nth-child(9) { animation-delay: 0.18s; }
.requirements-table tbody tr:nth-child(10) { animation-delay: 0.2s; }

/* ========================================
   Empty State
   ======================================== */

.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-6);
    opacity: 0.3;
}

.empty-state-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.empty-state-text {
    color: var(--text-tertiary);
}

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

@media (max-width: 1024px) {
    .hero-section {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .stats-grid {
        justify-content: flex-start;
    }

    .col-frameworks {
        display: none;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: var(--space-4);
    }

    .logo-tagline {
        display: none;
    }

    .hero-section {
        padding: var(--space-10) var(--space-4) var(--space-8);
    }

    .principles-nav,
    .filters-section,
    .requirements-section {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }

    .principles-grid {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: var(--space-2);
        -webkit-overflow-scrolling: touch;
    }

    .principle-btn {
        flex-shrink: 0;
    }

    .filters-section {
        flex-direction: column;
        gap: var(--space-4);
    }

    .search-container {
        min-width: 100%;
    }

    .filter-controls {
        width: 100%;
        flex-direction: column;
        gap: var(--space-4);
    }

    .filter-group {
        width: 100%;
    }

    .toggle-group {
        width: 100%;
        justify-content: space-between;
    }

    .framework-select {
        width: 100%;
    }

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

    .col-frequency,
    .col-principle {
        display: none;
    }

    .modal-content {
        padding: var(--space-6);
    }

    .modal-title {
        font-size: 1.5rem;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}

/* ========================================
   Scrollbar
   ======================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-elevated);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ========================================
   Selection
   ======================================== */

::selection {
    background: var(--principle-C);
    color: var(--bg-primary);
}