/* ─── DESIGN TOKENS ───────────────────────────────────────── */
:root {
    --sky-deep:    #0B1D2E;
    --sky-mid:     #1A3A5C;
    --sky-pale:    #4A7FA5;
    --cloud-white: #EEF4F9;
    --horizon:     #B8CDD8;
    --aurora:      #7EC8C8;
    --mist:        #D9E8EF;
    --slate:       #3D5A6E;
    --contrast:    #061420;

    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-mono:    'DM Mono', 'Courier New', monospace;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
}

/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Prevent layout shift - reserve space for web fonts */
body {
    font-family: var(--font-display);
    font-weight: 300;
    line-height: 1.7;
    color: var(--cloud-white);
    background: var(--sky-deep);
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* Prevent CLS for images */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Navigation */
nav {
    background: var(--sky-mid);
    border-bottom: 1px solid var(--slate);
    padding: 0.75rem 1.5rem;
    margin: -1rem -1rem 2rem -1rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.nav-logo {
    display: flex;
    align-items: center;
    margin-right: 1rem;
    text-decoration: none;
}

nav a {
    color: var(--horizon);
    text-decoration: none;
    margin-right: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    transition: color 0.2s;
}

nav a:hover {
    color: var(--aurora);
    text-decoration: none;
}

/* Typography */
h1 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 300;
    letter-spacing: 0.04em;
    margin-bottom: 1rem;
    color: var(--cloud-white);
}

h2 {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--horizon);
    margin-bottom: var(--space-sm);
}

/* Provider Grid */
.provider-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.provider-card {
    border: 1px solid var(--slate);
    border-radius: 4px;
    padding: 1.5rem;
    background: var(--sky-mid);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

@media (prefers-reduced-motion: no-preference) {
    .provider-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 20px rgba(0,0,0,0.3);
    }
}

.provider-card h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 400;
    letter-spacing: 0.03em;
    text-transform: none;
    color: var(--cloud-white);
    margin-bottom: 0.5rem;
}

.provider-card h2 a {
    color: var(--cloud-white);
    text-decoration: none;
}

.provider-card h2 a:hover {
    color: var(--aurora);
}

.provider-description {
    margin: 0.5rem 0 1rem 0;
    color: var(--horizon);
    font-size: 0.95rem;
}

.provider-meta {
    font-size: 0.88rem;
    color: var(--horizon);
}

.provider-meta p {
    margin: 0.5rem 0;
}

.provider-meta strong {
    color: var(--cloud-white);
    font-weight: 400;
}

.provider-card .provider-actions {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--slate);
}

.btn-compare-add {
    width: 100%;
    padding: 0.6rem 1rem;
    background: transparent;
    color: var(--aurora);
    border: 1px solid var(--aurora);
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 400;
    transition: background 0.2s, color 0.2s;
}

.btn-compare-add:hover {
    background: var(--aurora);
    color: var(--contrast);
}

.btn-compare-add.in-comparison {
    background: var(--aurora);
    color: var(--contrast);
    border-color: var(--aurora);
}

.btn-compare-add.in-comparison:hover {
    background: var(--sky-pale);
    border-color: var(--sky-pale);
    color: var(--cloud-white);
}

.btn-compare-add:disabled {
    background: transparent;
    color: var(--slate);
    border-color: var(--slate);
    cursor: not-allowed;
}

/* Badges */
.badge {
    display: inline-block;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--slate);
    color: var(--horizon);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    margin-right: 0.25rem;
    letter-spacing: 0.05em;
}

.cert-badge {
    background: rgba(126,200,200,0.12);
    border-color: var(--aurora);
    color: var(--aurora);
}

/* Filters Container */
.filters-container {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--slate);
    padding: 1.5rem;
    border-radius: 4px;
    margin: 2rem 0;
}

.filters-container h2 {
    font-size: 0.7rem;
    margin-bottom: 1rem;
}

.search-container {
    margin-bottom: 1.5rem;
}

.search-container label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--horizon);
    margin-bottom: 0.5rem;
}

.search-input {
    width: 100%;
    padding: 0.6rem 1rem;
    background: var(--sky-deep);
    border: 1px solid var(--slate);
    border-radius: 4px;
    color: var(--cloud-white);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 300;
    outline: none;
    transition: border-color 0.2s;
}

.search-input:focus {
    border-color: var(--aurora);
}

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

.filter-group {
    margin-bottom: 1.5rem;
    border: none;
    padding: 0;
}

.filter-group legend {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    color: var(--horizon);
    padding: 0;
}

.filter-group label {
    display: block;
    margin: 0.5rem 0;
    cursor: pointer;
    color: var(--cloud-white);
    font-size: 0.95rem;
}

.filter-group label input[type="checkbox"] {
    margin-right: 0.5rem;
    accent-color: var(--aurora);
}

.filter-checkbox:checked + label,
.filter-group label:has(input:checked) {
    font-weight: 400;
    color: var(--aurora);
}

.filter-reset {
    background: transparent;
    color: var(--aurora);
    border: 1px solid var(--aurora);
    padding: 0.6rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: background 0.2s, color 0.2s;
}

.filter-reset:hover {
    background: var(--aurora);
    color: var(--contrast);
}

.filter-reset:focus {
    outline: 3px solid var(--aurora);
    outline-offset: 2px;
}

/* Result Count */
.result-count {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--horizon);
    margin: 1rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    .provider-grid {
        grid-template-columns: 1fr;
    }
    
    body {
        padding: 0.5rem;
    }
    
    /* Collapsible filters on mobile */
    .filters-container {
        position: relative;
    }
    
    .filters-toggle {
        display: block;
        width: 100%;
        padding: 0.75rem 1rem;
        background: transparent;
        color: var(--aurora);
        border: 1px solid var(--aurora);
        border-radius: 4px;
        font-family: var(--font-mono);
        font-size: 0.72rem;
        letter-spacing: 0.12em;
        text-transform: uppercase;
        cursor: pointer;
        margin-bottom: 1rem;
        transition: background 0.2s, color 0.2s;
    }

    .filters-toggle:hover {
        background: var(--aurora);
        color: var(--contrast);
    }
    
    .filters-content {
        display: none;
    }
    
    .filters-content.open {
        display: block;
    }
    
    /* Touch-friendly buttons */
    .btn,
    .filter-checkbox,
    .lang-btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .filter-group label {
        padding: 0.5rem 0;
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    /* Mobile navigation */
    nav {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    nav a {
        margin-right: 0.5rem;
    }
    
    /* Comparison bar on mobile */
    .comparison-bar {
        padding: 0.5rem;
    }
    
    .comparison-item {
        font-size: 0.9rem;
    }
}

/* Provider Detail Page */
.provider-detail {
    max-width: 900px;
    margin: 0 auto;
}

.provider-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--slate);
}

.provider-tagline {
    font-size: 1.2rem;
    font-weight: 300;
    color: var(--horizon);
    margin-top: 0.5rem;
}

.provider-meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
    padding: 1.5rem;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--slate);
    border-radius: 4px;
}

.meta-item {
    display: flex;
    flex-direction: column;
}

.meta-item strong {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--horizon);
    font-weight: 400;
    margin-bottom: 0.25rem;
}

.meta-item span {
    color: var(--cloud-white);
    font-size: 1rem;
}

.external-link {
    color: var(--aurora);
    text-decoration: none;
    text-underline-offset: 3px;
}

.external-link:hover {
    color: var(--cloud-white);
    text-decoration: underline;
}

.external-icon {
    font-size: 0.85em;
    margin-left: 0.25rem;
}

.provider-detail section {
    margin: 3rem 0;
}

.provider-detail h2 {
    color: var(--horizon);
    margin-bottom: 0.75rem;
}

.section-intro {
    color: var(--horizon);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
}

.provider-description .content {
    line-height: 1.9;
    font-size: 1.05rem;
    color: var(--cloud-white);
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
}

.service-card {
    background: rgba(74,127,165,0.15);
    border: 1px solid var(--sky-pale);
    color: var(--cloud-white);
    padding: 0.75rem 1rem;
    border-radius: 4px;
    text-align: center;
}

.service-name {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* Certifications */
.certifications-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.certification-badge {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: rgba(126,200,200,0.06);
    border-left: 3px solid var(--aurora);
    border-radius: 4px;
}

.cert-icon {
    font-size: 1.5rem;
    color: var(--aurora);
}

.cert-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.cert-name {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    color: var(--aurora);
}

.cert-link {
    color: var(--horizon);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.05em;
}

.cert-link:hover {
    color: var(--aurora);
    text-decoration: underline;
}

/* Datacenters */
.datacenters-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.datacenter-item {
    padding: 1rem;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--slate);
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--cloud-white);
}

.location-icon {
    font-size: 1.25rem;
}

/* Provider Actions */
.provider-actions {
    display: flex;
    gap: 1rem;
    margin: 3rem 0;
    padding-top: 2rem;
    border-top: 1px solid var(--slate);
}

.btn {
    padding: 0.7rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 400;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn-primary {
    background: var(--aurora);
    color: var(--contrast);
    border-color: var(--aurora);
}

.btn-primary:hover {
    background: var(--sky-pale);
    border-color: var(--sky-pale);
    color: var(--cloud-white);
}

.btn-secondary {
    background: transparent;
    color: var(--horizon);
    border-color: var(--slate);
}

.btn-secondary:hover {
    border-color: var(--horizon);
    color: var(--cloud-white);
}

@media (max-width: 768px) {
    .provider-actions {
        flex-direction: column;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .provider-meta-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-table-wrapper {
        position: relative;
    }
    
    /* Sticky first column in comparison table */
    .comparison-table thead th:first-child,
    .comparison-table tbody th:first-child {
        position: sticky;
        left: 0;
        z-index: 10;
        background: var(--sky-mid);
        box-shadow: 2px 0 4px rgba(0,0,0,0.3);
    }
    
    .comparison-table thead th {
        position: sticky;
        top: 0;
        z-index: 11;
    }
    
    .comparison-table thead th:first-child {
        z-index: 12;
    }
}

/* Comparison Bar */
.comparison-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--sky-mid);
    border-top: 2px solid var(--aurora);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.4);
    padding: 1rem;
    z-index: 1000;
    display: none;
}

.comparison-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.comparison-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.comparison-counter {
    background: var(--aurora);
    color: var(--contrast);
    padding: 0.25rem 0.6rem;
    border-radius: 50%;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: bold;
}

.btn-clear-comparison {
    background: transparent;
    border: 1px solid var(--slate);
    color: var(--horizon);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transition: border-color 0.2s, color 0.2s;
}

.btn-clear-comparison:hover {
    border-color: var(--horizon);
    color: var(--cloud-white);
}

.comparison-list {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    flex: 1;
}

.comparison-item {
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--slate);
    color: var(--cloud-white);
    padding: 0.4rem 0.75rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.remove-comparison {
    background: transparent;
    color: var(--aurora);
    border: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.remove-comparison:hover {
    color: var(--cloud-white);
}

.btn-compare {
    background: var(--aurora);
    color: var(--contrast);
    padding: 0.7rem 1.5rem;
    border: 1px solid var(--aurora);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 400;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.2s, color 0.2s;
}

.btn-compare:hover {
    background: var(--sky-pale);
    border-color: var(--sky-pale);
    color: var(--cloud-white);
}

.in-comparison {
    background: var(--aurora) !important;
    color: var(--contrast) !important;
}

.in-comparison:hover {
    background: var(--sky-pale) !important;
}

@media (max-width: 768px) {
    .comparison-content {
        flex-direction: column;
        align-items: stretch;
    }
}

/* Language Switcher */
.language-switcher {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-btn {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--horizon);
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: all 0.2s;
}

.lang-btn:hover {
    border-color: var(--aurora);
    color: var(--aurora);
}

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

.lang-btn.active {
    background: var(--aurora);
    color: var(--contrast);
    border-color: var(--aurora);
}

.lang-separator {
    color: var(--slate);
    font-family: var(--font-mono);
    font-size: 0.7rem;
}

/* Skip Navigation Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--aurora);
    color: var(--contrast);
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    z-index: 9999;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 0;
}

/* Focus Indicators */
:focus-visible {
    outline: 3px solid var(--aurora);
    outline-offset: 4px;
}

a {
    color: var(--aurora);
    text-underline-offset: 3px;
}

a:hover {
    color: var(--cloud-white);
}

/* Home Page Styles */
.home-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.home-content .tagline {
    font-size: 1.15rem;
    color: var(--horizon);
    margin-bottom: 2rem;
    font-weight: 300;
}

.home-content .content {
    text-align: left;
    margin: 3rem auto;
    color: var(--cloud-white);
}

.home-content h2 {
    margin-top: 2rem;
    color: var(--horizon);
}

.home-content ul {
    list-style: none;
    padding: 0;
}

.home-content ul li {
    margin: 1rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--cloud-white);
    font-size: 1rem;
}

.home-content ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--aurora);
    font-family: var(--font-mono);
}

.home-content .btn {
    display: inline-block;
    margin-top: 2rem;
    padding: 0.85rem 2rem;
    background: var(--aurora);
    color: var(--contrast);
    text-decoration: none;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 400;
    border: 1px solid var(--aurora);
    transition: background 0.2s, color 0.2s;
}

.home-content .btn:hover {
    background: var(--sky-pale);
    border-color: var(--sky-pale);
    color: var(--cloud-white);
}

/* Screen reader only — visually hidden but accessible to assistive technologies */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Footer landmark */
.site-footer {
    margin-top: auto;
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--horizon);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--mist);
    letter-spacing: 0.05em;
}

.site-footer a {
    color: var(--aurora);
    text-decoration: underline;
}

.site-footer a:hover {
    text-decoration: underline;
}

.comparison-error {
    color: var(--terra, #c0392b);
    padding: 1rem 0;
}

.not-found {
    text-align: center;
    padding: 4rem 2rem;
}

.not-found h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--cloud-white);
}

.not-found p {
    color: var(--mist);
    margin-bottom: 2rem;
}