/* ============================================================
   HRB Systems – Shared Design Tokens & Components
   Plain CSS · No frameworks · Mobile-first
   ============================================================ */

/* --- Reset & Base --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #0f1923;
    --color-surface: #1a2735;
    --color-surface-hover: #223345;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-text: #e4e8ec;
    --color-text-muted: #8a9bae;
    --color-heading: #ffffff;
    --color-accent: #3b82f6;
    --color-accent-glow: rgba(59, 130, 246, 0.25);
    --color-green: #22c55e;
    --color-amber: #f59e0b;
    --color-red: #ef4444;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.3);
    --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.4);
    --transition: 0.2s ease;
    --max-width: 960px;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- Typography --- */
h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-heading);
    line-height: 1.2;
}

h2 {
    font-size: 1.125rem;
    font-weight: 400;
    color: var(--color-text-muted);
    line-height: 1.4;
}

h3 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
}

/* --- Layout --- */
.page-wrapper {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* --- Top Nav Bar --- */
.top-nav {
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
}

.top-nav .page-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-heading);
    font-weight: 700;
    font-size: 1rem;
}

.nav-brand .brand-icon {
    width: 32px;
    height: 32px;
    background: var(--color-accent);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: #fff;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-heading);
    background: var(--color-surface);
}

.nav-link .link-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.nav-link .link-dot.green {
    background: var(--color-green);
}

.nav-link .link-dot.amber {
    background: var(--color-amber);
}

.nav-link .link-dot.purple {
    background: #a855f7;
}

/* --- Language Switcher --- */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 2px;
    margin-left: 8px;
    padding: 2px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
}

.lang-btn {
    padding: 4px 10px;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--color-text-muted);
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

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

.lang-btn.active {
    background: var(--color-accent);
    color: #fff;
}

/* --- Hero Section --- */
.hero {
    padding: 48px 0 32px;
    text-align: center;
}

.hero h1 {
    margin-bottom: 8px;
}

.hero h2 {
    max-width: 520px;
    margin: 0 auto;
}

.hero-logo {
    margin-top: 24px;
}

.hero-logo img {
    height: 56px;
    width: auto;
    border-radius: var(--radius-sm);
    transition: transform var(--transition);
}

.hero-logo img:hover {
    transform: scale(1.04);
}

/* --- Section Header --- */
.section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.section-header h3 {
    white-space: nowrap;
}

.section-header .line {
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

/* --- Card Grid --- */
.card-grid {
    display: grid;
    gap: 12px;
}

.card-grid.cols-2 {
    grid-template-columns: 1fr;
}

/* --- App Card --- */
.app-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.app-card:hover {
    background: var(--color-surface-hover);
    border-color: rgba(255, 255, 255, 0.14);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.app-card:active {
    transform: translateY(0);
}

.app-card .card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    object-fit: contain;
    flex-shrink: 0;
}

.app-card .card-emoji {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
    background: rgba(255, 255, 255, 0.06);
}

.app-card .card-body {
    flex: 1;
    min-width: 0;
}

.app-card .card-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-heading);
    line-height: 1.3;
}

.app-card .card-desc {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 2px;
    line-height: 1.4;
}

.app-card .card-arrow {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    flex-shrink: 0;
    transition: transform var(--transition), color var(--transition);
}

.app-card:hover .card-arrow {
    transform: translateX(3px);
    color: var(--color-accent);
}

/* --- Hub Card (used on the main index) --- */
.hub-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 28px 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.hub-card:hover {
    background: var(--color-surface-hover);
    border-color: rgba(255, 255, 255, 0.14);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-3px);
}

.hub-card .hub-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.hub-card .hub-icon.social {
    background: rgba(34, 197, 94, 0.15);
}

.hub-card .hub-icon.company {
    background: rgba(59, 130, 246, 0.15);
}

.hub-card .hub-icon.education {
    background: rgba(168, 85, 247, 0.15);
}

.hub-card .hub-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-heading);
}

.hub-card .hub-desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.hub-card .hub-footer {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-top: 4px;
}

.hub-card:hover .hub-footer span {
    transform: translateX(3px);
}

.hub-card .hub-footer span {
    transition: transform var(--transition);
    display: inline-block;
}

/* --- Featured Card --- */
.featured-card {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 20px;
    padding: 14px;
    overflow: hidden;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.featured-card:hover {
    background: var(--color-surface-hover);
    border-color: rgba(255, 255, 255, 0.14);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.featured-img {
    width: 160px;
    height: 160px;
    flex-shrink: 0;
    border-radius: var(--radius-md);
    object-fit: cover;
}

.featured-body {
    flex: 1;
    min-width: 0;
}

.featured-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-heading);
    line-height: 1.3;
}

.featured-desc {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 4px;
    line-height: 1.4;
}

.featured-cta {
    display: inline-block;
    margin-top: 10px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-accent);
    transition: transform var(--transition);
}

.featured-card:hover .featured-cta {
    transform: translateX(4px);
}

@media (max-width: 639px) {
    .featured-card {
        flex-direction: column;
    }
    .featured-img {
        width: 100%;
        height: auto;
        max-height: 200px;
    }
}

/* --- Section spacing --- */
.section {
    margin-bottom: 32px;
}

/* --- Footer --- */
.site-footer {
    margin-top: auto;
    padding: 24px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.site-footer p {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* --- Breadcrumb --- */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 20px 0 0;
    font-size: 0.8125rem;
}

.breadcrumb a {
    color: var(--color-accent);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb .sep {
    color: var(--color-text-muted);
}

.breadcrumb .current {
    color: var(--color-text-muted);
}

/* --- Status Badge --- */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.status-badge.live {
    background: rgba(34, 197, 94, 0.12);
    color: var(--color-green);
}

.status-badge .pulse {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (min-width: 640px) {
    .card-grid.cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }

    h1 {
        font-size: 2.5rem;
    }

    .hero {
        padding: 64px 0 40px;
    }
}

@media (min-width: 768px) {
    .page-wrapper {
        padding: 0 32px;
    }
}