:root {
    /* Color Palette - Premium Light Theme */
    --bg-dark: #F8FAFC; /* Soft slate gray background */
    --bg-card: #FFFFFF; /* Pure white cards */
    --bg-card-hover: #FFFFFF;
    --text-primary: #0F172A; /* Deep charcoal slate */
    --text-secondary: #64748B; /* Medium slate */
    --border-color: rgba(0, 0, 0, 0.08); /* Very soft gray border */
    
    --accent-blue: #2563EB;
    --accent-purple: #7C3AED;
    --accent-teal: #0F766E;
    --accent-rose: #E11D48;
    --accent-indigo: #4F46E5;
    --accent-orange: #EA580C;

    --font-main: 'Outfit', -apple-system, sans-serif;
    
    /* Layout */
    --border-radius-lg: 16px;
    --border-radius-md: 10px;
    --border-radius-sm: 6px;
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

/* Background effects */
.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(140px);
    z-index: 0;
    opacity: 0.12; /* Subtle light glows */
    pointer-events: none;
}
.glow-1 {
    top: -10%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: var(--accent-blue);
}
.glow-2 {
    bottom: -20%;
    right: -10%;
    width: 800px;
    height: 800px;
    background: var(--accent-purple);
}

.wrapper {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* Header */
.hub-header {
    padding: 80px 0 40px;
    text-align: center;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.logo-mark {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 800;
    color: white;
    box-shadow: 0 8px 16px rgba(59, 130, 246, 0.25);
}

.brand-text h1 {
    font-size: 42px;
    font-weight: 700;
    letter-spacing: -1px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.badge {
    font-size: 14px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 20px;
    background: rgba(0, 0, 0, 0.05); /* Light badge */
    border: 1px solid rgba(0, 0, 0, 0.08); /* Light border */
    color: var(--text-primary);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto;
    font-weight: 500;
}

/* Filters */
.filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 48px;
}

.filter-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 30px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-btn:hover {
    color: var(--text-primary);
    background: #F1F5F9;
    border-color: rgba(0,0,0,0.1);
}

.filter-btn.active {
    background: var(--text-primary);
    color: #FFFFFF; /* High contrast white text */
    border-color: var(--text-primary);
}

/* Grid layout */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 32px;
    padding-bottom: 60px;
}

/* Project Card */
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02), 0 2px 4px -1px rgba(0, 0, 0, 0.01); /* Soft default shadow */
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--card-color, var(--accent-blue));
    opacity: 0.9;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.04); /* Airy large shadow */
    border-color: rgba(0, 0, 0, 0.12);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.project-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-md);
    background: rgba(0, 0, 0, 0.04); /* Subtle gray background */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--card-color, #0F172A);
}

.project-status {
    font-size: 12px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 12px;
    background: rgba(13, 148, 136, 0.1); /* Darker teal for light backgrounds */
    color: var(--accent-teal);
    display: flex;
    align-items: center;
    gap: 6px;
}
.project-status::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 6px rgba(13, 148, 136, 0.4);
}

.project-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.project-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    flex-grow: 1;
}

/* Login Roles List */
.roles-container {
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}

.roles-title {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 700;
}

.roles-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.role-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 12px 16px;
    background: #F8FAFC; /* Soft button bg */
    border: 1px solid #E2E8F0; /* Visible static border */
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.role-btn:hover {
    background: #FFFFFF; /* Brighten on hover */
    border-color: #CBD5E1; /* Darken border slightly */
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.role-btn svg {
    width: 16px;
    height: 16px;
    opacity: 0.4;
    transition: var(--transition-fast);
}

.role-btn:hover svg {
    opacity: 1;
    transform: translateX(4px);
    color: var(--card-color, #0F172A);
}

/* Footer */
.hub-footer {
    margin-top: auto;
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

/* Writeup Modal */
.writeup-modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-smooth);
}

.writeup-modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.writeup-modal-content {
    background: var(--bg-card);
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    display: flex;
    flex-direction: column;
    transform: translateY(20px) scale(0.95);
    transition: transform var(--transition-smooth);
    overflow: hidden;
}

.writeup-modal-overlay.active .writeup-modal-content {
    transform: translateY(0) scale(1);
}

.writeup-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 32px;
    border-bottom: 1px solid var(--border-color);
    background: #F8FAFC;
}

.writeup-modal-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.writeup-modal-title h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.project-icon-small {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.writeup-modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
}

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

.writeup-modal-body {
    padding: 32px;
    overflow-y: auto;
    font-size: 16px;
    color: #334155;
    line-height: 1.7;
}

.writeup-modal-body h3 {
    margin-top: 24px;
    margin-bottom: 12px;
    font-size: 18px;
    color: var(--text-primary);
    font-weight: 700;
}
.writeup-modal-body h3:first-child { margin-top: 0; }
.writeup-modal-body p { margin-bottom: 16px; }
.writeup-modal-body ul { margin-bottom: 16px; padding-left: 24px; }
.writeup-modal-body li { margin-bottom: 8px; }

/* Info Button on Cards */
.writeup-trigger-btn {
    background: rgba(0,0,0,0.03);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    transition: var(--transition-fast);
}
.writeup-trigger-btn:hover {
    background: var(--text-primary);
    color: white;
    border-color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .brand-text h1 {
        font-size: 32px;
    }
    .project-grid {
        grid-template-columns: 1fr;
    }
    .writeup-modal-content {
        max-height: 95vh;
    }
    .writeup-modal-body {
        padding: 24px;
    }
}