/* ==========================================================================
   VU Study Groups - Premium Modern & Minimalist Style Sheet
   ========================================================================== */

:root {
    --primary: #4f46e5;
    /* Indigo */
    --primary-hover: #4338ca;
    /* Deep Indigo */
    --primary-light: #e0e7ff;
    /* Light Indigo */
    --whatsapp: #25d366;
    /* WhatsApp Green */
    --whatsapp-hover: #1da851;
    --secondary: #0ea5e9;
    /* Sky Blue */
    --success: #10b981;
    /* Emerald */
    --warning: #f59e0b;
    /* Amber */
    --danger: #ef4444;
    /* Red */
    --dark: #0f172a;
    /* Slate 900 */
    --light: #f8fafc;
    /* Slate 50 */
    --text-main: #1e293b;
    /* Slate 800 */
    --text-muted: #64748b;
    /* Slate 500 */
    --border-color: #e2e8f0;
    /* Slate 200 */
    --card-bg: #ffffff;
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius: 12px;
}

/* ===== Global Reset & Defaults ===== */
body {
    background-color: var(--light);
    font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
}

/* ===== Scrollbar Styling ===== */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* ===== Header/Navbar ===== */
.navbar {
    background: rgba(15, 23, 42, 0.9) !important;
    /* Dark Slate transparent */
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 16px 0;
    transition: var(--transition);
}

.nav-link {
    color: #cbd5e1 !important;
    font-weight: 500;
    padding: 8px 16px !important;
    border-radius: 8px;
    margin: 0 2px;
}

.nav-link:hover {
    color: #ffffff !important;
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    color: #ffffff !important;
    background: rgba(79, 70, 229, 0.15) !important;
}

/* ===== Buttons ===== */
.btn {
    font-weight: 600;
    padding: 10px 20px;
    border-radius: 8px;
    transition: var(--transition);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

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

.btn-success {
    background-color: var(--whatsapp);
    border-color: var(--whatsapp);
    color: #ffffff;
}

.btn-success:hover {
    background-color: var(--whatsapp-hover);
    border-color: var(--whatsapp-hover);
}

.btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline-primary:hover {
    background-color: var(--primary);
    color: #ffffff;
}

.btn-light {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-light:hover {
    background-color: var(--light);
}

/* ===== Hero Section ===== */
.vu-hero {
    background: radial-gradient(circle at 10% 20%, rgba(79, 70, 229, 0.05) 0%, rgba(14, 165, 233, 0.05) 90%), #ffffff;
    border-bottom: 1px solid var(--border-color);

    text-align: center;
    color: var(--text-main) !important;
    margin-bottom: 30px;
}

.vu-hero h1,
.vu-hero h2 {
    color: var(--dark) !important;
    font-weight: 800;
    letter-spacing: -1px;
}

.vu-info-box {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 20px;
    box-shadow: var(--shadow-sm);
    display: inline-block;
    max-width: 600px;
}

/* ===== Cards (Study Group Grid) ===== */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(79, 70, 229, 0.3);
}

.card-title {
    color: var(--dark);
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.3px;
}

.card-subtitle {
    color: var(--text-muted);
}

.card-text {
    color: var(--text-muted);
    font-size: 0.925rem;
    line-height: 1.6;
}

/* Badges */
.badge {
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 6px;
}

.bg-primary-light {
    background-color: var(--primary-light);
    color: var(--primary);
}

.bg-success-light {
    background-color: #d1fae5;
    color: #065f46;
}

/* ===== Search Area ===== */
.search-container {
    max-width: 650px;
    position: relative;
    z-index: 10;
    margin-top: 5px;
}

.search-container .input-group {
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.search-container .form-control {
    border: none;
    font-size: 1rem;
    font-weight: 500;
    padding: 16px 24px;
}

.search-container .form-control:focus {
    box-shadow: none;
}

.search-container .input-group-text {
    background-color: #ffffff;
    border: none;
    padding-left: 24px;
    color: var(--text-muted);
}

.search-container .btn {
    border: none;
    font-weight: 600;
    padding: 12px 24px;
}

/* ===== Floating Action Button ===== */
.whatsapp-float {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--whatsapp);
    color: #ffffff !important;
    border-radius: 50px;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 10px 25px -5px rgba(37, 211, 102, 0.4);
    z-index: 1000;
    animation: floatPulse 3s infinite ease-in-out;
}

.whatsapp-float:hover {
    background-color: var(--whatsapp-hover);
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 12px 28px -5px rgba(37, 211, 102, 0.5);
}

.whatsapp-float i {
    font-size: 1.5rem;
}

.whatsapp-label {
    font-size: 0.875rem;
    font-weight: 700;
}

/* ===== Footer ===== */
.vu-footer {
    background: var(--dark);
    color: #94a3b8;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 48px 0;
    font-size: 0.925rem;
}

.vu-footer h5 {
    color: #ffffff;
    font-weight: 700;
}

.footer-link {
    color: #94a3b8;
    text-decoration: none;
    margin: 0 12px;
    transition: var(--transition);
}

.footer-link:hover {
    color: #ffffff;
}

.footer-social {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    color: #cbd5e1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: var(--transition);
}

.footer-social:hover {
    background: var(--primary);
    color: #ffffff;
    transform: translateY(-3px);
}

/* ===== Tables & Dashboards ===== */
.table {
    background-color: #ffffff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border-collapse: separate;
    border-spacing: 0;
}

.table th {
    background-color: #f1f5f9;
    border-bottom: 2px solid var(--border-color);
    color: var(--dark);
    font-weight: 700;
    padding: 16px;
}

.table td {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    vertical-align: middle;
}

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

/* ===== Animations ===== */
@keyframes floatPulse {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-6px);
    }
}

/* ===== Responsive Adaptations ===== */
@media (max-width: 768px) {
    .vu-hero {
        padding: 40px 0;
    }

    .search-container {
        margin: -30px 15px 30px;
    }

    .whatsapp-float {
        bottom: 20px;
        right: 20px;
        padding: 12px;
        border-radius: 50%;
    }

    .whatsapp-label {
        display: none;
    }
}