:root {
    --primary-color: #4f46e5;
    --auth-bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-color: #818cf8;
    --accent-color: #10b981;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #334155;
    --border-radius: 12px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: #f1f5f9;
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Navbar */
.navbar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1050;
}

.navbar-brand {
    font-weight: 700;
    color: var(--primary-color) !important;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-color) !important;
    margin: 0 0.5rem;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color) !important;
    background-color: rgba(79, 70, 229, 0.05);
}

/* Cards */
.card {
    background: var(--card-bg);
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-title {
    font-weight: 600;
    color: var(--dark-color);
}

/* Buttons */
.btn {
    border-radius: 8px;
    font-weight: 500;
    padding: 0.6rem 1.2rem;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 4px 6px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover {
    background-color: #4338ca;
    border-color: #4338ca;
    transform: translateY(-1px);
    box-shadow: 0 6px 8px rgba(79, 70, 229, 0.3);
}

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

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

/* Forms */
.form-control {
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    padding: 0.75rem 1rem;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.input-group .btn {
    z-index: 0;
}

/* Login Page Specifics */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 75vh;
    padding: 4rem 0;
}

.login-card {
    max-width: 450px;
    width: 100%;
    padding: 2.5rem;
    border-radius: 20px;
}

/* Search Section in Home */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    padding: 3rem;
    color: white;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-lg);
}

.hero-section h1 {
    font-weight: 800;
    margin-bottom: 1rem;
}

.hero-section .form-control {
    border: none;
    padding: 1rem;
    border-radius: 10px 0 0 10px;
}

.hero-section .btn {
    border-radius: 0 10px 10px 0;
    padding: 0 2rem;
    font-weight: 600;
    background-color: var(--dark-color);
    border: none;
}

.hero-section .btn:hover {
    background-color: #0f172a;
}

/* List Groups */
.list-group-item {
    border: none;
    margin-bottom: 0.5rem;
    border-radius: 8px !important;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.list-group-item:hover {
    transform: translateX(5px);
    background-color: #f8fafc;
}

/* Footer */
footer {
    background-color: var(--card-bg);
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid #e2e8f0;
    text-align: center;
    color: #64748b;
}

/* Animations */
.animate-fade-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }

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