:root {
    /* PALET WARNA HIJAU MODERN */
    --green-primary: #10B981;      /* Hijau utama - modern & fresh */
    --green-dark: #059669;         /* Hijau gelap untuk hover */
    --green-light: #D1FAE5;        /* Hijau sangat muda untuk background */
    --green-accent: #34D399;       /* Hijau aksen */
    
    /* PALET WARNA ABU-ABU */
    --gray-50: #F9FAFB;            /* Abu-abu sangat muda */
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;           /* Abu-abu muda untuk border */
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;           /* Abu-abu medium */
    --gray-500: #6B7280;
    --gray-600: #4B5563;           /* Abu-abu gelap */
    --gray-700: #374151;
    --gray-800: #1F2937;           /* Abu-abu sangat gelap */
    
    /* PALET WARNA HITAM */
    --black-soft: #111827;         /* Hitam lembut untuk teks */
    --black-rich: #000000;         /* Hitam murni */
    
    /* WARNA TEKS DENGAN KONTRA TINGGI */
    --text-primary: var(--black-soft);     /* Teks utama hitam soft */
    --text-secondary: var(--gray-700);     /* Teks sekunder abu gelap */
    --text-muted: var(--gray-500);         /* Teks muted abu medium */
    --text-light: #FFFFFF;                 /* Teks putih untuk background gelap */
    
    /* WARNA BACKGROUND */
    --bg-primary: #FFFFFF;                 /* Background utama putih */
    --bg-secondary: var(--gray-50);        /* Background sekunder abu muda */
    --bg-accent: var(--green-light);       /* Background aksen hijau muda */
    --bg-dark: var(--gray-800);            /* Background gelap abu tua */
    --bg-darker: var(--black-soft);        /* Background lebih gelap */
    
    /* GRADIENT */
    --gradient-green: linear-gradient(135deg, var(--green-primary) 0%, var(--green-dark) 100%);
    --gradient-dark: linear-gradient(135deg, var(--gray-800) 0%, var(--black-soft) 100%);
    --gradient-gray: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-50) 100%);
    
    /* BORDER DAN SHADOW */
    --border-light: var(--gray-200);
    --border-medium: var(--gray-300);
    --border-dark: var(--gray-400);
    --border-green: var(--green-primary);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.15);
    --shadow-green: 0 10px 25px -5px rgba(16, 185, 129, 0.2);
    --shadow-dark: 0 10px 30px -5px rgba(0, 0, 0, 0.25);
    
    /* RADIUS KONSISTEN */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* SPACING SYSTEM */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
}

/* ========== RESET & BASE STYLES ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== NAVBAR ========== */
.navbar {
    background: var(--bg-darker) !important;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-dark);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--green-primary) !important;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    transition: all 0.3s ease;
}

.navbar-brand:hover {
    color: var(--green-accent) !important;
    transform: translateY(-1px);
}

.navbar-brand i {
    color: var(--green-primary);
    font-size: 1.3em;
}

.navbar-toggler {
    border: 1px solid var(--gray-600);
    color: var(--green-primary);
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.25);
}

.nav-link {
    color: var(--gray-400) !important;
    font-weight: 500;
    padding: var(--space-xs) var(--space-md) !important;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    margin: 0 var(--space-xs);
    position: relative;
}

.nav-link:hover {
    color: var(--green-primary) !important;
    background: rgba(16, 185, 129, 0.1);
    transform: translateY(-1px);
}

.nav-link.active {
    color: var(--green-primary) !important;
    background: rgba(16, 185, 129, 0.15);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--green-primary);
    border-radius: var(--radius-full);
}

.btn-outline-light {
    border: 2px solid var(--gray-600);
    color: var(--gray-300);
    transition: all 0.3s ease;
}

.btn-outline-light:hover {
    border-color: var(--green-primary);
    color: var(--green-primary);
    background: transparent;
    transform: translateY(-2px);
}

/* ========== HERO SECTION ========== */
.hero-section {
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--black-soft) 100%);
    color: var(--text-light);
    padding: var(--space-3xl) 0 var(--space-2xl);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.05) 0%, transparent 50%);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: var(--space-md);
    line-height: 1.1;
    letter-spacing: -0.025em;
}

.hero-title span {
    background: linear-gradient(135deg, var(--green-primary) 0%, var(--green-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-300);
    margin-bottom: var(--space-xl);
    max-width: 600px;
    line-height: 1.6;
}

.hero-section img {
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-dark);
    border: 2px solid var(--gray-700);
    transition: all 0.4s ease;
}

.hero-section img:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--green-primary);
}

/* ========== SEARCH SECTION ========== */
.search-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--space-xl);
    margin-top: -100px;
    position: relative;
    z-index: 10;
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

.search-section:hover {
    border-color: var(--green-primary);
    box-shadow: var(--shadow-green);
    transform: translateY(-5px);
}

.search-section h3 {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    position: relative;
    padding-bottom: var(--space-sm);
}

.search-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-green);
    border-radius: var(--radius-full);
}

.form-label {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: var(--space-xs);
}

.form-select, .form-control {
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: all 0.3s ease;
}

.form-select:focus, .form-control:focus {
    border-color: var(--green-primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
    outline: none;
}

/* ========== BUTTONS ========== */
.btn {
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.7s;
}

.btn:hover::after {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-green);
    color: white;
    border: none;
    box-shadow: var(--shadow-green);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px -10px rgba(16, 185, 129, 0.3);
    background: linear-gradient(135deg, var(--green-dark) 0%, var(--green-primary) 100%);
}

.btn-outline-primary {
    background: transparent;
    color: var(--green-primary);
    border: 2px solid var(--green-primary);
}

.btn-outline-primary:hover {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--green-dark);
    border-color: var(--green-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn i {
    font-size: 0.9em;
}

/* ========== KAMPUS INFO ========== */
.kampus-info {
    background: var(--gradient-gray);
    padding: var(--space-2xl) 0;
    position: relative;
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
}

.kampus-logo {
    width: 120px;
    height: 120px;
    background: var(--gradient-green);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-lg);
    color: white;
    font-size: 2.5rem;
    box-shadow: var(--shadow-green);
    border: 4px solid white;
    transition: all 0.3s ease;
}

.kampus-logo:hover {
    transform: rotate(10deg) scale(1.1);
    box-shadow: 0 20px 40px -10px rgba(16, 185, 129, 0.3);
}

.kampus-info h2 {
    color: var(--text-primary);
    font-weight: 800;
    margin-bottom: var(--space-md);
}

.kampus-info .lead {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

.kampus-info .col-md-4 {
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.kampus-info .col-md-4 i {
    color: var(--green-primary);
    font-size: 1.1em;
}

/* ========== SECTION STYLES ========== */
.section-title {
    text-align: center;
    margin-bottom: var(--space-xl);
    position: relative;
    color: var(--text-primary);
    font-weight: 800;
    font-size: 2.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-green);
    border-radius: var(--radius-full);
}

/* ========== FEATURES SECTION ========== */
.py-5 {
    padding-top: var(--space-2xl) !important;
    padding-bottom: var(--space-2xl) !important;
}

.bg-light {
    background-color: var(--bg-secondary) !important;
}

.feature-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    height: 100%;
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--green-primary);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--green-light) 100%);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--green-light);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-lg);
    color: var(--green-primary);
    font-size: 2rem;
    transition: all 0.3s ease;
}

.feature-item:hover .feature-icon {
    background: var(--gradient-green);
    color: white;
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-green);
}

.feature-item h4 {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    font-size: 1.3rem;
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

/* ========== KOST CARDS ========== */
.card-kost {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    margin-bottom: var(--space-lg);
    height: 100%;
    position: relative;
}

.card-kost:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-lg);
    border-color: var(--green-primary);
}

.card-img-top {
    height: 240px;
    width: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.card-kost:hover .card-img-top {
    transform: scale(1.08);
}

.card-body {
    padding: var(--space-lg);
}

.card-title {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    font-size: 1.25rem;
    line-height: 1.3;
}

.location {
    color: var(--text-muted);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.location i {
    color: var(--green-primary);
}

.price {
    color: var(--green-primary);
    font-weight: 800;
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.card-text {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.badge-status {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: var(--gradient-green);
    color: white;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 2;
    box-shadow: var(--shadow-sm);
    border: 2px solid white;
}

.text-warning {
    color: #F59E0B !important;
}

.text-warning i {
    margin-right: 2px;
}

/* ========== FOOTER ========== */
.footer {
    background: var(--gradient-dark);
    color: var(--text-light);
    padding: var(--space-2xl) 0 var(--space-xl);
    margin-top: var(--space-2xl);
}

.footer h5 {
    color: var(--text-light);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    position: relative;
    padding-bottom: var(--space-sm);
    font-size: 1.1rem;
}

.footer h5::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--gradient-green);
    border-radius: var(--radius-full);
}

.footer p {
    color: var(--gray-400);
    line-height: 1.6;
}

.footer a {
    color: var(--gray-400);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.footer a:hover {
    color: var(--green-primary);
    transform: translateX(5px);
}

.footer ul {
    padding-left: 0;
}

.footer ul li {
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.footer ul li i {
    color: var(--green-primary);
    width: 20px;
}

.copyright {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--space-lg);
    margin-top: var(--space-xl);
    text-align: center;
    color: var(--gray-500);
    font-size: 0.9rem;
}

/* ========== SOCIAL ICONS ========== */
.fs-5 {
    font-size: 1.25rem !important;
}

.fab {
    transition: all 0.3s ease;
}

.fa-facebook-f:hover {
    color: #1877F2 !important;
    transform: translateY(-3px);
}

.fa-instagram:hover {
    color: #E4405F !important;
    transform: translateY(-3px);
}

.fa-whatsapp:hover {
    color: #25D366 !important;
    transform: translateY(-3px);
}

/* ========== RESPONSIVE DESIGN ========== */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .search-section {
        margin-top: -80px;
    }
}

@media (max-width: 992px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .search-section {
        margin-top: -60px;
        padding: var(--space-lg);
    }
    
    .kampus-logo {
        width: 100px;
        height: 100px;
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-section {
        padding: var(--space-2xl) 0 var(--space-xl);
    }
    
    .search-section {
        margin-top: -40px;
        padding: var(--space-md);
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .feature-item, .card-kost {
        margin-bottom: var(--space-md);
    }
    
    .footer {
        text-align: center;
    }
    
    .footer h5::after {
        left: 50%;
        transform: translateX(-50%);
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: var(--space-xs);
    }
    
    .navbar-nav {
        text-align: center;
    }
    
    .nav-link {
        margin: var(--space-xs) 0;
    }
}

/* ========== ANIMATIONS ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* ========== ACCESSIBILITY ========== */
:focus-visible {
    outline: 3px solid var(--green-primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}