/* ============================================
   BUSI_TECH_SN - Design System (Vanilla Version)
   ============================================ */

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

:root {
    --primary-dark: #003366;
    --primary-blue: #0066CC;
    --primary-cyan: #00D9FF;
    --accent-orange: #FF6B35;
    --accent-purple: #7C3AED;
    --light-bg: #F0F4F8;
    --white: #FFFFFF;
    --dark-text: #1A1A2E;
    --gray-text: #666666;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    --transition-fast: 200ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 400ms ease-in-out;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    color: var(--dark-text);
    background-color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3.5rem;
    font-family: 'Playfair Display', serif;
}

h2 {
    font-size: 2.5rem;
    font-family: 'Playfair Display', serif;
}

h3 {
    font-size: 1.5rem;
}

p {
    color: var(--gray-text);
    margin-bottom: var(--spacing-md);
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.3rem;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-img {
    width: 90px;
    height: 90px;
    border-radius: var(--radius-md);
    object-fit: cover;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    font-weight: 500;
    color: var(--dark-text);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-cyan), var(--accent-orange));
    transition: width var(--transition-normal);
}

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--dark-text);
    margin: 5px 0;
    border-radius: 2px;
}

/* Hero */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 51, 102, 0.7), rgba(0, 217, 255, 0.3));
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    color: var(--white);
    max-width: 800px;
    padding: var(--spacing-lg);
}

.hero-title {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

/* Buttons */
.cta-button {
    background: linear-gradient(135deg, var(--accent-orange), #FF8C42);
    color: var(--white);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 10px 30px rgba(255, 107, 53, 0.3);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(255, 107, 53, 0.4);
}

/* Services */
.services {
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: linear-gradient(180deg, var(--white), var(--light-bg));
}

.services-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--gray-text);
    margin-bottom: var(--spacing-2xl);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.service-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all var(--transition-normal);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 217, 255, 0.2);
}

.service-image {
    width: 100%;
    height: 250px;
    background-size: cover;
    background-position: center;
}

.service-content {
    padding: var(--spacing-lg);
}

.service-link {
    display: inline-block;
    color: var(--accent-orange);
    font-weight: 600;
    margin-top: var(--spacing-sm);
}

/* Why Us */
.why-us {
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-blue));
    color: var(--white);
}

.why-us-container {
    max-width: 1200px;
    margin: 0 auto;
}

.why-us-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.why-us-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
}

.why-us-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

/* Stats */
.stats {
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.stats-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--light-bg);
    border-radius: var(--radius-lg);
}

.stat-number {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

/* Contact */
.contact {
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: var(--white);
}

.contact-container {
    max-width: 1200px;
    margin: 0 auto;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
}

.contact-item {
    margin-bottom: var(--spacing-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-form input, .contact-form textarea {
    padding: var(--spacing-md);
    border: 1px solid #ddd;
    border-radius: var(--radius-sm);
    font-family: inherit;
}

/* Footer */
.footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-lg);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section ul {
    list-style: none;
    margin-top: var(--spacing-md);
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 600px;
    width: 90%;
    position: relative;
}

.close {
    position: absolute;
    right: var(--spacing-md);
    top: var(--spacing-md);
    font-size: 2rem;
    cursor: pointer;
}


/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 2.5rem;
    }
}