/* ===== ROOT & VARIABLES ===== */
:root {
    --primary-color: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #5b9ef5;
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --bg-light: #f5f5f5;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --success-color: #34a853;
    --warning-color: #fbbc04;
    --error-color: #ea4335;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

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

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

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

/* ===== CONTAINER ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== GRID ===== */
.grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-size: 1rem;
}

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

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

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

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

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

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

.btn-lg {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1.125rem;
}

/* ===== HEADER ===== */
.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.header.sticky {
    position: sticky;
    top: 0;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    text-decoration: none;
    color: var(--text-dark);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-size: 1rem;
    font-weight: 700;
}

.logo-sub {
    font-size: 0.75rem;
    color: var(--text-light);
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.phone-cta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
}

.phone-cta a {
    color: white;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-dark);
}

.mobile-nav {
    display: none;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--border-color);
}

.mobile-nav.active {
    display: flex;
}

.phone-link {
    background-color: var(--primary-color);
    color: white !important;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
}

@media (max-width: 768px) {
    .desktop-nav {
        display: none;
    }

    .phone-cta {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .header-content {
        padding: var(--spacing-sm) 0;
    }
}

/* ===== HERO SECTION ===== */
.hero {
    position: relative;
    height: 500px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    background-image: url('https://images.unsplash.com/photo-1449824913935-59a10b8d2000?w=1200&h=500&fit=crop');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(26, 115, 232, 0.7);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: var(--spacing-lg);
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.hero-content p {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
}

@media (max-width: 768px) {
    .hero {
        height: 350px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1.125rem;
    }
}

/* ===== SECTIONS ===== */
.section {
    padding: var(--spacing-2xl) 0;
}

.section h2 {
    color: var(--text-dark);
}

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

/* ===== CARDS ===== */
.card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.card-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.card h3 {
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.card p {
    color: var(--text-light);
    margin-bottom: 0;
}

/* ===== TESTIMONIALS ===== */
.testimonial-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.stars {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.stars i {
    color: #ffc107;
    font-size: 1rem;
}

.testimonial-text {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: rgba(255, 255, 255, 0.95);
}

.testimonial-author {
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0;
}

/* ===== COURSE CARDS ===== */
.course-card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.course-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.course-card h3 {
    color: var(--text-dark);
}

.course-card p {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

/* ===== CALL US SECTION ===== */
.call-us {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
}

.call-us-content {
    text-align: center;
}

.call-us-content h2 {
    color: white;
    margin-bottom: var(--spacing-lg);
}

.phone-display {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.phone-display a {
    color: white;
}

.call-us-content p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
}

/* ===== BLOG CARDS ===== */
.blog-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.blog-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.8);
}

.blog-card h3 {
    padding: var(--spacing-md) var(--spacing-md) 0;
    font-size: 1.25rem;
}

.blog-card p {
    padding: 0 var(--spacing-md);
    color: var(--text-light);
}

.blog-card .btn {
    margin: var(--spacing-md);
    width: calc(100% - var(--spacing-2xl));
}

/* ===== FOOTER ===== */
.footer {
    background-color: #1a1a1a;
    color: #ffffff;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-col h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-col p {
    color: #cccccc;
    margin-bottom: var(--spacing-sm);
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-col a {
    color: #cccccc;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid #333333;
    padding-top: var(--spacing-lg);
    text-align: center;
    color: #999999;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .section {
        padding: var(--spacing-xl) 0;
    }

    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

.text-white {
    color: white;
}

.mb-0 {
    margin-bottom: 0;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}