/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Professional color palette */
    --primary: #2c3e50;      /* Navy blue - professional */
    --primary-dark: #1a252f; /* Darker navy */
    --secondary: #3498db;    /* Bright blue - friendly */
    --accent: #e74c3c;       /* Coral red - accent */
    --light: #f8f9fa;
    --dark: #2c3e50;
    --success: #27ae60;      /* Green */
    --warning: #f39c12;      /* Orange */
    --danger: #e74c3c;       /* Red */
    --math: #2980b9;         /* Blue */
    --science: #8e44ad;      /* Purple */
    --prep: #d35400;         /* Deep orange */
    --gray: #7f8c8d;
    --gray-light: #ecf0f1;
    --border: #dfe6e9;
}

body {
    font-family: 'Source Sans Pro', sans-serif;
    line-height: 1.7;
    color: var(--dark);
    background-color: white;
    font-weight: 400;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 80px 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    line-height: 1.3;
}

.section-title {
    text-align: center;
    font-size: 2.4rem;
    margin-bottom: 1rem;
    color: var(--dark);
    font-weight: 700;
}

.section-subtitle {
    text-align: center;
    font-size: 1.15rem;
    color: var(--gray);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

.highlight {
    color: var(--accent);
    font-weight: 700;
}

/* Logo Styling */
.logo-image {
    height: 56px;
    width: auto;
    display: block;
}

.footer-logo-image {
    height: 48px;
    width: auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 16px;
    text-decoration: none;
    transition: opacity 0.3s;
}

.logo:hover {
    opacity: 0.9;
}

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

.logo-main {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 1.3rem;
    line-height: 1;
    color: var(--dark);
    letter-spacing: -0.5px;
}

.logo-sub {
    font-family: 'Source Sans Pro', sans-serif;
    font-size: 0.85rem;
    color: var(--gray);
    letter-spacing: 0.5px;
    font-weight: 400;
    margin-top: 2px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 1.5rem;
}

/* Navigation */
.navbar {
    background-color: white;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px;
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s;
    position: relative;
    font-family: 'Inter', sans-serif;
}

.nav-menu a:hover {
    color: var(--secondary);
}

.nav-menu a.active {
    color: var(--primary);
    font-weight: 600;
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
}

.nav-btn {
    background-color: var(--primary);
    color: white !important;
    padding: 10px 26px;
    border-radius: 6px;
    transition: all 0.3s;
    font-weight: 600;
    border: 2px solid var(--primary);
}

.nav-btn:hover {
    background-color: white;
    color: var(--primary) !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.15);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dark);
    cursor: pointer;
    padding: 8px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 160px 0 100px;
    margin-top: 82px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 120px;
    background: linear-gradient(to bottom right, transparent 49%, white 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.2rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    font-weight: 700;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 3.5rem;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3.5rem;
    margin: 3.5rem 0;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 140px;
}

.stat-number {
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 8px;
    font-family: 'Inter', sans-serif;
}

.stat-label {
    font-size: 0.95rem;
    opacity: 0.9;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.hero-buttons {
    display: flex;
    gap: 1.2rem;
    justify-content: center;
    margin-top: 2.5rem;
}

/* Buttons */
.btn-primary {
    background-color: var(--accent);
    color: white;
    padding: 16px 38px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    display: inline-block;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.25);
}

.btn-primary:hover {
    background-color: #c0392b;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(231, 76, 60, 0.35);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    padding: 16px 38px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    display: inline-block;
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s;
    font-family: 'Inter', sans-serif;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: white;
    transform: translateY(-3px);
}

/* Method Section */
.method {
    background-color: white;
    border-bottom: 1px solid var(--border);
}

.method-steps {
    max-width: 900px;
    margin: 0 auto 3rem;
}

.step {
    display: flex;
    gap: 2.5rem;
    margin-bottom: 3.5rem;
    align-items: flex-start;
    padding: 2rem;
    border-radius: 12px;
    transition: background-color 0.3s;
}

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

.step-number {
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--primary);
    opacity: 0.15;
    min-width: 70px;
    font-family: 'Inter', sans-serif;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--dark);
    font-weight: 600;
}

.step-content p {
    color: var(--gray);
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
    line-height: 1.6;
}

.step-content ul {
    list-style: none;
    padding-left: 0;
}

.step-content li {
    padding: 0.6rem 0;
    color: var(--dark);
    position: relative;
    padding-left: 28px;
    line-height: 1.5;
}

.step-content li::before {
    content: "✓";
    color: var(--success);
    position: absolute;
    left: 0;
    font-weight: bold;
    font-size: 1.1rem;
}

.method-note {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--secondary);
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    max-width: 900px;
    margin: 0 auto;
}

.method-note i {
    color: var(--secondary);
    font-size: 1.8rem;
    margin-top: 4px;
}

.method-note p {
    color: var(--dark);
    font-size: 1.05rem;
    line-height: 1.6;
    margin: 0;
}

.method-note strong {
    color: var(--primary);
}

/* Subjects Section */
.subjects {
    background-color: white;
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.subject-card {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.08);
    transition: all 0.3s;
    border: 1px solid var(--border);
    height: 100%;
}

.subject-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.12);
}

.math-card {
    border-top: 4px solid var(--math);
}

.science-card {
    border-top: 4px solid var(--science);
}

.prep-card {
    border-top: 4px solid var(--prep);
}

.subject-icon {
    font-size: 2.8rem;
    margin-bottom: 1.8rem;
    color: var(--primary);
}

.subject-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--dark);
    font-weight: 600;
}

.subject-levels {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1.8rem;
}

.level-tag {
    background: var(--gray-light);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--dark);
    font-weight: 500;
    font-family: 'Inter', sans-serif;
}

.subject-card p {
    color: var(--gray);
    line-height: 1.7;
    font-size: 1.05rem;
}

/* Sessions Section */
.sessions {
    background-color: #f8fafc;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.session-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-bottom: 3rem;
}

.session-day {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.05);
    border: 1px solid var(--border);
}

.session-day h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 2rem;
    color: var(--dark);
    font-size: 1.4rem;
}

.session-day h3 i {
    color: var(--primary);
}

.session-time {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem;
    margin-bottom: 1.2rem;
    border-radius: 8px;
    transition: all 0.3s;
    border: 1px solid var(--border);
}

.session-time.sold-out {
    background: #f8f9fa;
    border-color: #dee2e6;
}

.session-time .time {
    font-weight: 600;
    color: var(--dark);
    font-family: 'Inter', sans-serif;
}

.session-time .status {
    font-size: 0.9rem;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 20px;
    font-family: 'Inter', sans-serif;
}

.session-time.sold-out .status {
    background: var(--danger);
    color: white;
}

.pricing-box {
    text-align: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 3rem;
    border-radius: 12px;
    max-width: 500px;
    margin: 0 auto;
    box-shadow: 0 8px 25px rgba(44, 62, 80, 0.15);
}

.price-tag {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 1.5rem;
}

.price-tag .amount {
    font-size: 3.8rem;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
}

.price-tag .period {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 500;
}

.price-note {
    font-size: 1rem;
    opacity: 0.85;
    line-height: 1.6;
    max-width: 400px;
    margin: 0 auto;
}

/* Waitlist Section */
.waitlist {
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    color: white;
    padding: 100px 0;
}

.waitlist-card {
    max-width: 650px;
    margin: 0 auto;
    text-align: center;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 3.5rem;
    border-radius: 16px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.waitlist-icon {
    font-size: 4.5rem;
    margin-bottom: 2rem;
    color: var(--secondary);
}

.waitlist-card h2 {
    font-size: 2.4rem;
    margin-bottom: 1.2rem;
    color: var(--primary);
    font-weight: 700;
}

.waitlist-card p {
    font-size: 1.15rem;
    color: var(--gray);
    margin-bottom: 2.5rem;
    line-height: 1.6;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* Waitlist Form */
.waitlist-form {
    margin-top: 2.5rem;
}

.waitlist-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
    margin-bottom: 1.2rem;
}

.waitlist-form .form-group {
    margin-bottom: 1.5rem;
}

.waitlist-form input,
.waitlist-form select {
    width: 100%;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Source Sans Pro', sans-serif;
    background: white;
    color: var(--dark);
    transition: all 0.3s;
}

.waitlist-form input:focus,
.waitlist-form select:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.waitlist-form optgroup {
    font-weight: 600;
    color: var(--dark);
    font-family: 'Inter', sans-serif;
}

.waitlist-form optgroup option {
    font-weight: normal;
    padding-left: 20px;
    font-family: 'Source Sans Pro', sans-serif;
}

.btn-waitlist {
    background: linear-gradient(135deg, var(--accent) 0%, #c0392b 100%);
    color: white;
    width: 100%;
    padding: 18px;
    border: none;
    border-radius: 8px;
    font-size: 1.15rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 1.5rem;
    font-family: 'Inter', sans-serif;
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
}

.btn-waitlist:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(231, 76, 60, 0.4);
}

.waitlist-note {
    font-size: 0.95rem;
    color: var(--gray);
    margin-top: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    line-height: 1.5;
}

.waitlist-note i {
    color: var(--success);
}

/* Footer */
footer {
    background-color: var(--primary-dark);
    color: white;
    padding: 70px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3.5rem;
    margin-bottom: 3rem;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.footer-tagline {
    font-style: italic;
    color: var(--secondary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 500;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    font-size: 1.05rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.link-group h4 {
    color: white;
    margin-bottom: 1.8rem;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
}

.link-group a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin: 1rem 0;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
}

.link-group a:hover {
    color: white;
}

.link-group a i {
    width: 20px;
    color: var(--secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: 2.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom p {
    margin: 0.5rem 0;
    font-size: 0.95rem;
}

/* Responsive Design */
@media (max-width: 1100px) {
    .hero h1 {
        font-size: 2.8rem;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .hero-stats {
        gap: 2.5rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        border-top: 1px solid var(--border);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero {
        padding: 140px 0 80px;
    }
    
    .hero h1 {
        font-size: 2.4rem;
    }
    
    .hero-subtitle {
        font-size: 1.15rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        text-align: center;
    }
    
    .step {
        flex-direction: column;
        gap: 1.2rem;
        padding: 1.5rem;
    }
    
    .step-number {
        font-size: 2.2rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .waitlist-form .form-row {
        grid-template-columns: 1fr;
    }
    
    .method-note {
        flex-direction: column;
        gap: 1rem;
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.9rem;
    }
    
    .subjects-grid {
        grid-template-columns: 1fr;
    }
    
    .session-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-stats {
        gap: 2rem;
    }
    
    .stat {
        min-width: 120px;
    }
    
    .stat-number {
        font-size: 2.2rem;
    }
    
    .waitlist-card {
        padding: 2rem;
    }
    
    .waitlist-card h2 {
        font-size: 2rem;
    }
}