/* ======================
   Variables CSS
   ====================== */
:root {
    --primary-blue: #1E40AF;
    --primary-blue-dark: #1E3A8A;
    --primary-blue-light: #3B82F6;
    --secondary-orange: #FB923C;
    --secondary-orange-dark: #F97316;
    --secondary-orange-light: #FDBA74;
    
    --text-dark: #1F2937;
    --text-gray: #6B7280;
    --text-light: #9CA3AF;
    
    --bg-white: #FFFFFF;
    --bg-gray: #F9FAFB;
    --bg-light: #F3F4F6;
    
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    --transition: all 0.3s ease;
    --border-radius: 12px;
    --border-radius-lg: 20px;
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

img {
    max-width: 100%;
    height: auto;
}

/* ======================
   Navigation
   ====================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    z-index: 1000;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo-img {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-orange);
    transition: width 0.3s ease;
}

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

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

.nav-cta {
    margin-left: 1rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 3px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ======================
   Buttons
   ====================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* ======================
   Hero Section
   ====================== */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 60%;
    height: 150%;
    background: radial-gradient(circle, rgba(251, 146, 60, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.highlight {
    color: var(--primary-blue);
    position: relative;
    display: inline-block;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--secondary-orange);
    line-height: 1;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-gray);
    font-weight: 500;
}

.hero-illustration {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
}

/* ======================
   Section Headers
   ====================== */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.15rem;
    color: var(--text-gray);
    max-width: 700px;
    margin: 0 auto;
}

/* ======================
   Problem/Solution Section
   ====================== */
.problem-solution {
    padding: 80px 0;
    background: var(--bg-white);
}

.ps-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 3rem;
    align-items: start;
    margin-bottom: 4rem;
}

.ps-card {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
}

.ps-card.problem {
    border-left: 4px solid #EF4444;
}

.ps-card.solution {
    border-left: 4px solid #10B981;
}

.ps-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.problem-icon {
    background: #FEE2E2;
    color: #DC2626;
}

.solution-icon {
    background: #D1FAE5;
    color: #059669;
}

.ps-card h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.ps-list {
    list-style: none;
}

.ps-list li {
    padding: 0.75rem 0;
    font-size: 1rem;
    color: var(--text-gray);
    border-bottom: 1px solid var(--border-color);
}

.ps-list li:last-child {
    border-bottom: none;
}

.ps-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
}

.value-props {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 4rem;
}

.value-card {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--bg-gray) 0%, var(--bg-white) 100%);
    border-radius: var(--border-radius-lg);
    transition: var(--transition);
}

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

.value-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.value-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.value-card p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* ======================
   Features Section
   ====================== */
.features {
    padding: 80px 0;
    background: var(--bg-gray);
}

.features-tabs {
    max-width: 1200px;
    margin: 0 auto;
}

.tabs-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-gray);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

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

.tab-btn svg {
    width: 20px;
    height: 20px;
}

.tabs-content {
    position: relative;
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h4 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* ======================
   School Levels Section
   ====================== */
.school-levels {
    padding: 80px 0;
    background: var(--bg-white);
}

.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.level-card {
    text-align: center;
    padding: 2rem;
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    transition: var(--transition);
    position: relative;
}

.level-card:hover {
    border-color: var(--primary-blue);
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.level-card.featured {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: white;
    border-color: var(--primary-blue);
}

.level-card.featured h3,
.level-card.featured p {
    color: white;
}

.level-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.level-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.level-card p {
    color: var(--text-gray);
    line-height: 1.6;
    font-size: 0.95rem;
}

.level-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--secondary-orange);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
}

.flexibility-note {
    background: var(--bg-light);
    border-left: 4px solid var(--primary-blue);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    display: flex;
    gap: 1rem;
    align-items: start;
}

.flexibility-note svg {
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.flexibility-note p {
    color: var(--text-gray);
    line-height: 1.7;
}

/* ======================
   Demo Section
   ====================== */
.demo-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: white;
}

.demo-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.demo-info h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.demo-info p {
    font-size: 1.15rem;
    line-height: 1.7;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.demo-benefits {
    list-style: none;
}

.demo-benefits li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    font-size: 1rem;
}

.demo-form-container {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
}

.demo-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-note {
    font-size: 0.85rem;
    color: var(--text-gray);
    text-align: center;
    margin-top: -0.5rem;
}

/* ======================
   Contact Section
   ====================== */
.contact {
    padding: 80px 0;
    background: var(--bg-gray);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.contact-card {
    text-align: center;
    padding: 2.5rem;
    background: var(--bg-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.contact-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.contact-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.contact-card p {
    color: var(--text-gray);
    line-height: 1.7;
}

.contact-card a {
    color: var(--primary-blue);
    font-weight: 600;
}

.contact-card a:hover {
    color: var(--secondary-orange);
}

/* ======================
   Footer
   ====================== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand {
    max-width: 350px;
}

.footer-logo {
    height: 40px;
    margin-bottom: 1rem;
    filter: brightness(0) invert(1);
}

.footer-tagline {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--secondary-orange);
}

.footer-description {
    font-size: 0.95rem;
    line-height: 1.7;
    opacity: 0.8;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--secondary-orange);
}

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

.footer-column li {
    margin-bottom: 0.75rem;
}

.footer-column a {
    opacity: 0.8;
    transition: var(--transition);
}

.footer-column a:hover {
    opacity: 1;
    color: var(--secondary-orange);
}

.taktylabs-credit {
    font-size: 0.95rem;
    line-height: 1.7;
    opacity: 0.8;
}

.taktylabs-link {
    color: var(--secondary-orange);
    font-weight: 600;
    text-decoration: underline;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.taktylabs-link:hover {
    color: var(--secondary-orange-light);
}

.taktylabs-link svg {
    width: 14px;
    height: 14px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* ======================
   Back to Top Button
   ====================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--secondary-orange);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top:hover {
    background: var(--secondary-orange-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.back-to-top.visible {
    display: flex;
}

/* ======================
   Responsive Design
   ====================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .ps-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .ps-arrow {
        display: none;
    }
    
    .value-props {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .demo-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--bg-white);
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
        align-items: flex-start;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-cta {
        margin-left: 0;
        width: 100%;
        justify-content: center;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        gap: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .tabs-nav {
        flex-direction: column;
        align-items: stretch;
    }
    
    .tab-btn {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .levels-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 1.875rem;
    }
    
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .ps-card {
        padding: 1.5rem;
    }
    
    .value-card {
        padding: 1.5rem;
    }
    
    .demo-form-container {
        padding: 1.5rem;
    }
}