/* STEMverse Main Stylesheet */

/* CSS Variables */
:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #06d6a0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --dark-color: #1f2937;
    --light-color: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
    
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --light-color: #1e293b;
    --dark-color: #f8fafc;
    --gray-100: #334155;
    --gray-200: #475569;
    --gray-300: #64748b;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--light-color);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--gray-600);
}

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

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

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

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

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

.btn-tertiary {
    background: transparent;
    color: var(--gray-600);
    border: none;
}

.btn-tertiary:hover {
    color: var(--primary-color);
}

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Header */
.main-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
}

.navbar {
    padding: 1rem 0;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.brand-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 2rem;
}

.nav-link {
    color: var(--gray-700);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

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

.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 100;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    list-style: none;
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-100);
}

.dropdown-menu a:hover {
    background: var(--gray-50);
    color: var(--primary-color);
}

.dropdown-menu a:last-child {
    border-bottom: none;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle,
.lang-toggle {
    background: none;
    border: none;
    color: var(--gray-600);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.theme-toggle:hover,
.lang-toggle:hover {
    background: var(--gray-100);
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    gap: 0.25rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--gray-700);
    transition: var(--transition-fast);
}

/* Hero Section */
.hero-banner {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.hero-bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(37, 99, 235, 0.8);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    color: white;
    max-width: 800px;
    margin: 0 auto;
}

.hero-headline {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-headline span {
    color: var(--accent-color);
}

.hero-subtext {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    opacity: 0.9;
}

.feature-item i {
    color: var(--accent-color);
}

.hero-ctas {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2;
    pointer-events: none;
}

.floating-icon {
    position: absolute;
    font-size: 2rem;
    color: rgba(255, 255, 255, 0.1);
    animation: float 6s ease-in-out infinite;
}

.floating-icon:nth-child(2) {
    animation-delay: -2s;
}

.floating-icon:nth-child(3) {
    animation-delay: -4s;
}

.floating-icon:nth-child(4) {
    animation-delay: -1s;
}

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

/* Section Styles */
section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

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

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about-section {
    background: var(--gray-50);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.mission-vision {
    display: grid;
    gap: 2rem;
}

.mission h3,
.vision h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.impact-metrics h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--gray-800);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.metric-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.metric-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.counter {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.metric-item span {
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* Verticals Section */
.verticals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.vertical-card {
    background: white;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--gray-200);
}

.vertical-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.card-header {
    position: relative;
    padding: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.card-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.card-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.card-content {
    padding: 2rem;
}

.card-content h3 {
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.card-content p {
    margin-bottom: 1.5rem;
}

.feature-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--gray-600);
}

.feature-list i {
    color: var(--success-color);
    font-size: 0.8rem;
}

.card-footer {
    padding: 0 2rem 2rem;
}

.learn-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition-fast);
}

.learn-more:hover {
    gap: 1rem;
}

/* LMS Access Panel */
.lms-panel {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.lms-content {
    text-align: center;
}

.lms-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.lms-login h3 {
    margin-bottom: 2rem;
}

.login-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.btn-student,
.btn-teacher,
.btn-admin {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    color: var(--gray-800);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: left;
}

.btn-student:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--gray-800);
}

.btn-teacher:hover {
    border-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--gray-800);
}

.btn-admin:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--gray-800);
}

.btn-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: var(--transition);
}

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

.btn-teacher:hover .btn-icon {
    background: var(--secondary-color);
    color: white;
}

.btn-admin:hover .btn-icon {
    background: var(--accent-color);
    color: white;
}

.btn-text {
    flex: 1;
}

.btn-title {
    display: block;
    font-weight: 600;
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.btn-subtitle {
    display: block;
    color: var(--gray-500);
    font-size: 0.875rem;
}

.lms-features h3 {
    margin-bottom: 2rem;
    text-align: left;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    text-align: left;
}

.feature-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.feature-content h4 {
    margin-bottom: 0.5rem;
    color: var(--gray-800);
}

.feature-content p {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin: 0;
}

.lms-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.stat-label {
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* Fixed Action Icons */
.fixed-actions {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 900;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.action-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    opacity: 0.9;
}

.action-icon:hover {
    transform: scale(1.1);
    opacity: 1;
    box-shadow: var(--shadow-xl);
}

#back-to-top {
    opacity: 0;
    visibility: hidden;
    transform: translateY(100px);
}

#back-to-top.visible {
    opacity: 0.9;
    visibility: visible;
    transform: translateY(0);
}

#quick-contact {
    background: var(--success-color);
}

/* Contact Panel */
.contact-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: white;
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    transition: var(--transition);
    overflow-y: auto;
}

.contact-panel.active {
    right: 0;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    background: var(--primary-color);
    color: white;
}

.panel-header h3 {
    margin: 0;
}

.close-panel {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.close-panel:hover {
    background: rgba(255, 255, 255, 0.1);
}

.panel-content {
    padding: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    color: var(--gray-800);
    transition: var(--transition-fast);
}

.contact-item:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.contact-item.whatsapp {
    background: #25d366;
    color: white;
}

.contact-item.whatsapp:hover {
    background: #128c7e;
    color: white;
}

.quick-inquiry-form {
    margin-top: 2rem;
}

.quick-inquiry-form input,
.quick-inquiry-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    font-family: inherit;
    transition: var(--transition-fast);
}

.quick-inquiry-form input:focus,
.quick-inquiry-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Footer Styles */
.main-footer {
    background: var(--gray-900);
    color: var(--gray-300);
}

.footer-newsletter {
    background: var(--gray-800);
    padding: 3rem 0;
    text-align: center;
}

.newsletter-content h3 {
    color: white;
    margin-bottom: 1rem;
}

.newsletter-content p {
    margin-bottom: 2rem;
}

.newsletter-form {
    display: flex;
    justify-content: center;
    gap: 1rem;
    max-width: 400px;
    margin: 0 auto;
}

.newsletter-form input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--gray-600);
    border-radius: var(--border-radius);
    background: var(--gray-700);
    color: white;
}

.newsletter-form input::placeholder {
    color: var(--gray-400);
}

.footer-main {
    padding: 3rem 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.footer-col h4 {
    color: white;
    margin-bottom: 1rem;
}

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

.footer-col ul li {
    margin-bottom: 0.5rem;
}

.footer-col a {
    color: var(--gray-400);
    transition: var(--transition-fast);
}

.footer-col a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gray-700);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.footer-bottom {
    background: var(--gray-800);
    padding: 1.5rem 0;
    border-top: 1px solid var(--gray-700);
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-legal {
    display: flex;
    gap: 2rem;
}

.footer-legal a {
    color: var(--gray-400);
    font-size: 0.875rem;
}

.footer-legal a:hover {
    color: white;
}