/* ============================================
   ONLINE EARNING PLATFORM - CORPORATE STYLE
   Color Theme: White + Blue + Green
   ============================================ */

/* ============================================
   CSS VARIABLES & RESET
   ============================================ */
:root {
    --bg-primary: #F9FAFB;
    --bg-card: #FFFFFF;
    --color-blue: #2563EB;
    --color-green: #22C55E;
    --color-gray: #E5E7EB;
    --color-text: #020617;
    --color-text-light: #475569;
    --max-width: 1200px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
}

h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
    color: var(--color-text-light);
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 5rem 0;
}

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

.section-title h2 {
    margin-bottom: 1rem;
}

.section-title p {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
    background: var(--bg-card);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-blue);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-menu a {
    color: var(--color-text);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-menu a.active {
    color: var(--color-blue);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-blue);
}

.header-cta {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--color-text);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    padding: 0.75rem 1.75rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    display: inline-block;
    text-align: center;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background: #16a34a;
    transform: translateY(-2px);
}

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

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

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    background: var(--bg-card);
    padding: 6rem 0;
    min-height: 600px;
    display: flex;
    align-items: center;
}

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

.hero-text h1 {
    color: var(--color-text);
    line-height: 1.2;
}

.hero-text p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: var(--color-text-light);
}

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

.hero-image {
    position: relative;
}

.hero-image img {
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* ============================================
   COMPANY OVERVIEW
   ============================================ */
.overview {
    background: var(--bg-card);
}

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

.overview-text h2 {
    margin-bottom: 1.5rem;
}

.overview-text p {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

.overview-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.stat-card {
    text-align: center;
    padding: 1.5rem;
}

.stat-card h3 {
    font-size: 2.5rem;
    color: var(--color-blue);
    margin-bottom: 0.5rem;
}

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

.overview-image img {
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* ============================================
   HOW IT WORKS
   ============================================ */
.how-it-works {
    background: var(--bg-primary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.step-icon {
    width: 80px;
    height: 80px;
    background: var(--bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--color-blue);
}

.step-card h3 {
    margin-bottom: 1rem;
}

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

/* ============================================
   EARNING OPPORTUNITIES
   ============================================ */
.opportunities {
    background: var(--bg-card);
}

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

.opportunity-card {
    background: var(--bg-primary);
    padding: 2.5rem;
    border-radius: 12px;
    transition: var(--transition);
    border: 2px solid transparent;
}

.opportunity-card:hover {
    border-color: var(--color-blue);
    transform: translateY(-5px);
}

.opportunity-icon {
    width: 60px;
    height: 60px;
    margin: auto;
    background: var(--color-blue);
    color: white;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.opportunity-card h3 {
    margin-bottom: 1rem;
}

.opportunity-card ul {
    list-style: none;
    margin: 1.5rem 0;
}

.opportunity-card ul li {
    padding: 0.5rem 0;
    color: var(--color-text-light);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.opportunity-card ul li::before {
    content: '✓';
    color: var(--color-green);
    font-weight: bold;
}

/* ============================================
   WHY CHOOSE US
   ============================================ */
.why-choose {
    background: var(--bg-primary);
}

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

.feature-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: var(--bg-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.75rem;
    color: var(--color-green);
}

.feature-card h3 {
    margin-bottom: 1rem;
}

.feature-card p {
    margin: 0;
}

/* ============================================
   TESTIMONIALS
   ============================================ */
.testimonials {
    background: var(--bg-card);
}

.testimonials-slider {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.testimonial-card {
    background: var(--bg-primary);
    padding: 3rem;
    border-radius: 12px;
    text-align: center;
}

.testimonial-text {
    font-size: 1.25rem;
    font-style: italic;
    color: var(--color-text);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--color-gray);
}

.author-info h4 {
    margin-bottom: 0.25rem;
}

.author-info p {
    margin: 0;
    font-size: 0.875rem;
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
    background: var(--color-blue);
    color: white;
    text-align: center;
    padding: 5rem 0;
}

.cta-section h2 {
    color: white;
    margin-bottom: 1rem;
}

.cta-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

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

.btn-white:hover {
    background: var(--bg-primary);
    transform: translateY(-2px);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-text);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h3 {
    color: white;
    margin-bottom: 1.5rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-blue);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   FADE IN ANIMATION
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

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

    h2 {
        font-size: 1.75rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .section {
        padding: 3rem 0;
    }

    .header-container {
        padding: 1rem 1.5rem;
    }

    .nav-menu {
        display: none;
    }

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

    .hero {
        padding: 3rem 0;
        min-height: auto;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .hero-text p {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .overview-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .overview-stats {
        grid-template-columns: 1fr;
    }

    .steps-grid {
        grid-template-columns: 1fr;
    }

    .opportunities-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .cta-buttons .btn {
        width: 100%;
    }
}

/* ============================================
   MOBILE MENU OVERLAY
   ============================================ */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 400px;
    height: 100vh;
    background: var(--bg-card);
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
    z-index: 2000;
    transition: right 0.3s ease;
    padding: 2rem;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.mobile-menu-close {
    font-size: 1.5rem;
    color: var(--color-text);
}

.mobile-nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mobile-nav-menu a {
    color: var(--color-text);
    font-weight: 500;
    font-size: 1.125rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-gray);
}

.mobile-nav-menu a.active {
    color: var(--color-blue);
}

.mobile-menu-cta {
    margin-top: 2rem;
}

.mobile-menu-cta .btn {
    width: 100%;
    margin-bottom: 1rem;
}

.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1999;
    display: none;
}

.mobile-overlay.active {
    display: block;
}

/* ============================================
   PLANS PAGE
   ============================================ */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.plan-card {
    background: var(--bg-card);
    border: 2px solid var(--color-gray);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    transition: var(--transition);
}

.plan-card:hover {
    border-color: var(--color-blue);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.plan-card.featured {
    border-color: var(--color-blue);
    position: relative;
}

.plan-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-green);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.plan-card h3 {
    margin-bottom: 1rem;
}

.plan-price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-blue);
    margin-bottom: 0.5rem;
}

.plan-period {
    color: var(--color-text-light);
    margin-bottom: 2rem;
}

.plan-features {
    list-style: none;
    margin: 2rem 0;
    text-align: left;
}

.plan-features li {
    padding: 0.75rem 0;
    color: var(--color-text-light);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.plan-features li::before {
    content: '✓';
    color: var(--color-green);
    font-weight: bold;
    font-size: 1.25rem;
}

/* ============================================
   FAQ PAGE
   ============================================ */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    margin-bottom: 1rem;
    border-radius: 8px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--bg-primary);
}

.faq-question.active {
    color: var(--color-blue);
}

.faq-icon {
    transition: transform 0.3s ease;
}

.faq-question.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer-content {
    padding: 0 1.5rem 1.5rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ============================================
   CONTACT PAGE
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 12px;
}

.contact-info h3 {
    margin-bottom: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--bg-primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-blue);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact-item-content h4 {
    margin-bottom: 0.25rem;
}

.contact-item-content p {
    margin: 0;
}

.contact-form {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 12px;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--color-gray);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-blue);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.about-hero {
    background: var(--bg-card);
    text-align: center;
    padding: 4rem 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.mission-vision {
    background: var(--bg-card);
}

.mission-vision-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.mission-card,
.vision-card {
    padding: 2rem;
    background: var(--bg-primary);
    border-radius: 12px;
}

.mission-card h3,
.vision-card h3 {
    margin-bottom: 1rem;
    color: var(--color-blue);
}

@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .mission-vision-grid {
        grid-template-columns: 1fr;
    }
}