/* ===========================
   GoFuel Landing Page Styles
   =========================== */

:root {
    /* Colors */
    --primary: #114B36;
    --primary-light: #1A6F4F;
    --primary-dark: #0A3525;
    --secondary: #F7F9F8;
    --accent: #FF6B35;
    --text-dark: #1A1A1A;
    --text-gray: #6B7280;
    --text-light: #9CA3AF;
    --white: #FFFFFF;
    --border: #E5E7EB;
    --success: #10B981;
    --warning: #F59E0B;
    
    /* Spacing */
    --container-width: 1200px;
    --section-padding: 80px;
    --section-padding-mobile: 48px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Shadows */
    --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);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* ===========================
   Reset & Base Styles
   =========================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul {
    list-style: none;
}

/* ===========================
   Container
   =========================== */

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===========================
   Navigation
   =========================== */

#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition);
}

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

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-gray);
    transition: var(--transition);
}

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

.nav-links .btn-primary {
    padding: 10px 24px;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-full);
    font-weight: 600;
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 24px;
    flex-direction: column;
    gap: 16px;
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

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

.mobile-menu a {
    padding: 12px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-dark);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.mobile-menu a:hover {
    background: var(--secondary);
    color: var(--primary);
}

/* ===========================
   Hero Section
   =========================== */

.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #F7F9F8 0%, #E8F5E9 100%);
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    color: var(--text-dark);
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 20px;
    line-height: 1.6;
    color: var(--text-gray);
    margin-bottom: 32px;
    max-width: 540px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    background: var(--text-dark);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.download-btn svg {
    flex-shrink: 0;
}

.download-btn div {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.3;
}

.download-btn span {
    font-size: 11px;
    opacity: 0.8;
}

.download-btn strong {
    font-size: 16px;
    font-weight: 600;
}

.trust-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
}

.badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-gray);
}

.badge svg {
    flex-shrink: 0;
}

.hero-image {
    position: relative;
    animation: fadeInRight 0.8s ease-out;
}

.phone-mockup {
    position: relative;
    max-width: 400px;
    margin: 0 auto;
    animation: float 3s ease-in-out infinite;
}

.phone-mockup img {
    width: 100%;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
}

/* ===========================
   Features Section
   =========================== */

.features {
    padding: var(--section-padding) 0;
    background: var(--white);
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 60px;
}

.section-header h2 {
    font-size: 42px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-gray);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 40px 32px;
    background: var(--secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-gray);
}

/* ===========================
   How It Works Section
   =========================== */

.how-it-works {
    padding: var(--section-padding) 0;
    background: var(--secondary);
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.step {
    text-align: center;
    padding: 32px 24px;
    background: var(--white);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.step p {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ===========================
   Feature Details Section
   =========================== */

.feature-details {
    padding: var(--section-padding) 0;
    background: var(--white);
}

.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 80px;
}

.feature-detail:last-child {
    margin-bottom: 0;
}

.feature-detail.reverse {
    direction: rtl;
}

.feature-detail.reverse > * {
    direction: ltr;
}

.detail-content h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.detail-content ul {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.detail-content li {
    font-size: 17px;
    color: var(--text-gray);
    line-height: 1.6;
    padding-left: 8px;
}

.detail-image {
    position: relative;
}

.placeholder-image {
    width: 100%;
    aspect-ratio: 16/10;
    background: linear-gradient(135deg, var(--secondary) 0%, #E8F5E9 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    border: 2px dashed var(--border);
}

/* ===========================
   Screens Showcase Section
   =========================== */

.screens {
    padding: var(--section-padding) 0;
    background: var(--secondary);
}

.screens-carousel {
    position: relative;
    overflow: hidden;
    padding: 40px 0;
}

.screens-track {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    scroll-behavior: smooth;
    padding: 0 40px;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.screens-track::-webkit-scrollbar {
    display: none;
}

.screen-item {
    flex: 0 0 280px;
    text-align: center;
}

.screen-item img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.screen-item:hover img {
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
}

.screen-item p {
    margin-top: 16px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.carousel-btn:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn.prev {
    left: 0;
}

.carousel-btn.next {
    right: 0;
}

/* ===========================
   Social Proof Section
   =========================== */

.social-proof {
    padding: var(--section-padding) 0;
    background: var(--primary);
    color: var(--white);
}

.proof-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.proof-content h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.proof-content p {
    font-size: 18px;
    line-height: 1.7;
    opacity: 0.9;
}

/* ===========================
   FAQ Section
   =========================== */

.faq {
    padding: var(--section-padding) 0;
    background: var(--white);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 0;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
}

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

.faq-icon {
    font-size: 28px;
    font-weight: 300;
    color: var(--primary);
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

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

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding-bottom: 24px;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-gray);
}

.faq-answer a {
    color: var(--primary);
    text-decoration: underline;
}

/* ===========================
   Final CTA Section
   =========================== */

.final-cta {
    padding: var(--section-padding) 0;
    background: linear-gradient(135deg, var(--secondary) 0%, #E8F5E9 100%);
    text-align: center;
}

.final-cta h2 {
    font-size: 42px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.final-cta > p {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: 40px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
}

.disclaimer {
    font-size: 14px;
    color: var(--text-light);
    font-style: italic;
}

/* ===========================
   Footer
   =========================== */

footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 60px 0 24px;
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-section h3 {
    margin-bottom: 16px;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--white);
}

.footer-section p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.footer-section a {
    display: block;
    font-size: 15px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 12px;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--white);
    transform: translateX(4px);
}

.social-icons {
    display: flex;
    gap: 16px;
    margin-top: 20px;
}

.social-icons a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-icons a:hover {
    background: var(--primary);
    transform: translateY(-4px);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

/* ===========================
   Animations
   =========================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 1024px) {
    .hero-title {
        font-size: 48px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-detail {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: var(--section-padding-mobile);
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .download-btn {
        justify-content: center;
    }
    
    .section-header h2 {
        font-size: 32px;
    }
    
    .steps-container {
        grid-template-columns: 1fr;
    }
    
    .detail-content h2 {
        font-size: 28px;
    }
    
    .carousel-btn {
        display: none;
    }
    
    .final-cta h2 {
        font-size: 32px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .section-header p {
        font-size: 16px;
    }
    
    .feature-card {
        padding: 32px 24px;
    }
    
    .step {
        padding: 24px 16px;
    }
}