/* ===========================
   CSS Variables & Base Styles
   =========================== */
:root {
    /* Brand Colors */
    --primary: #1C7A6B;
    --secondary: #124275;
    --accent: #EFA336;
    --surface: #f2f2f7;
    --card: #ffffff;
    --separator: rgba(0, 0, 0, 0.08);

    /* Text Colors */
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-light: #999999;

    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #1C7A6B 0%, #124275 100%);
    --gradient-accent: linear-gradient(135deg, #1C7A6B 0%, #EFA336 100%);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-black: 800;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background-color: var(--surface);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.logo:hover {
    color: var(--accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: var(--font-weight-medium);
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--primary);
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    overflow: hidden;
}

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

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(239, 163, 54, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(18, 66, 117, 0.1) 0%, transparent 50%);
    opacity: 0.6;
}

.hero-content {
    text-align: center;
    color: white;
    max-width: 800px;
    padding: var(--spacing-2xl) 0;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: var(--font-weight-black);
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    line-height: 1.5;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    font-weight: var(--font-weight-normal);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-family: var(--font-family);
    white-space: nowrap;
}

.btn-primary {
    background: white;
    color: var(--primary);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-accent {
    background: var(--gradient-accent);
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-icon {
    width: 20px;
    height: 20px;
}

/* ===========================
   Section Styles
   =========================== */
section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.25rem;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ===========================
   Features Section
   =========================== */
.features {
    background-color: var(--surface);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.feature-card {
    background: var(--card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: white;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

.badge {
    display: inline-block;
    background: var(--gradient-accent);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    margin-left: var(--spacing-xs);
    vertical-align: middle;
}

/* ===========================
   How It Works Section
   =========================== */
.how-it-works {
    background: white;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.step {
    text-align: center;
    padding: var(--spacing-lg);
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient-hero);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin: 0 auto var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.step-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.step-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===========================
   Screens Section
   =========================== */
.screens {
    background: var(--surface);
}

.screens-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.screen-card {
    text-align: center;
}

.screen-mockup {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-md);
    border: 8px solid #1a1a1a;
    aspect-ratio: 9 / 19.5;
    display: flex;
    flex-direction: column;
}

.screen-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.screen-header {
    background: var(--gradient-hero);
    color: white;
    padding: var(--spacing-md);
    font-weight: var(--font-weight-semibold);
    font-size: 1.125rem;
}

.screen-body {
    flex: 1;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.metric-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
}

.metric-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary);
}

.route-option {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.route-name {
    font-weight: var(--font-weight-medium);
}

.route-cost {
    font-weight: var(--font-weight-bold);
    color: var(--accent);
}

.chart-placeholder {
    height: 80px;
    background: linear-gradient(to top, var(--primary) 0%, var(--accent) 100%);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: white;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.screen-label {
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

/* ===========================
   Pricing Section
   =========================== */
.pricing {
    background: white;
}

.pricing .container {
    max-width: 1200px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.pricing-card {
    background: var(--card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--separator);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
}

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

.pricing-card.featured {
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(239, 163, 54, 0.2);
}

.best-value-badge {
    position: absolute;
    top: -12px;
    right: var(--spacing-lg);
    background: var(--gradient-accent);
    color: white;
    padding: 0.375rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--shadow-md);
}

.pricing-title {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.pricing-price {
    margin-bottom: var(--spacing-lg);
}

.price-amount {
    font-size: 3rem;
    font-weight: var(--font-weight-black);
    color: var(--primary);
}

.price-period {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-left: 0.25rem;
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
    flex: 1;
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.75rem;
}

.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: var(--font-weight-bold);
    font-size: 1.25rem;
}

.pricing-note {
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
    font-style: italic;
}

/* ===========================
   FAQ Section
   =========================== */
.faq {
    background: var(--surface);
}

.faq-list {
    max-width: 800px;
    margin: var(--spacing-xl) auto 0;
}

.faq-item {
    background: var(--card);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    text-align: left;
    font-family: var(--font-family);
    transition: background-color 0.3s ease;
}

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

.faq-icon {
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

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

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

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--gradient-hero);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

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

.footer-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

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

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a, .footer-link a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover, .footer-link a:hover {
    color: white;
}

.app-store-badge {
    display: inline-block;
    transition: transform 0.3s ease;
}

.app-store-badge:hover {
    transform: scale(1.05);
}

.app-store-badge img {
    display: block;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-note {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 900px) {
    .pricing-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

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

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

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

    .screens-showcase {
        grid-template-columns: 1fr;
    }

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

    section {
        padding: var(--spacing-2xl) 0;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero-title {
        font-size: 2rem;
    }

    .price-amount {
        font-size: 2.5rem;
    }

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

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

/* Smooth scroll offset for fixed navbar */
html {
    scroll-padding-top: 80px;
}

/* Focus styles for accessibility */
a:focus, button:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .navbar, .footer {
        display: none;
    }
}