/* ============================================
   HORIZON LANDING PAGE - MINIMAL & SEO-OPTIMIZED
   ============================================ */

/* ============================================
   DESIGN TOKENS
   ============================================ */
:root {
    /* Colors */
    --deep-dark: #0F0F0F;
    --dark-gray: #1A1A1A;
    --mid-gray: #252525;
    --soft-gray: #2F2F2F;
    --light-gray: #9E9E9E;
    --subtle-accent: #4CAF50;
    --soft-white: #F5F7FA;
    --success-green: #4CAF50;
    --error-red: #EF4444;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    --display-large: 36px;
    --display-medium: 28px;
    --title-large: 22px;
    --title-medium: 18px;
    --title-small: 16px;
    --body-large: 16px;
    --body-medium: 14px;
    --body-small: 12px;
    --label-large: 15px;

    /* Line heights */
    --lh-display-large: 44px;
    --lh-display-medium: 36px;
    --lh-title-large: 28px;
    --lh-title-medium: 24px;
    --lh-body-large: 24px;
    --lh-body-medium: 20px;

    /* Spacing - harmonized */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 64px;
    --space-3xl: 80px;

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

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Container */
    --container-max: 1200px;
    --container-padding: var(--space-md);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-family);
    font-size: var(--body-large);
    line-height: var(--lh-body-large);
    color: var(--soft-white);
    background-color: var(--deep-dark);
    overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
}

h1 {
    font-size: var(--display-large);
    line-height: var(--lh-display-large);
}

h2 {
    font-size: var(--display-medium);
    line-height: var(--lh-display-medium);
}

h3 {
    font-size: var(--title-large);
    line-height: var(--lh-title-large);
}

p {
    color: var(--light-gray);
}

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

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

section {
    padding: var(--space-3xl) 0;
}

/* ============================================
   HEADER
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: rgba(15, 15, 15, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: var(--space-sm) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: var(--title-large);
    font-weight: 600;
    color: var(--soft-white);
}

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    font-size: var(--body-medium);
    color: var(--light-gray);
    transition: color var(--transition-fast);
    font-weight: 500;
}

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

.language-selector {
    display: flex;
    gap: var(--space-xs);
    margin-left: var(--space-sm);
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--soft-gray);
    color: var(--light-gray);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: var(--body-small);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    border-color: var(--subtle-accent);
    color: var(--soft-white);
}

.lang-btn.active {
    background: var(--subtle-accent);
    border-color: var(--subtle-accent);
    color: var(--soft-white);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding-top: calc(var(--space-3xl) + 60px);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: flex;
    justify-content: center;
}

.hero-text {
    max-width: 700px;
    text-align: center;
}

.hero-title {
    margin-bottom: var(--space-md);
    color: var(--soft-white);
}

.hero-subtitle {
    font-size: var(--title-medium);
    line-height: var(--lh-title-medium);
    color: var(--light-gray);
    margin-bottom: var(--space-lg);
}

.hero-badges {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    padding: 6px 16px;
    background: var(--soft-gray);
    border-radius: var(--radius-lg);
    font-size: var(--body-small);
    font-weight: 500;
    color: var(--soft-white);
}

.cta-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 16px 32px;
    background: var(--success-green);
    color: var(--deep-dark);
    border-radius: var(--radius-md);
    font-size: var(--label-large);
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    box-shadow: 0 4px 16px rgba(76, 175, 80, 0.3);
}

.cta-primary:hover {
    background: #66bb6a;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(76, 175, 80, 0.4);
}

.cta-primary.large {
    padding: 20px 40px;
    font-size: var(--title-medium);
}

.cta-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 16px 32px;
    background: transparent;
    color: var(--soft-white);
    border: 2px solid var(--subtle-accent);
    border-radius: var(--radius-md);
    font-size: var(--label-large);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.cta-secondary:hover {
    background: rgba(76, 175, 80, 0.1);
    border-color: #66bb6a;
}

.playstore-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.hero-footnote {
    margin-top: var(--space-sm);
    font-size: var(--body-small);
    color: var(--light-gray);
}

/* ============================================
   SECTIONS COMMONS
   ============================================ */
.section-title {
    text-align: center;
    margin-bottom: var(--space-md);
    color: var(--soft-white);
}

.section-subtitle {
    text-align: center;
    font-size: var(--title-medium);
    line-height: var(--lh-title-medium);
    color: var(--light-gray);
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
}

/* ============================================
   PROBLEM SECTION
   ============================================ */
.problem {
    background: linear-gradient(180deg, var(--deep-dark) 0%, var(--dark-gray) 100%);
}

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

/* ============================================
   FEATURES SECTION
   ============================================ */
.features {
    background: var(--dark-gray);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.feature-card {
    background: var(--soft-gray);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(76, 175, 80, 0.3);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(76, 175, 80, 0.15);
    border-radius: var(--radius-md);
    color: var(--subtle-accent);
    margin-bottom: var(--space-md);
}

.feature-title {
    color: var(--soft-white);
    margin-bottom: var(--space-sm);
}

.feature-desc {
    font-size: var(--body-medium);
    line-height: var(--lh-body-medium);
    color: var(--light-gray);
}

/* ============================================
   HOW IT WORKS SECTION
   ============================================ */
.how-it-works {
    background: var(--deep-dark);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.step {
    text-align: center;
}

.step-number {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--subtle-accent);
    color: var(--soft-white);
    border-radius: 50%;
    font-size: var(--display-medium);
    font-weight: 600;
    margin: 0 auto var(--space-md);
}

.step-title {
    color: var(--soft-white);
    margin-bottom: var(--space-sm);
}

.step-desc {
    font-size: var(--body-medium);
    color: var(--light-gray);
    max-width: 300px;
    margin: 0 auto;
}

/* ============================================
   PRICING SECTION
   ============================================ */
.pricing {
    background: var(--dark-gray);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    max-width: 800px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--soft-gray);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    transition: all var(--transition-base);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-4px);
    border-color: rgba(76, 175, 80, 0.3);
}

.pricing-card.featured {
    border-color: var(--subtle-accent);
}

.plan-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--subtle-accent);
    color: var(--soft-white);
    padding: 4px 16px;
    border-radius: var(--radius-lg);
    font-size: var(--body-small);
    font-weight: 600;
}

.plan-name {
    font-size: var(--title-large);
    font-weight: 600;
    color: var(--soft-white);
    margin-bottom: var(--space-md);
    text-align: center;
}

.plan-price {
    margin-bottom: var(--space-lg);
    text-align: center;
}

.price-amount {
    font-size: 48px;
    font-weight: 700;
    color: var(--soft-white);
}

.price-period {
    font-size: var(--body-large);
    color: var(--light-gray);
}

.plan-features {
    list-style: none;
    margin-bottom: var(--space-lg);
}

.plan-features li {
    padding: var(--space-sm) 0;
    color: var(--light-gray);
    position: relative;
    padding-left: var(--space-lg);
}

.plan-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-green);
    font-weight: 700;
}

/* ============================================
   FAQ SECTION
   ============================================ */
.faq {
    background: var(--deep-dark);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

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

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) 0;
    background: none;
    border: none;
    color: var(--soft-white);
    font-size: var(--title-small);
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: color var(--transition-fast);
}

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

.faq-icon {
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding-bottom: var(--space-md);
}

.faq-answer p {
    color: var(--light-gray);
}

/* ============================================
   FINAL CTA SECTION
   ============================================ */
.final-cta {
    text-align: center;
    background: linear-gradient(135deg, var(--dark-gray) 0%, var(--deep-dark) 100%);
}

.cta-title {
    margin-bottom: var(--space-md);
    color: var(--soft-white);
}

.cta-subtitle {
    font-size: var(--title-medium);
    color: var(--light-gray);
    margin-bottom: var(--space-xl);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--deep-dark);
    padding: var(--space-2xl) 0 var(--space-lg);
    border-top: 1px solid var(--soft-gray);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-tagline {
    margin-top: var(--space-md);
    font-size: var(--body-medium);
    color: var(--light-gray);
}

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

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-title {
    font-size: var(--title-small);
    color: var(--soft-white);
    margin-bottom: var(--space-xs);
}

.footer-link {
    font-size: var(--body-medium);
    color: var(--light-gray);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--success-green);
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--soft-gray);
    text-align: center;
}

.footer-copyright {
    font-size: var(--body-small);
    color: var(--light-gray);
}

/* ============================================
   RESPONSIVE - TABLET
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --display-large: 32px;
        --display-medium: 24px;
    }

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

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

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

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

/* ============================================
   RESPONSIVE - MOBILE
   ============================================ */
@media (max-width: 640px) {
    :root {
        --display-large: 28px;
        --lh-display-large: 36px;
        --display-medium: 22px;
        --space-3xl: 64px;
    }

    .nav-link {
        display: none;
    }

    .language-selector {
        margin-left: 0;
    }

    .hero {
        padding-top: calc(var(--space-2xl) + 60px);
        min-height: auto;
    }

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

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

    .footer-links {
        grid-template-columns: 1fr;
    }

    .cta-primary.large {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

html {
    scroll-padding-top: 80px;
}

:focus-visible {
    outline: 2px solid var(--success-green);
    outline-offset: 4px;
}