/* ===== CSS Variables ===== */
:root {
    --accent: #D6FF57;
    --accent-dark: #B8E040;
    --bg-light: #FFFFFF;
    --bg-gray: #F9FAFB;
    --bg-dark: #111111;
    --text-dark: #111111;
    --text-gray: #6B7280;
    --text-light: #FFFFFF;
    --border-light: #E5E7EB;
    --success: #10B981;
    --error: #EF4444;
    
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --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);
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
    overflow-x: hidden;
}

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

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

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.06em;
    line-height: 1.2;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-md) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo img {
    height: 38px;
}

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

.nav a {
    color: var(--text-gray);
    font-weight: 400;
    transition: color 0.2s;
}

.nav a:hover {
    color: var(--text-dark);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: all 0.3s;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 73px;
    left: 0;
    right: 0;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-lg);
    flex-direction: column;
    gap: var(--spacing-md);
    z-index: 99;
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-align: center;
}

.btn-primary {
    background: var(--accent);
    color: var(--text-dark);
}

.btn-primary:hover {
    background: var(--accent-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    border-color: var(--text-dark);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

.btn-donation {
    background: var(--bg-gray);
    color: var(--text-dark);
    border: 2px solid var(--border-light);
    min-width: 80px;
}

.btn-donation:hover {
    background: var(--accent);
    border-color: var(--accent);
}

.btn-custom {
    min-width: 100px;
}

/* ===== Hero Section ===== */
.hero {
    padding: var(--spacing-3xl) 0;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-gray) 100%);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-md);
}

.hero-title .highlight {
    color: var(--text-dark);
    position: relative;
    display: inline-block;
}

.hero-title .highlight::after {
    content: '';
    position: absolute;
    bottom: 0.1em;
    left: 0;
    right: 0;
    height: 0.3em;
    background: var(--accent);
    z-index: -1;
    opacity: 0.5;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
    justify-content: center;
    flex-wrap: wrap;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-light);
    max-width: 800px;
    margin: 0 auto;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.06em;
    color: var(--text-dark);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-gray);
    margin-top: var(--spacing-xs);
}

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

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

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-gray);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.dark-section {
    background: var(--bg-dark);
    color: var(--text-light);
}

.dark-section .section-title,
.dark-section .section-subtitle {
    color: var(--text-light);
}

.dark-section .text-gray {
    color: #9CA3AF;
}

/* ===== Example Section ===== */
.example-section {
    background: var(--bg-gray);
}

.example-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    background: var(--bg-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.example-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-image {
    width: 100%;
    aspect-ratio: 4/3;
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    color: var(--text-gray);
}

.example-results {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.example-score {
    text-align: center;
}

.score-circle {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-md);
}

.score-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.06em;
}

.score-label {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--accent-dark);
}

.example-attributes {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.attribute-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--bg-gray);
}

.attribute-item.matched {
    background: #ECFDF5;
    border: 1px solid #10B981;
}

.attribute-item.unmatched {
    background: #FEF2F2;
    border: 1px solid #EF4444;
}

.attribute-item svg {
    flex-shrink: 0;
    margin-top: 2px;
}

/* ===== Steps Grid ===== */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.step-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--text-dark);
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.step-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

.step-description {
    color: #9CA3AF;
}

/* ===== Features Grid ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    padding: var(--spacing-xl);
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--text-gray);
}

/* ===== Audience Grid ===== */
.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.audience-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.audience-emoji {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.audience-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

.audience-description {
    color: #9CA3AF;
}

/* ===== Pricing ===== */
.pricing-card {
    max-width: 500px;
    margin: 0 auto;
    padding: var(--spacing-2xl);
    background: var(--bg-gray);
    border-radius: var(--radius-xl);
    text-align: center;
    border: 2px solid var(--accent);
    position: relative;
}

.pricing-badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: var(--text-dark);
    padding: 8px 24px;
    border-radius: 100px;
    font-weight: 700;
    font-size: 0.875rem;
}

.pricing-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

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

.price-amount {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: -0.06em;
}

.price-period {
    color: var(--text-gray);
    font-size: 1.125rem;
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: var(--spacing-xl);
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
}

/* ===== Support Section ===== */
.support-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.support-description {
    font-size: 1.125rem;
    color: #9CA3AF;
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.support-stats {
    display: flex;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

.support-stat {
    flex: 1;
    min-width: 200px;
}

.support-stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.06em;
    color: var(--accent);
}

.support-stat-label {
    color: #9CA3AF;
    margin-top: var(--spacing-xs);
}

.donation-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
}

.donation-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

.donation-subtitle {
    color: #9CA3AF;
    margin-bottom: var(--spacing-md);
}

.donation-benefits {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

.donation-benefits li {
    padding: var(--spacing-xs) 0;
    color: #9CA3AF;
    position: relative;
    padding-left: var(--spacing-md);
}

.donation-benefits li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

.donation-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.donation-note {
    text-align: center;
    color: #9CA3AF;
    font-size: 0.875rem;
}

/* ===== FAQ ===== */
.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.faq-item {
    padding: var(--spacing-xl);
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
}

.faq-question {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

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

/* ===== Final CTA ===== */
.final-cta-section {
    text-align: center;
}

.cta-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

.cta-subtitle {
    font-size: 1.25rem;
    color: #9CA3AF;
    margin-bottom: var(--spacing-xl);
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
    margin-bottom: var(--spacing-md);
}

.footer-tagline {
    color: #9CA3AF;
}

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

.footer-column h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

.footer-column a {
    display: block;
    color: #9CA3AF;
    padding: var(--spacing-xs) 0;
    transition: color 0.2s;
}

.footer-column a:hover {
    color: var(--accent);
}

.footer-bottom {
    text-align: center;
    color: #9CA3AF;
    font-size: 0.875rem;
}

.footer-bottom p {
    margin: var(--spacing-xs) 0;
}

.footer-bottom a {
    color: var(--accent);
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .example-card {
        grid-template-columns: 1fr;
    }
    
    .support-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 640px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-stats {
        gap: var(--spacing-lg);
    }
    
    .steps-grid,
    .features-grid,
    .audience-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .donation-buttons {
        grid-template-columns: repeat(1, 1fr);
    }
    
    .support-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* ===== Utility Classes ===== */
.text-center {
    text-align: center;
}

.text-gray {
    color: var(--text-gray);
}

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }