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

:root {
    --primary-black: #000000;
    --secondary-black: #1a1a1a;
    --light-gray: #f5f5f5;
    --medium-gray: #e0e0e0;
    --dark-gray: #666666;
    --white: #ffffff;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    color: var(--primary-black);
    background-color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

/* =============================================
   UTILITY CLASSES
   ============================================= */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* =============================================
   NAVIGATION
   ============================================= */
.navbar {
    position: sticky;
    top: 0;
    background-color: var(--white);
    border-bottom: 1px solid var(--medium-gray);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-links a {
    text-decoration: none;
    color: var(--primary-black);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-black);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

/* =============================================
   HERO SECTION
   ============================================= */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
    z-index: -1;
}

/* Animated gradient background pattern */
.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(14, 219, 51, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 0, 0, 0.03) 0%, transparent 50%);
    animation: gradientShift 15s ease infinite alternate;
}

@keyframes gradientShift {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(20px, 20px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    animation: fadeInUp 1s ease 0.2s both;
}

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

.hero-title {
    font-size: clamp(48px, 8vw, 72px);
    font-weight: 700;
    letter-spacing: -2px;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(16px, 2.5vw, 24px);
    color: var(--dark-gray);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.4;
}

/* =============================================
   CTA BUTTONS
   ============================================= */
.cta-button {
    display: inline-block;
    padding: 16px 40px;
    background-color: var(--primary-black);
    color: var(--white);
    border: none;
    border-radius: 0;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: var(--secondary-black);
    transition: var(--transition);
    z-index: -1;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cta-button:hover::before {
    left: 0;
}

.cta-button-large {
    padding: 18px 50px;
    font-size: 16px;
}

/* =============================================
   INTRODUCTION SECTION
   ============================================= */
.intro {
    padding: 100px 0;
    background-color: var(--white);
}

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

.intro-content h2 {
    font-size: clamp(32px, 5vw, 48px);
    margin-bottom: 30px;
    font-weight: 700;
    letter-spacing: -1px;
}

.intro-content p {
    font-size: 18px;
    color: var(--dark-gray);
    line-height: 1.8;
    letter-spacing: 0.3px;
}

/* =============================================
   FEATURES SECTION
   ============================================= */
.features {
    padding: 120px 0;
    background-color: var(--light-gray);
}

.section-title {
    font-size: clamp(32px, 5vw, 48px);
    text-align: center;
    margin-bottom: 80px;
    font-weight: 700;
    letter-spacing: -1px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.feature-card {
    background-color: var(--white);
    padding: 50px 30px;
    text-align: center;
    transition: var(--transition);
    border-radius: 2px;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 25px;
    color: var(--primary-black);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
    stroke: var(--primary-black);
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    font-weight: 600;
}

.feature-card p {
    font-size: 15px;
    color: var(--dark-gray);
    line-height: 1.7;
}

/* =============================================
   STEPS SECTION
   ============================================= */
.steps {
    padding: 120px 0;
    background-color: var(--white);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 50px;
}

.step-card {
    text-align: center;
    position: relative;
    padding: 40px 30px;
    transition: var(--transition);
}

.step-card::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 50px;
    background-color: var(--medium-gray);
}

.step-card:last-child::after {
    display: none;
}

.step-number {
    font-size: 56px;
    font-weight: 700;
    color: var(--medium-gray);
    margin-bottom: 20px;
    transition: var(--transition);
}

.step-card:hover .step-number {
    color: var(--primary-black);
    transform: scale(1.1);
}

.step-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    font-weight: 600;
}

.step-card p {
    font-size: 15px;
    color: var(--dark-gray);
    line-height: 1.7;
}

/* =============================================
   CTA SECTION
   ============================================= */
.cta-section {
    padding: 120px 0;
    background-color: var(--secondary-black);
    color: var(--white);
    text-align: center;
}

.cta-section h2 {
    font-size: clamp(32px, 5vw, 48px);
    margin-bottom: 20px;
    font-weight: 700;
    letter-spacing: -1px;
}

.cta-section p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-section .cta-button {
    background-color: var(--white);
    color: var(--primary-black);
}

.cta-section .cta-button::before {
    background-color: var(--light-gray);
}

.cta-section .cta-button:hover {
    background-color: var(--white);
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
    background-color: var(--primary-black);
    color: var(--white);
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 60px;
    margin-bottom: 60px;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
    color: rgba(255, 255, 255, 0.4);
    font-size: 13px;
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */
@media (max-width: 768px) {
    .nav-links {
        gap: 20px;
        font-size: 12px;
    }

    .hero-title {
        font-size: 42px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .feature-card {
        padding: 40px 25px;
    }

    .steps-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .step-card::after {
        display: none;
    }

    .intro {
        padding: 60px 0;
    }

    .features {
        padding: 60px 0;
    }

    .steps {
        padding: 60px 0;
    }

    .cta-section {
        padding: 60px 0;
    }

    .footer {
        padding: 60px 0 20px;
    }

    .footer-content {
        gap: 40px;
    }
}

@media (max-width: 480px) {
    .hero {
        min-height: 500px;
        height: auto;
        padding: 60px 0;
    }

    .hero-title {
        font-size: 32px;
        margin-bottom: 15px;
    }

    .hero-subtitle {
        font-size: 16px;
        margin-bottom: 30px;
    }

    .cta-button {
        padding: 14px 30px;
        font-size: 12px;
    }

    .nav-links {
        gap: 15px;
    }

    .intro-content h2 {
        font-size: 28px;
    }

    .feature-card {
        padding: 30px 20px;
    }

    .step-number {
        font-size: 42px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

/* =============================================
   ACCESSIBILITY
   ============================================= */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states for keyboard navigation */
button:focus,
a:focus {
    outline: 2px solid var(--primary-black);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: more) {
    .feature-card,
    .step-card {
        border: 1px solid var(--primary-black);
    }
}