:root {
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --color-black: #000000;
    --color-white: #ffffff;
    --color-text-primary: #111111;
    --color-text-secondary: #555555;
    --spacing-container: 5vw;
    --spacing-section: 120px;
}

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

body {
    font-family: var(--font-main);
    color: var(--color-text-primary);
    background-color: var(--color-white);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-container);
    width: 100%;
}

/* Header */
.site-header {
    padding: 30px 0;
    position: relative;
    background: var(--color-white);
    z-index: 100;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.logo {
    display: block;
}

.logo-img {
    max-width: 120px;
    height: auto;
    display: block;
}

.site-nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

.site-nav a {
    text-decoration: none;
    color: var(--color-text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: opacity 0.2s ease;
}

.site-nav a:hover {
    opacity: 0.6;
}

/* Hamburger Menu */
.hamburger-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 110;
}

.bar {
    display: block;
    width: 25px;
    height: 2px;
    margin: 6px 0;
    background-color: var(--color-text-primary);
    transition: all 0.3s ease-in-out;
}

/* Hamburger Animation */
.hamburger-menu.active .bar:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger-menu.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Hero Section */
.hero-section {
    padding: 80px 0 100px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: start;
}

.hero-headline h1 {
    font-size: 5rem;
    font-weight: 500;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.hero-content {
    padding-top: 10px;
    max-width: 480px;
    margin-left: auto;
}

.hero-description {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 24px;
    color: var(--color-text-primary);
}

.btn-newsletter {
    display: inline-block;
    width: 100%;
    padding: 18px 30px;
    background: transparent;
    border: 1px solid #ccc;
    border-radius: 50px;
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-newsletter:hover {
    border-color: var(--color-black);
    background: #f9f9f9;
}

/* Content Sections */
.content-section {
    padding: 0 0 var(--spacing-section);
}

.grid-layout {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
}

.section-label h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-black);
}

.section-content {
    max-width: 800px;
}

.lead-text {
    font-size: 2.2rem;
    font-weight: 400;
    line-height: 1.4;
    margin-bottom: 30px;
    letter-spacing: -0.01em;
}

.body-text {
    font-size: 1rem;
    line-height: 1.7;
    color: #666;
    max-width: 95%;
}

strong {
    font-weight: 700;
}

/* Thinking Section */
.thinking-section {
    padding: 0 0 var(--spacing-section);
}

.section-title-center {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 60px;
    color: var(--color-black);
}

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

.card {
    background-color: #f4f4f4;
    padding: 50px;
    border-radius: 12px;
}

.card h3 {
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 25px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.card p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-primary);
}

/* Newsletter Section */
.newsletter-section {
    padding: 0 0 var(--spacing-section);
}

.newsletter-box {
    background-color: #111111;
    color: #ffffff;
    padding: 80px 60px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 80px;
}

.newsletter-content {
    flex: 1;
}

.newsletter-content h2 {
    font-size: 3rem;
    font-weight: 500;
    margin-bottom: 20px;
    line-height: 1.1;
}

.newsletter-content p {
    font-size: 1.2rem;
    line-height: 1.5;
    margin-bottom: 5px;
    color: #dddddd;
}

.newsletter-form-container {
    flex: 1;
    max-width: 450px;
    padding-top: 10px;
}

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.newsletter-form label {
    font-size: 0.95rem;
    font-weight: 500;
    color: #ffffff;
}

.newsletter-form input[type="email"] {
    width: 100%;
    padding: 18px;
    border: none;
    background-color: #ffffff;
    font-size: 1rem;
    color: #000;
    outline: none;
    border-radius: 0;
}

.newsletter-form button {
    width: 100%;
    padding: 18px;
    background-color: #ffffff;
    color: #000000;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s ease;
    margin-top: 10px;
}

.newsletter-form button:hover {
    opacity: 0.9;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-headline h1 {
        font-size: 4rem;
    }

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

    .section-label {
        margin-bottom: 15px;
    }

    .section-content {
        max-width: 100%;
    }

    .cards-grid {
        gap: 20px;
    }

    .newsletter-box {
        padding: 60px 40px;
        gap: 40px;
    }

    .newsletter-content h2 {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .site-header .container {
        align-items: center;
    }

    .hamburger-menu {
        display: block;
    }

    .site-nav {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: var(--color-white);
        z-index: 105;
        padding: 0;
        margin: 0;
        border: none;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .site-nav.active {
        display: flex;
        animation: fadeIn 0.3s ease-out forwards;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
        }

        to {
            opacity: 1;
        }
    }

    .site-nav ul {
        flex-direction: column;
        align-items: center;
        gap: 40px;
        width: 100%;
    }

    .site-nav a {
        font-size: 2rem;
        font-weight: 600;
    }

    .hero-section {
        padding: 80px 0 100px;
    }

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

    .hero-content {
        margin-left: 0;
        max-width: 100%;
    }

    .hero-headline h1 {
        font-size: 3.5rem;
    }

    .lead-text {
        font-size: 1.5rem;
    }

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

    .section-title-center {
        font-size: 2rem;
        margin-bottom: 40px;
    }

    .card {
        padding: 30px;
    }

    .newsletter-box {
        flex-direction: column;
        padding: 40px 30px;
        gap: 40px;
    }

    .newsletter-form-container {
        max-width: 100%;
        width: 100%;
    }

    .newsletter-content h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-container: 20px;
    }

    .hero-headline h1 {
        font-size: 2.75rem;
        word-wrap: break-word;
    }

    .lead-text {
        font-size: 1.25rem;
    }

    .body-text {
        font-size: 0.95rem;
    }

    .logo-text {
        font-size: 2rem;
    }

    .btn-newsletter {
        padding: 15px 20px;
    }
}