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

:root {
    --black: #000000;
    --white: #FFFFFF;
    --gray-light: #E5E5E5;
    --gray-text: #666666;
    --max-width: 1200px;
    --spacing-xl: 160px;
    --spacing-lg: 120px;
    --spacing-md: 80px;
    --spacing-sm: 40px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background: var(--white);
    color: var(--black);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding-top: 80px;
}

.serif {
    font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-light);
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 20px;
    padding-bottom: 20px;
}

.nav-brand {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-links a {
    color: var(--black);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s ease;
    position: relative;
}

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

.nav-links a:not(.btn):after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--black);
    transition: width 0.2s ease;
}

.nav-links a:not(.btn):hover:after {
    width: 100%;
}

.btn-small {
    padding: 10px 24px;
    font-size: 14px;
    color: var(--white);
}

.btn-small:hover {
    color: var(--black);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 60px;
}

section {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--gray-light);
}

section:last-of-type {
    border-bottom: none;
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
    text-align: center;
}

.hero h1 {
    font-size: 72px;
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: 40px;
    line-height: 1.1;
}

.hero p {
    font-size: 20px;
    line-height: 1.7;
    max-width: 760px;
    margin: 0 auto 60px auto;
    color: var(--black);
}

.btn {
    display: inline-block;
    padding: 18px 48px;
    background: var(--black);
    color: var(--white);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    border: 2px solid var(--black);
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn:hover {
    background: var(--white);
    color: var(--black);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

/* Problem Section */
.problem {
    padding: var(--spacing-lg) 0;
}

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

.problem h2 {
    font-size: 42px;
    font-weight: 400;
    margin-bottom: 48px;
    line-height: 1.2;
}

.problem p {
    font-size: 20px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.problem .subtext {
    font-size: 18px;
    color: var(--gray-text);
    margin-top: 40px;
    font-style: italic;
    line-height: 1.7;
}

/* What We Install Section */
.install {
    padding: var(--spacing-lg) 0;
    background: #FAFAFA;
}

.install h2 {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 60px;
    position: relative;
    padding-bottom: 20px;
}

.install h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--black);
}

.install > .container > p {
    font-size: 18px;
    line-height: 1.8;
    max-width: 680px;
    margin-bottom: 60px;
}

.install-roadmap {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    margin-bottom: 60px;
    max-width: 100%;
}

.install-item {
    position: relative;
    display: flex;
    align-items: stretch;
}

.install-box {
    background: var(--white);
    border: 2px solid var(--gray-light);
    padding: 32px 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.install-box:hover {
    border-color: var(--black);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.install-number {
    width: 40px;
    height: 40px;
    background: var(--black);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    margin-bottom: 20px;
}

.install-box h3 {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.4;
    margin: 0;
}

.install-arrow {
    width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.install-arrow:before {
    content: '→';
    font-size: 28px;
    color: var(--gray-text);
    font-weight: 300;
}

.install-item:last-child .install-arrow {
    display: none;
}

.install .closing-text {
    font-size: 18px;
    line-height: 1.8;
    max-width: 680px;
    margin: 0;
}

/* What You Get Section */
.benefits {
    padding: var(--spacing-lg) 0;
}

.benefits h2 {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 80px;
    position: relative;
    padding-bottom: 20px;
}

.benefits h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--black);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 100%;
}

.benefit {
    background: #FAFAFA;
    padding: 48px;
    border: 1px solid var(--gray-light);
    transition: all 0.3s ease;
}

.benefit:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.benefit h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 20px;
}

.benefit p {
    font-size: 18px;
    line-height: 1.7;
    color: var(--gray-text);
}

/* Process Section */
.process {
    padding: var(--spacing-lg) 0;
}

.process h2 {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 60px;
    position: relative;
    padding-bottom: 20px;
}

.process h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--black);
}

.process ol {
    list-style: none;
    counter-reset: step;
    max-width: 800px;
}

.process li {
    padding-left: 56px;
    position: relative;
    counter-increment: step;
    margin-bottom: 48px;
}

.process li:before {
    content: counter(step) ".";
    position: absolute;
    left: 0;
    font-weight: 700;
    font-size: 22px;
    top: 2px;
}

.process li strong {
    display: block;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
}

.process li p {
    font-size: 18px;
    line-height: 1.8;
    color: var(--gray-text);
}

/* How We Work Section */
.how-we-work {
    padding: var(--spacing-lg) 0;
    background: #FAFAFA;
}

.how-we-work h2 {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 60px;
    position: relative;
    padding-bottom: 20px;
}

.how-we-work h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--black);
}

.how-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 100%;
}

.how-item {
    background: var(--white);
    padding: 40px 32px;
    border: 1px solid var(--gray-light);
    transition: all 0.3s ease;
}

.how-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.how-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    line-height: 1.4;
}

.how-item p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-text);
    margin: 0;
}

/* Who Section */
.who {
    padding: var(--spacing-lg) 0;
    background: #FAFAFA;
}

.who h2 {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 60px;
    position: relative;
    padding-bottom: 20px;
}

.who h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--black);
}

.who .intro {
    font-size: 20px;
    line-height: 1.8;
    max-width: 680px;
    margin-bottom: 40px;
}

.who ul {
    list-style: none;
    max-width: 680px;
}

.who li {
    font-size: 20px;
    line-height: 2;
    padding-left: 32px;
    position: relative;
    padding-top: 8px;
    padding-bottom: 8px;
}

.who li:before {
    content: "•";
    position: absolute;
    left: 0;
    font-weight: 600;
    font-size: 24px;
}

/* Offer Section */
.offer {
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.offer h2 {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 60px;
    position: relative;
    padding-bottom: 20px;
    display: inline-block;
}

.offer h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--black);
}

.offer p {
    font-size: 22px;
    line-height: 1.8;
    max-width: 680px;
    margin: 0 auto 20px auto;
}

.offer p:last-of-type {
    margin-bottom: 0;
}

/* Advantage Section */
.advantage {
    padding: var(--spacing-lg) 0;
    background: #FAFAFA;
}

.advantage h2 {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 60px;
    position: relative;
    padding-bottom: 20px;
}

.advantage h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--black);
}

.advantage p {
    font-size: 22px;
    line-height: 1.9;
    max-width: 720px;
    margin-bottom: 16px;
}

/* Final CTA Section */
.final-cta {
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.final-cta h2 {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 40px;
    position: relative;
    padding-bottom: 20px;
    display: inline-block;
}

.final-cta h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--black);
}

.final-cta h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
}

.final-cta p {
    font-size: 18px;
    line-height: 1.8;
    max-width: 600px;
    margin: 0 auto 40px auto;
    color: var(--gray-text);
}

/* Footer */
footer {
    padding: 60px 0;
    text-align: center;
}

footer p {
    font-size: 14px;
    color: var(--gray-text);
}

/* Responsive */
@media (max-width: 1024px) {
    :root {
        --spacing-xl: 120px;
        --spacing-lg: 100px;
        --spacing-md: 60px;
    }

    .container {
        padding: 0 40px;
    }

    .hero h1 {
        font-size: 56px;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .nav-links {
        gap: 24px;
    }

    .install-roadmap {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .install-arrow {
        display: none;
    }

    .install-item {
        display: block;
    }

    .how-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 80px;
        --spacing-lg: 60px;
        --spacing-md: 40px;
    }

    body {
        padding-top: 70px;
    }

    .container {
        padding: 0 24px;
    }

    nav .container {
        padding-top: 16px;
        padding-bottom: 16px;
    }

    .nav-brand {
        font-size: 20px;
    }

    .nav-links {
        gap: 16px;
    }

    .nav-links a {
        font-size: 13px;
    }

    .nav-links a:nth-child(n+3):not(.btn) {
        display: none;
    }

    .hero h1 {
        font-size: 40px;
    }

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

    .problem p {
        font-size: 20px;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .benefit {
        padding: 32px;
    }

    .problem h2 {
        font-size: 32px;
    }

    .install h2,
    .benefits h2,
    .process h2,
    .how-we-work h2,
    .who h2,
    .offer h2,
    .advantage h2,
    .final-cta h2 {
        font-size: 28px;
    }

    .how-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .how-item {
        padding: 32px 24px;
    }

    .process li strong {
        font-size: 20px;
    }

    .advantage p {
        font-size: 18px;
    }

    .install-roadmap {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .install-box {
        padding: 24px 20px;
    }

    .install-box h3 {
        font-size: 14px;
    }
}