/* ============================================
   REIFENSCHUHE – PREMIUM LANDINGPAGE
   SEO-OPTIMIERTE VERSION
   ============================================ */

/* ------------------------------------------
   CSS Custom Properties
   ------------------------------------------ */
:root {
    /* Colors */
    --color-black: #000000;
    --color-white: #ffffff;
    --color-accent: #c01953;
    --color-light: #f5f5f5;
    --color-dark: #161616;
    --color-gray: #888888;
    --color-gray-light: #eaeaea;

    /* Layout */
    --max-width: 1400px;
    --max-width-narrow: 800px;
    --container-padding: clamp(1.5rem, 5vw, 4rem);

    /* Spacing (8px base) */
    --space-1: 0.5rem;
    --space-2: 1rem;
    --space-3: 1.5rem;
    --space-4: 2rem;
    --space-5: 3rem;
    --space-6: 4rem;
    --space-7: 6rem;
    --space-8: 8rem;

    /* Typography */
    --font-family: "Manrope", Arial, Helvetica, sans-serif;
    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    /* Border Radius */
    --radius-sm: 2px;
    --radius-md: 4px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-regular);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-black);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ------------------------------------------
   Skip Link (Accessibility)
   ------------------------------------------ */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    z-index: 9999;
    padding: var(--space-2) var(--space-4);
    background: var(--color-black);
    color: var(--color-white);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-md);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-4);
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* ------------------------------------------
   Breadcrumb Navigation (SEO)
   ------------------------------------------ */
.breadcrumb-nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    z-index: 999;
    background-color: var(--color-light);
    border-bottom: 1px solid var(--color-gray-light);
    padding: var(--space-1) 0;
    font-size: 0.8125rem;
    color: var(--color-gray);
}

.breadcrumb-nav ol {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    list-style: none;
}

.breadcrumb-nav li {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.breadcrumb-nav li:not(:last-child)::after {
    content: '›';
    color: var(--color-gray);
    margin-left: var(--space-1);
}

.breadcrumb-nav a {
    color: var(--color-gray);
    transition: color var(--transition-fast);
}

.breadcrumb-nav a:hover,
.breadcrumb-nav a:focus-visible {
    color: var(--color-accent);
}

.breadcrumb-nav li:last-child {
    color: var(--color-black);
    font-weight: var(--font-medium);
}

/* ------------------------------------------
   Container
   ------------------------------------------ */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

.container-narrow {
    max-width: var(--max-width-narrow);
}

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

/* ------------------------------------------
   Typography
   ------------------------------------------ */
.eyebrow {
    font-size: clamp(0.75rem, 1vw, 0.875rem);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--space-3);
}

.section-eyebrow {
    font-size: clamp(0.75rem, 1vw, 0.875rem);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--space-3);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: var(--font-extrabold);
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

.section-lead {
    font-size: clamp(1.1rem, 1.5vw, 1.25rem);
    font-weight: var(--font-medium);
    line-height: 1.5;
    color: var(--color-gray);
    margin-bottom: var(--space-4);
}

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

.page-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: var(--font-extrabold);
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-6);
}

/* ------------------------------------------
   Buttons
   ------------------------------------------ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-4);
    font-family: var(--font-family);
    font-size: 0.9375rem;
    font-weight: var(--font-semibold);
    text-align: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-white);
    border: 2px solid var(--color-accent);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background-color: var(--color-white);
    color: var(--color-accent);
    outline: none;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-black);
    border: 2px solid var(--color-black);
}

.btn-outline:hover,
.btn-outline:focus-visible {
    background-color: var(--color-black);
    color: var(--color-white);
    outline: none;
}

.btn-large {
    padding: var(--space-3) var(--space-5);
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

/* Focus States */
:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* ------------------------------------------
   Image Wrapper (1:1 Aspect Ratio)
   ------------------------------------------ */
.image-wrapper {
    position: relative;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    background-color: var(--color-light);
}

.image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
    transition: transform var(--transition-slow);
}

.image-wrapper:hover img {
    transform: scale(1.03);
}

/* ------------------------------------------
   Header
   ------------------------------------------ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--color-white);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.site-header.scrolled {
    border-bottom-color: var(--color-gray-light);
    box-shadow: 0 1px 0 rgba(0,0,0,0.05);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    transition: height var(--transition-base);
}

.site-header.scrolled .header-inner {
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: var(--font-extrabold);
    letter-spacing: -0.02em;
    color: var(--color-black);
}

.logo-accent {
    color: var(--color-accent);
}

/* Navigation */
.main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-5);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.nav-link {
    font-size: 0.875rem;
    font-weight: var(--font-semibold);
    color: var(--color-black);
    padding: var(--space-1) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link:focus-visible {
    color: var(--color-accent);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
    width: 100%;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    padding: 4px;
}

.menu-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-black);
    transition: all var(--transition-base);
    transform-origin: center;
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ------------------------------------------
   Hero
   ------------------------------------------ */
.hero {
    padding-top: calc(80px + var(--space-8));
    padding-bottom: var(--space-8);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    align-items: center;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: var(--font-extrabold);
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-4);
}

.hero-text {
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    line-height: 1.6;
    color: var(--color-gray);
    margin-bottom: var(--space-5);
    max-width: 540px;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    align-items: flex-start;
}

.hero-trust {
    font-size: 0.875rem;
    color: var(--color-gray);
}

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

.hero-image-wrapper {
    width: 100%;
    max-width: 600px;
    border-radius: var(--radius-sm);
}

/* ------------------------------------------
   Sections General
   ------------------------------------------ */
.section {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
}

.section-dark {
    background-color: var(--color-black);
    color: var(--color-white);
}

.section-dark .section-lead,
.section-dark .section-subtitle {
    color: var(--color-gray-light);
}

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

.section-header {
    margin-bottom: var(--space-6);
    max-width: 700px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray);
    margin-top: calc(var(--space-3) * -1);
    margin-bottom: var(--space-4);
}

/* ------------------------------------------
   Problem Section
   ------------------------------------------ */
.problem-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    align-items: center;
}

.problem-facts {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-top: var(--space-5);
}

.fact {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-3);
    align-items: start;
}

.fact-number {
    font-size: 0.875rem;
    font-weight: var(--font-bold);
    color: var(--color-accent);
    padding-top: 2px;
}

.fact-title {
    font-size: 1.125rem;
    font-weight: var(--font-bold);
    margin-bottom: var(--space-1);
}

.fact p {
    font-size: 0.9375rem;
    color: var(--color-gray);
    line-height: 1.5;
}

/* ------------------------------------------
   Solution Section
   ------------------------------------------ */
.solution-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    align-items: center;
}

.solution-content {
    order: 1;
}

.solution-visual {
    order: 2;
}

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

.section-dark .btn-primary:hover,
.section-dark .btn-primary:focus-visible {
    background-color: var(--color-white);
    color: var(--color-accent);
}

/* ------------------------------------------
   Steps Section
   ------------------------------------------ */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-5);
}

.step-visual {
    position: relative;
    margin-bottom: var(--space-4);
}

.step-number {
    position: absolute;
    bottom: var(--space-3);
    left: var(--space-3);
    font-size: 2.5rem;
    font-weight: var(--font-extrabold);
    color: var(--color-white);
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    line-height: 1;
}

.step-title {
    font-size: 1.25rem;
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
}

.step p {
    font-size: 0.9375rem;
    color: var(--color-gray);
    line-height: 1.6;
}

/* ------------------------------------------
   Benefits Section
   ------------------------------------------ */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-5);
}

.benefit {
    padding: var(--space-5);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-light);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.benefit:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.benefit-icon {
    color: var(--color-accent);
    margin-bottom: var(--space-3);
}

.benefit-title {
    font-size: 1.125rem;
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
}

.benefit p {
    font-size: 0.9375rem;
    color: var(--color-gray);
    line-height: 1.6;
}

/* ------------------------------------------
   Material Section
   ------------------------------------------ */
.material-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    align-items: center;
}

.material-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-top: var(--space-5);
}

.material-list li {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-gray-light);
}

.material-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.material-list strong {
    font-size: 1.125rem;
    font-weight: var(--font-bold);
}

.material-list span {
    font-size: 0.9375rem;
    color: var(--color-gray);
    line-height: 1.6;
}

/* ------------------------------------------
   Usecases Section
   ------------------------------------------ */
.usecases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
}

.usecase-image {
    margin-bottom: var(--space-3);
    border-radius: var(--radius-sm);
}

.usecase-title {
    font-size: 1.125rem;
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
}

.usecase p {
    font-size: 0.9375rem;
    color: var(--color-gray);
    line-height: 1.6;
}

/* ------------------------------------------
   Variants Section
   ------------------------------------------ */
.variants-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
}

.variant {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-light);
    transition: border-color var(--transition-base);
}

.variant:hover {
    border-color: var(--color-accent);
}

.variant-image {
    border-bottom: 1px solid var(--color-gray-light);
}

.variant-info {
    padding: var(--space-4);
}

.variant-title {
    font-size: 1.125rem;
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
}

.variant-desc {
    font-size: 0.9375rem;
    color: var(--color-gray);
    line-height: 1.5;
    margin-bottom: var(--space-2);
}

.variant-spec {
    font-size: 0.8125rem;
    font-weight: var(--font-semibold);
    color: var(--color-accent);
    margin-bottom: var(--space-3);
}

/* ------------------------------------------
   Quality Section
   ------------------------------------------ */
.quality-inner {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.quality-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    margin-top: var(--space-6);
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.stat-value {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: var(--font-extrabold);
    color: var(--color-accent);
    line-height: 1;
}

.stat-unit {
    font-size: 0.5em;
    font-weight: var(--font-bold);
    vertical-align: super;
}

.stat-label {
    font-size: 0.875rem;
    font-weight: var(--font-semibold);
    color: var(--color-gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ------------------------------------------
   FAQ Section
   ------------------------------------------ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.faq-item {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color var(--transition-base);
}

.faq-item:hover {
    border-color: var(--color-gray);
}

.faq-item[open] {
    border-color: var(--color-accent);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4);
    font-size: 1.0625rem;
    font-weight: var(--font-semibold);
    cursor: pointer;
    list-style: none;
    transition: color var(--transition-fast);
}

.faq-question::-webkit-details-marker {
    display: none;
}

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

.faq-icon {
    position: relative;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-left: var(--space-3);
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background-color: currentColor;
    transition: transform var(--transition-base);
}

.faq-icon::before {
    top: 7px;
    left: 0;
    width: 16px;
    height: 2px;
}

.faq-icon::after {
    top: 0;
    left: 7px;
    width: 2px;
    height: 16px;
}

.faq-item[open] .faq-icon::after {
    transform: rotate(90deg);
}

.faq-answer {
    padding: 0 var(--space-4) var(--space-4);
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--color-gray);
}

.faq-answer p + p {
    margin-top: var(--space-2);
}

/* ------------------------------------------
   CTA Section
   ------------------------------------------ */
.section-cta {
    text-align: center;
}

.cta-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: var(--font-extrabold);
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

.cta-text {
    font-size: clamp(1.1rem, 1.5vw, 1.25rem);
    color: var(--color-gray-light);
    margin-bottom: var(--space-5);
}

/* ------------------------------------------
   Legal Pages
   ------------------------------------------ */
.section-legal {
    padding-top: calc(80px + var(--space-8));
    padding-bottom: var(--space-8);
}

.legal-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.legal-content h2 {
    font-size: 1.25rem;
    font-weight: var(--font-bold);
    margin-top: var(--space-4);
    margin-bottom: var(--space-2);
}

.legal-content p,
.legal-content li {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--color-gray);
}

.legal-content ul {
    list-style: disc;
    padding-left: var(--space-4);
    margin-bottom: var(--space-2);
}

.legal-content a {
    color: var(--color-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.legal-notice {
    padding: var(--space-4);
    background-color: var(--color-light);
    border-left: 4px solid var(--color-accent);
    color: var(--color-black) !important;
    font-weight: var(--font-medium);
    margin-bottom: var(--space-4);
}

.legal-date {
    margin-top: var(--space-4);
    font-weight: var(--font-semibold);
    color: var(--color-black) !important;
}

/* ------------------------------------------
   Footer
   ------------------------------------------ */
.site-footer {
    background-color: var(--color-black);
    color: var(--color-white);
    padding-top: var(--space-6);
    padding-bottom: var(--space-4);
}

.footer-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    padding-bottom: var(--space-4);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: var(--space-4);
}

.footer-claim {
    font-size: 0.875rem;
    color: var(--color-gray);
    margin-top: var(--space-1);
}

.footer-links {
    display: flex;
    gap: var(--space-4);
}

.footer-links a {
    font-size: 0.875rem;
    font-weight: var(--font-medium);
    color: var(--color-gray);
    transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-links a:focus-visible {
    color: var(--color-white);
}

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: var(--color-gray);
}

/* ------------------------------------------
   Mobile Sticky CTA
   ------------------------------------------ */
.mobile-sticky-cta {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 999;
    padding: var(--space-2) var(--space-4);
    background-color: var(--color-white);
    border-top: 1px solid var(--color-gray-light);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.05);
}

/* ------------------------------------------
   Reveal Animation
   ------------------------------------------ */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays */
.reveal:nth-child(1) { transition-delay: 0ms; }
.reveal:nth-child(2) { transition-delay: 100ms; }
.reveal:nth-child(3) { transition-delay: 200ms; }
.reveal:nth-child(4) { transition-delay: 300ms; }
.reveal:nth-child(5) { transition-delay: 400ms; }
.reveal:nth-child(6) { transition-delay: 500ms; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet (768px - 1023px) */
@media (max-width: 1023px) {
    .breadcrumb-nav {
        top: 64px;
    }

    .hero-inner {
        grid-template-columns: 1fr;
        gap: var(--space-5);
        text-align: center;
    }

    .hero-content {
        order: 1;
    }

    .hero-visual {
        order: 0;
    }

    .hero-actions {
        align-items: center;
    }

    .hero-image-wrapper {
        max-width: 400px;
        margin: 0 auto;
    }

    .problem-grid,
    .solution-grid,
    .material-grid {
        grid-template-columns: 1fr;
        gap: var(--space-5);
    }

    .solution-content {
        order: 0;
    }

    .solution-visual {
        order: 1;
    }

    .steps-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

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

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

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

/* Mobile (< 768px) */
@media (max-width: 767px) {
    :root {
        --space-8: 5rem;
    }

    .breadcrumb-nav {
        display: none;
    }

    .header-inner {
        height: 64px;
    }

    .site-header.scrolled .header-inner {
        height: 56px;
    }

    .header-cta {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-list {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--color-white);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--space-4) var(--container-padding);
        gap: 0;
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }

    .nav-list.active {
        transform: translateX(0);
    }

    .nav-link {
        display: block;
        width: 100%;
        padding: var(--space-3) 0;
        font-size: 1.25rem;
        border-bottom: 1px solid var(--color-gray-light);
    }

    .nav-link::after {
        display: none;
    }

    .hero {
        padding-top: calc(64px + var(--space-5));
        min-height: auto;
    }

    .hero-title {
        font-size: clamp(2rem, 10vw, 3rem);
    }

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

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

    .variants-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .quality-stats {
        gap: var(--space-4);
    }

    .footer-grid {
        flex-direction: column;
        text-align: center;
        gap: var(--space-3);
    }

    .footer-links {
        justify-content: center;
    }

    .mobile-sticky-cta {
        display: block;
    }

    body {
        padding-bottom: 60px;
    }

    .section-legal {
        padding-top: calc(64px + var(--space-5));
    }
}

/* Large Desktop (> 1440px) */
@media (min-width: 1440px) {
    .hero-title {
        font-size: 5.5rem;
    }
}