/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f8f8;
    --bg-card: #ffffff;
    --bg-card-hover: #fafafa;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --border: #e5e5e5;
    --shadow: rgba(0, 0, 0, 0.08);
    --shadow-hover: rgba(0, 0, 0, 0.12);
}

body {
    font-family: 'Atkinson Hyperlegible', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navigation Bar */
.navbar {
    position: sticky;
    top: 0;
    border-bottom: 1px dotted var(--border);
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.nav-container {
    max-width: 1400px;
    width: 100%;
    padding: 2rem 2rem;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.01em;
    transition: opacity 0.2s;
    font-family: inherit;
}

.nav-logo:hover {
    opacity: 0.7;
}

.nav-link {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-primary);
    text-decoration: none;
    transition: opacity 0.2s;
    font-family: inherit;
}

.nav-link:hover {
    opacity: 0.7;
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    align-items: center;
    padding: 5rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    border-top: 1px dotted var(--border);
    border-bottom: 1px dotted var(--border);
    position: relative;
}

.hero-asterisk {
    font-size: 20rem;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1;
    text-align: left;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    font-family: inherit;
    padding-top: 0;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding-left: 2rem;
}

.hero-title {
    font-size: 5.5rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin: 0;
    font-family: 'Inter Tight', sans-serif;
}

.hero-subtitle {
    font-size: 1.05rem;
    line-height: 1.5;
    color: var(--text-secondary);
    font-weight: 500;
    margin-top: 0.75rem;
    margin-left: 6.5rem;
    font-family: 'Inter Tight', sans-serif;
}

.hero-description {
    margin-top: 1.6rem;
    max-width: 34rem;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Category Buttons Section */
.category-buttons-section {
    padding: 3rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    border-bottom: 1px dotted var(--border);
}

.category-buttons-container {
    display: flex;
    justify-content: center;
    width: 100%;
}

/* Category Buttons */
.category-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    max-width: 100%;
}

.category-button {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
    text-decoration: none;
}

.category-button:hover {
    background: var(--bg-secondary);
    border-color: var(--text-primary);
}

.category-button-icon {
    font-size: 0.75rem;
    display: flex;
    align-items: center;
}

.category-button-text {
    font-size: 0.8rem;
    font-weight: 400;
}

/* Main Content */
main {
    flex: 1;
    padding: 3rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Loading State */
.loading {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Error State */
.error {
    text-align: center;
    padding: 4rem 2rem;
    color: #ef4444;
    font-size: 1.1rem;
}

/* Models Grid */
.models-grid {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    padding: 1rem 0;
}

/* Category Header */
.category-header {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: #363636;
    color: #ffffff;
    padding: 0.75rem 1.5rem;
    border-radius: 7.5px;
    font-size: 1rem;
    font-weight: 400;
    font-family: inherit;
    margin-bottom: 1.5rem;
    scroll-margin-top: 100px;
}

.category-icon {
    font-size: 1.1rem;
    display: flex;
    align-items: center;
}

.category-text {
    font-size: 1rem;
    font-weight: 400;
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Model Card */
.model-card {
    background: var(--bg-card);
    border-radius: 0;
    overflow: hidden;
    cursor: pointer;
    transition: opacity 0.3s ease, transform 0.3s ease;
    border: none;
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: none;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}


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

.model-card:hover {
    transform: translateY(-2px);
}

/* Video Container */
.video-container {
    width: 100%;
    aspect-ratio: 3 / 4;
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
    transform-origin: center center;
}

.model-card:hover .video-container video {
    transform: scale(1.12);
}

/* Placeholder for missing videos */
.video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #e8e8e8 100%);
    color: var(--text-secondary);
    font-size: 3rem;
}

.video-placeholder::before {
    content: '🎨';
    font-size: 4rem;
    opacity: 0.5;
}

/* Card Content */
.card-content {
    padding: 1rem 0;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 400;
    margin: 0;
    color: var(--text-primary);
    line-height: 1.3;
    letter-spacing: -0.01em;
    font-family: inherit;
}

/* Tags */
.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    margin-top: 0;
}

.tag {
    display: inline-block;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color 0.2s ease;
    font-weight: 400;
    font-family: inherit;
}

.tag:not(:last-child)::after {
    content: ' • ';
    margin: 0 0.5rem;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    margin-top: 6rem;
    padding: 4rem 2rem;
    background: var(--bg-primary);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
    text-align: center;
}

.footer-text {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    line-height: 1.6;
    max-width: 600px;
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    font-size: 0.95rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: opacity 0.2s;
    font-weight: 400;
}

.footer-link:hover {
    opacity: 0.6;
}

.footer-copyright {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* Responsive Design */
@media (max-width: 1400px) {
    .category-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 1200px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

@media (max-width: 968px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 4rem 2rem;
    }

    .hero-asterisk {
        font-size: 8rem;
        order: 1;
    }

    .hero-content {
        order: 2;
        padding-left: 0;
        text-align: center;
    }

    .hero-title {
        font-size: 3.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .category-buttons-section {
        padding: 2rem 1.5rem;
    }

    .category-buttons {
        gap: 0.4rem;
    }

    .category-button {
        font-size: 0.75rem;
        padding: 0.35rem 0.65rem;
        border-radius: 5px;
    }

    .category-button-icon {
        font-size: 0.7rem;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 1.5rem 1.5rem;
    }

    .nav-logo {
        font-size: 0.95rem;
    }

    .nav-link {
        font-size: 0.95rem;
    }

    .hero {
        padding: 3rem 1.5rem;
    }

    .hero-asterisk {
        font-size: 6rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .category-buttons-section {
        padding: 2rem 1rem;
    }

    main {
        padding: 2rem 1rem;
    }

    .category-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .card-content {
        padding: 1.25rem;
    }

    .footer {
        padding: 3rem 1.5rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-asterisk {
        font-size: 5rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .category-grid {
        gap: 1rem;
    }

    .footer {
        padding: 2rem 1rem;
    }
}

/* Smooth scroll behavior */
html {
    scroll-behavior: smooth;
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(1rem);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    font-family: inherit;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    background: var(--text-primary);
    transform: translateY(-0.25rem);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.scroll-to-top:active {
    transform: translateY(-0.1rem);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.scroll-to-top svg {
    transition: transform 0.2s ease;
}

.scroll-to-top:hover svg {
    transform: translateY(-2px);
}

/* Responsive adjustments for scroll button */
@media (max-width: 768px) {
    .scroll-to-top {
        width: 3rem;
        height: 3rem;
        bottom: 1.5rem;
        right: 1.5rem;
    }

    .scroll-to-top svg {
        width: 18px;
        height: 18px;
    }
}

@media (max-width: 480px) {
    .scroll-to-top {
        width: 2.75rem;
        height: 2.75rem;
        bottom: 1.25rem;
        right: 1.25rem;
    }

    .scroll-to-top svg {
        width: 16px;
        height: 16px;
    }
}