/* =========================================
   Nirai Studio - Project Detail Page CSS
   ========================================= */

:root {
    --bg-color: #ffffff;
    --text-primary: #121212;
    --text-secondary: #333333;
    --border-color: rgba(0, 0, 0, 0.1);

    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-weight: 300;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 200;
    letter-spacing: -0.02em;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast), opacity var(--transition-fast);
}

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

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    z-index: 1000;
    background: rgba(255, 255, 255, 0.97);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(8px);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1600px;
    margin: 0 auto;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    letter-spacing: 0.2em;
    font-weight: 400;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--text-primary);
    transition: width var(--transition-fast);
}

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

/* --- Project Page Layout --- */

.project-page {
    padding-top: 110px;
    max-width: 1600px;
    margin: 0 auto;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
    padding-bottom: var(--spacing-xl);
}

/* Back link */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: var(--spacing-md);
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}

.back-link:hover {
    opacity: 1;
}

.back-link span {
    font-size: 1rem;
}

/* Project Header */
.project-header {
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-md);
}

.project-header h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
    margin-bottom: 0.25rem;
}

.project-header .year-tag {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-secondary);
}

/* Hero Image */
.project-hero-image {
    width: 100%;
    aspect-ratio: 16/7;
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
    background: #f0f0f0;
}

.project-hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Gallery Grid */
.gallery-section h2 {
    font-size: 1.5rem;
    font-weight: 200;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.project-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.gallery-item {
    overflow: hidden;
    background: #f0f0f0;
    aspect-ratio: 4/3;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 1.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.gallery-item:hover img {
    transform: scale(1.04);
}

/* Single large image for projects with only one */
.gallery-item.full-width {
    grid-column: 1 / -1;
    aspect-ratio: 16/7;
}

/* Footer */
footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background-color: #fafafa;
    margin-top: var(--spacing-xl);
}

.footer-content {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

/* Fade In */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: none;
}

/* Responsive */
@media (max-width: 1100px) {
    .project-gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-md: 1.2rem;
    }

    .project-gallery {
        grid-template-columns: 1fr;
    }

    .nav-links {
        display: none;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}