/* 
   Premium Sauna LP Styles
   Theme: Minimalist, Apple-like, Glassmorphism, Dark Mode
*/

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

:root {
    --color-bg: #050505; /* Deep pure dark */
    --color-surface: rgba(25, 25, 25, 0.6);
    --color-surface-hover: rgba(40, 40, 40, 0.8);
    --color-text: #f5f5f7;
    --color-text-muted: #86868b;
    --color-primary: #bda678; /* Elegant Copper/Gold */
    --color-primary-glow: rgba(189, 166, 120, 0.3);
    
    --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2.5rem;
    --spacing-lg: 5rem;
    --spacing-xl: 10rem;
    
    --radius-md: 16px;
    --radius-lg: 24px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

/* Animations (Scroll Revealed) */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 1s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Typography Details */
h1, h2, h3 {
    font-weight: 300;
    letter-spacing: 0.03em;
}

/* Header (Glassmorphism) */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 3rem;
    z-index: 100;
    background: rgba(5, 5, 5, 0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: padding 0.4s ease;
}

.header.scrolled {
    padding: 1rem 3rem;
}

.logo {
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    background: linear-gradient(135deg, #fff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav {
    display: flex;
    gap: 3rem;
}

.nav a {
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary {
    background-color: var(--color-text);
    color: var(--color-bg);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255, 255, 255, 0.15);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
    background-color: var(--color-text);
    color: var(--color-bg);
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(5,5,5,0.2) 0%, rgba(5,5,5,0.8) 80%, rgba(5,5,5,1) 100%);
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.1);
    animation: slowZoom 25s infinite alternate ease-in-out;
}

@keyframes slowZoom {
    0% { transform: scale(1.1); }
    100% { transform: scale(1.2); }
}

.hero-content {
    text-align: center;
    z-index: 1;
    padding: 0 var(--spacing-md);
    margin-top: 4rem;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5.5rem);
    font-weight: 300;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    text-shadow: 0 20px 40px rgba(0,0,0,0.8);
    background: linear-gradient(to bottom, #ffffff 0%, #b0b0b0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
    letter-spacing: 0.1em;
}

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

.section-title {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.3em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    text-transform: uppercase;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: center;
}

.about-text h3 {
    font-size: clamp(2rem, 3vw, 2.8rem);
    font-weight: 400;
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.about-text p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
    font-size: 1.05rem;
}

.image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0,0,0,0.6);
}

.image-wrapper::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    pointer-events: none;
}

.image-wrapper img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.image-wrapper:hover img {
    transform: scale(1.05);
}

/* Rooms Section */
.room-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(350px, 100%), 1fr));
    gap: 3rem;
}

.card {
    background: var(--color-surface);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.card:hover {
    background: var(--color-surface-hover);
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    border-color: rgba(255,255,255,0.1);
}

.card-img-wrapper {
    overflow: hidden;
}

.card img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.card:hover img {
    transform: scale(1.05);
}

.card-content {
    padding: 2.5rem;
}

.card-content h3 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 1rem;
}

.card-content p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

.price-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1.5rem;
}

.price {
    font-weight: 500;
    font-size: 1.1rem;
    color: var(--color-primary);
}

/* CTA Section */
.cta-section {
    position: relative;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-lg);
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 60%);
    z-index: -1;
    pointer-events: none;
}

.cta-section h2 {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 300;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.cta-section p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
}

/* Footer */
.footer {
    padding: var(--spacing-lg) 0 var(--spacing-md);
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer .logo {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.copyright {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.3);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 1rem 1.5rem;
    }
    .nav {
        display: none;
    }
    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .section {
        padding: 5rem 0;
    }
}