:root {
    --color-black: #0d0d0d;
    --color-charcoal: #1a1a1a;
    --color-dark: #252525;
    --color-medium: #4a4a4a;
    --color-muted: #7a7a7a;
    --color-light: #f7f6f4;
    --color-cream: #faf9f7;
    --color-gold: #c4a35a;
    --color-gold-light: #d9c48b;
    --color-gold-pale: rgba(196, 163, 90, 0.15);
    
    --font-display: 'Shippori Mincho', serif;
    --font-body: 'Noto Serif JP', serif;
    
    --ease-elegant: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
    font-family: var(--font-body);
    color: var(--color-charcoal);
    background-color: var(--color-cream);
    line-height: 1.9;
    font-weight: 400;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.sp-only {
    display: none;
}

@media (max-width: 640px) {
    .sp-only {
        display: inline;
    }
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #1a1a1a 0%, #0d0d0d 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.35) saturate(0.8);
    transform: scale(1.05);
    animation: slowZoom 20s ease-in-out infinite alternate;
}

@keyframes slowZoom {
    from { transform: scale(1.05); }
    to { transform: scale(1.1); }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at center, transparent 0%, rgba(13, 13, 13, 0.4) 100%),
        linear-gradient(180deg, rgba(13, 13, 13, 0.2) 0%, rgba(13, 13, 13, 0.4) 100%);
    z-index: 1;
}

/* Decorative Lines */
.deco-line {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--color-gold), transparent);
    z-index: 2;
    opacity: 0.4;
}

.deco-line-top {
    top: 0;
    height: 80px;
    animation: fadeInDown 1.5s var(--ease-elegant) 0.5s backwards;
}

.deco-line-bottom {
    bottom: 0;
    height: 80px;
    animation: fadeInUp 1.5s var(--ease-elegant) 0.5s backwards;
}

/* Decorative Corners */
.deco-corner {
    position: absolute;
    width: 60px;
    height: 60px;
    border-color: var(--color-gold);
    border-style: solid;
    border-width: 0;
    z-index: 2;
    opacity: 0.3;
}

.deco-corner-tl {
    top: 40px;
    left: 40px;
    border-top-width: 1px;
    border-left-width: 1px;
    animation: fadeIn 1s var(--ease-elegant) 1s backwards;
}

.deco-corner-tr {
    top: 40px;
    right: 40px;
    border-top-width: 1px;
    border-right-width: 1px;
    animation: fadeIn 1s var(--ease-elegant) 1.1s backwards;
}

.deco-corner-bl {
    bottom: 40px;
    left: 40px;
    border-bottom-width: 1px;
    border-left-width: 1px;
    animation: fadeIn 1s var(--ease-elegant) 1.2s backwards;
}

.deco-corner-br {
    bottom: 40px;
    right: 40px;
    border-bottom-width: 1px;
    border-right-width: 1px;
    animation: fadeIn 1s var(--ease-elegant) 1.3s backwards;
}

@media (max-width: 640px) {
    .deco-corner {
        width: 30px;
        height: 30px;
    }
    .deco-corner-tl, .deco-corner-tr { top: 20px; }
    .deco-corner-bl, .deco-corner-br { bottom: 20px; }
    .deco-corner-tl, .deco-corner-bl { left: 20px; }
    .deco-corner-tr, .deco-corner-br { right: 20px; }
}

/* Hero Content */
.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    padding: 2rem;
    max-width: 800px;
}

/* Coming Soon Badge */
.coming-soon-badge {
    display: inline-block;
    margin-bottom: 2.5rem;
    animation: fadeInDown 1s var(--ease-elegant) 0.3s backwards;
}

.badge-text {
    display: inline-block;
    padding: 0.6rem 2rem;
    border: 1px solid var(--color-gold);
    color: var(--color-gold);
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.35em;
    position: relative;
}

.badge-text::before,
.badge-text::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 30px;
    height: 1px;
    background: var(--color-gold);
    opacity: 0.5;
}

.badge-text::before {
    right: 100%;
    margin-right: 15px;
}

.badge-text::after {
    left: 100%;
    margin-left: 15px;
}

/* Hero Title */
.hero-title {
    margin-bottom: 2.5rem;
    animation: fadeIn 1.2s var(--ease-elegant) 0.6s backwards;
}

.title-sub {
    display: block;
    font-family: var(--font-body);
    font-size: clamp(0.8rem, 2vw, 0.95rem);
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 0.25em;
    margin-bottom: 1rem;
    font-weight: 300;
}

.title-main {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(2rem, 6vw, 3.5rem);
    color: #fff;
    font-weight: 500;
    letter-spacing: 0.15em;
    line-height: 1.3;
}

/* Release Date */
.release-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 3rem;
    animation: fadeIn 1.2s var(--ease-elegant) 0.9s backwards;
}

.release-label {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.2em;
    margin-bottom: 0.5rem;
}

.release-time {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 8vw, 4rem);
    color: var(--color-gold);
    font-weight: 400;
    letter-spacing: 0.05em;
    line-height: 1;
}

.release-season {
    font-size: 0.45em;
    vertical-align: middle;
    margin-left: 0.2em;
    color: var(--color-gold-light);
}

/* Hero Description */
.hero-description {
    font-size: clamp(0.9rem, 2vw, 1.05rem);
    color: rgba(255, 255, 255, 0.8);
    line-height: 2.2;
    font-weight: 300;
    letter-spacing: 0.05em;
    animation: fadeInUp 1s var(--ease-elegant) 1.2s backwards;
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Section Styles ===== */
section {
    padding: 6rem 2rem;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.title-en {
    display: block;
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--color-gold);
    letter-spacing: 0.3em;
    margin-bottom: 0.8rem;
}

.title-ja {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 3vw, 1.8rem);
    color: var(--color-charcoal);
    font-weight: 500;
    letter-spacing: 0.15em;
}

.section-title-light .title-ja {
    color: #fff;
}

.section-title-light .title-en {
    color: var(--color-gold-light);
}

/* ===== Overview Section ===== */
.overview {
    background: var(--color-cream);
    position: relative;
}

.overview::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, var(--color-gold), transparent);
    opacity: 0.5;
}

.overview-inner {
    max-width: 900px;
    margin: 0 auto;
}

.overview-content {
    text-align: center;
    margin-bottom: 5rem;
}

.overview-lead {
    font-family: var(--font-display);
    font-size: clamp(1rem, 2.5vw, 1.15rem);
    color: var(--color-dark);
    line-height: 2.4;
    letter-spacing: 0.08em;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
}

.feature-item {
    text-align: center;
    padding: 2rem 1.5rem;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    transition: all 0.4s var(--ease-elegant);
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-gold);
    transition: width 0.4s var(--ease-elegant);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.06);
}

.feature-item:hover::before {
    width: 100%;
}

.feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-gold);
    border-radius: 50%;
    color: var(--color-gold);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    color: var(--color-charcoal);
    margin-bottom: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1em;
}

.feature-desc {
    font-size: 0.85rem;
    color: var(--color-muted);
    line-height: 1.9;
}

/* ===== Flow Section ===== */
.flow {
    background: linear-gradient(135deg, var(--color-charcoal) 0%, var(--color-black) 100%);
    position: relative;
}

.flow::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23c4a35a' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.flow-inner {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.flow-steps {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.flow-step {
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    padding: 2.5rem 0;
    position: relative;
}

.flow-step:not(:last-child) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.step-number {
    flex-shrink: 0;
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--color-gold);
    opacity: 0.7;
    line-height: 1;
    letter-spacing: 0.05em;
}

.step-content {
    flex: 1;
}

.step-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: #fff;
    margin-bottom: 0.6rem;
    font-weight: 500;
    letter-spacing: 0.1em;
}

.step-desc {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.8;
}

@media (max-width: 640px) {
    .flow-step {
        flex-direction: column;
        gap: 1rem;
    }
    
    .step-number {
        font-size: 1.5rem;
    }
}

/* ===== Footer ===== */
.footer {
    background: var(--color-black);
    padding: 3rem 2rem;
}

.footer-inner {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    margin-bottom: 1.5rem;
}

.brand-main {
    display: block;
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--color-gold);
    letter-spacing: 0.2em;
    margin-bottom: 0.5rem;
}

.brand-sub {
    display: block;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 0.1em;
}

.footer-copy {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.3);
    letter-spacing: 0.05em;
}

/* ===== Scroll Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--ease-elegant), transform 0.8s var(--ease-elegant);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    section {
        padding: 4rem 1.5rem;
    }
    
    .hero-content {
        padding: 1.5rem;
    }
}