/* CSS Variables */
:root {
    /* Colors */
    --bg-light: #ffffff;
    --bg-dark: #000000;
    --bg-darker: #111111;
    --bg-gray: #f5f5f7;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --text-light: #f5f5f7;
    --text-light-secondary: #a1a1a6;
    --accent: #2997ff;
    --accent-hover: #0071e3;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, 'Noto Sans JP', sans-serif;
    
    /* Spacing */
    --section-pad: 8rem 2rem;
    --nav-height: 48px;
    
    /* Transitions */
    --transition-smooth: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-light);
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

ul {
    list-style: none;
}

/* Typography Utility */
.text-center { text-align: center; }
.text-balance { text-wrap: balance; }
.ib { display: inline-block; }
.mt-4 { margin-top: 2rem; }
.mb-5 { margin-bottom: 3rem; }

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    transition: var(--transition-smooth);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.navbar.dark-nav {
    background: rgba(0, 0, 0, 0.7);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    color: var(--text-light);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.navbar.dark-nav .nav-links a {
    color: var(--text-light-secondary);
}

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

.navbar.dark-nav .nav-links a:hover {
    color: var(--text-light);
}

.btn-primary-small {
    background: var(--text-primary);
    color: var(--bg-light) !important;
    padding: 0.4rem 1rem;
    border-radius: 980px;
    font-size: 0.8rem !important;
}

.navbar.dark-nav .btn-primary-small {
    background: var(--bg-light);
    color: var(--text-primary) !important;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.menu-toggle .bar {
    width: 20px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-smooth);
}
.navbar.dark-nav .menu-toggle .bar {
    background-color: var(--bg-light);
}

/* Hero Section */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background-color: var(--bg-dark);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: brightness(0.7);
    transform: scale(1.05); /* Slight zoom for image */
    transition: transform 10s ease-out;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.6) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--text-light);
    max-width: 800px;
    padding: 0 2rem;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.5rem);
    font-weight: 300;
    color: rgba(255,255,255,0.9);
    margin-bottom: 2rem;
    letter-spacing: 0.05em;
}

.btn-primary {
    display: inline-block;
    background: var(--text-light);
    color: var(--bg-dark);
    padding: 1rem 2.5rem;
    border-radius: 980px;
    font-size: 1.1rem;
    font-weight: 500;
    transition: transform 0.3s ease, background 0.3s ease;
}

.btn-primary:hover {
    transform: scale(1.05);
    background: rgba(255,255,255,0.9);
}

.btn-primary-large {
    display: inline-block;
    background: var(--text-primary);
    color: var(--text-light);
    padding: 1rem 3rem;
    border-radius: 980px;
    font-size: 1.1rem;
    font-weight: 500;
}

/* Base Sections */
.section {
    padding: var(--section-pad);
}

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

.section-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.dark-section .section-subtitle {
    color: var(--text-light-secondary);
}

.section-text {
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--text-primary);
    max-width: 600px;
}

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

/* Split Sections */
.split-section {
    display: flex;
    min-height: 100vh;
    padding: 0;
    align-items: stretch;
}

.split-section.reverse {
    flex-direction: row-reverse;
}

.split-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem;
}

.content-wrapper {
    max-width: 500px;
    width: 100%;
}

.split-image {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.split-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 1.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.area-badge {
    display: inline-block;
    margin-top: 2rem;
    padding: 0.5rem 1rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 8px;
    font-size: 0.9rem;
}

/* Center Section */
.center-section {
    background: var(--bg-gray);
    display: flex;
    justify-content: center;
}

.container {
    max-width: 1000px;
    width: 100%;
}

.grid-2-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 3rem;
}

.info-card {
    background: var(--bg-light);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
}

.info-card h4 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.bullet-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.8rem;
    color: var(--text-secondary);
}

.bullet-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 1.2rem;
}

.info-row {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    margin-bottom: 1rem;
}

.info-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.info-value {
    font-size: 1.1rem;
    font-weight: 500;
}

/* Contact Section */
.contact-section {
    padding: 8rem 2rem;
    display: flex;
    justify-content: center;
    background: var(--bg-light);
}

.contact-container {
    max-width: 600px;
    width: 100%;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    background: var(--bg-gray);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: left;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 1rem;
    background: var(--bg-light);
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(41, 151, 255, 0.2);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form button[type="submit"] {
    cursor: pointer;
    border: none;
    width: 100%;
}

/* Footer */
.footer {
    background: var(--bg-darker);
    color: var(--text-light-secondary);
    padding: 3rem 2rem;
    text-align: center;
}

.footer-logo {
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.copyright {
    font-size: 0.85rem;
}

/* Scroll Animations */
.reveal {
    opacity: 0;
    transition: var(--transition-smooth);
}

.reveal.active {
    opacity: 1;
    transform: translate(0, 0) scale(1);
}

.fade-up {
    transform: translateY(40px);
}

.fade-in-left {
    transform: translateX(-40px);
}

.fade-in-right {
    transform: translateX(40px);
}

/* Responsive Design */
@media (max-width: 968px) {
    .split-section {
        flex-direction: column !important;
    }
    .split-content, .split-image {
        flex: none;
        width: 100%;
    }
    .split-image {
        height: 50vh;
    }
    .split-content {
        padding: 4rem 2rem;
    }
    .grid-2-col {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* simple mobile hide for now */
    }
    .menu-toggle {
        display: flex;
    }
    .hero-title {
        font-size: 3rem;
    }
    .section-title {
        font-size: 2.5rem;
    }
    .info-card {
        padding: 2rem;
    }
}

/* ===== Album Scrum Partnership Section ===== */
.partner-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 2rem;
    padding: 0.3rem 1rem;
    margin-bottom: 1.5rem;
}

.album-scrum-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin: 3rem 0;
}

.as-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 1rem;
    padding: 2rem 1.5rem;
    text-align: center;
    transition: var(--transition-smooth);
}

.as-card:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(41, 151, 255, 0.4);
    transform: translateY(-4px);
}

.as-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.as-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 0.6rem;
}

.as-card p {
    font-size: 0.9rem;
    color: var(--text-light-secondary);
    line-height: 1.6;
}

.as-cta-wrap {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.btn-outline {
    display: inline-block;
    padding: 0.75rem 2rem;
    border: 1px solid rgba(255,255,255,0.4);
    border-radius: 2rem;
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-smooth);
    margin-top: 2rem;
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(41,151,255,0.08);
}

.as-note {
    font-size: 0.78rem;
    color: var(--text-light-secondary);
    margin-top: 3rem;
    opacity: 0.7;
    text-align: center;
}

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

@media (max-width: 540px) {
    .album-scrum-grid {
        grid-template-columns: 1fr;
    }
    .as-cta-wrap {
        flex-direction: column;
        align-items: center;
    }
}