/* Base Tokens */
:root {
    --bg-color: #0c0c0c;
    --card-bg: #161616;
    --text-primary: #f0f0f0;
    --text-secondary: #aaaaaa;
    --accent-color: #ffbf00;
    /* Amber */
    --accent-hover: #ffd700;
    --border-color: #2a2a2a;
    --serif-font: 'Noto Serif JP', serif;
    --sans-font: 'Inter', system-ui, sans-serif;
    --container-width: 1100px;
    --header-height: 80px;
}

/* Reset & Global */
* {
    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(--serif-font);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
    transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

ul {
    list-style: none;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 120px 0;
}

.center {
    text-align: center;
}

.mt-2 {
    margin-top: 20px;
}

.mt-4 {
    margin-top: 40px;
}

/* Header Navigation */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: transparent;
    z-index: 1000;
    transition: 0.4s;
    border-bottom: 1px solid transparent;
}

#header.scrolled {
    background: rgba(12, 12, 12, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    height: 70px;
}

.header-inner {
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--accent-color);
}

.nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.9rem;
    font-family: var(--sans-font);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color);
}

/* Buttons */
.btn-primary {
    display: inline-block;
    padding: 14px 40px;
    background-color: var(--accent-color);
    color: #000;
    font-family: var(--sans-font);
    font-weight: 700;
    border-radius: 4px;
    box-shadow: 0 4px 20px rgba(255, 191, 0, 0.15);
}

.btn-primary:hover {
    transform: translateY(-2px);
    background-color: var(--accent-hover);
}

.btn-outline {
    display: inline-block;
    padding: 12px 32px;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    background: transparent;
    font-size: 0.9rem;
    border-radius: 4px;
}

.btn-outline:hover {
    background: rgba(255, 191, 0, 0.1);
}

/* Home Hero */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.8)), url('images/hero_bg.png') no-repeat center center/cover;
}

.hero-inner {
    max-width: 800px;
}

.hero-tagline {
    font-size: 1rem;
    color: var(--accent-color);
    margin-bottom: 16px;
    display: block;
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 24px;
    word-break: keep-all;
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 40px;
}

/* Subpage Layout */
.page-hero {
    padding-top: calc(var(--header-height) + 60px);
    padding-bottom: 80px;
    background: linear-gradient(rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.9)), url('images/hero_bg.png') no-repeat center center/cover;
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 16px;
}

.breadcrumb {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: var(--sans-font);
}

.breadcrumb a {
    margin: 0 8px;
}

.breadcrumb a:hover {
    color: var(--accent-color);
}

/* Components */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.card {
    background: var(--card-bg);
    padding: 40px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: 0.3s;
}

.card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--accent-color);
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 24px 0;
}

.faq-q {
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-q::after {
    content: '+';
    color: var(--accent-color);
    font-size: 1.5rem;
    transition: 0.3s;
}

.faq-item.active .faq-q::after {
    transform: rotate(45deg);
}

.faq-a {
    margin-top: 16px;
    color: var(--text-secondary);
    display: none;
}

.faq-item.active .faq-a {
    display: block;
}

/* Footer */
#footer {
    padding: 80px 0 40px;
    background: #080808;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 60px;
}

.footer-nav {
    display: flex;
    gap: 40px;
}

.footer-nav ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .section {
        padding: 80px 0;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .nav {
        display: none;
    }

    /* Mobile nav implementation would go here */
    .footer-inner {
        flex-direction: column;
        gap: 40px;
    }
}