/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #0e0e0e;
    --color-surface: #181818;
    --color-surface2: #222222;
    --color-border: #333333;
    --color-accent: #c8a84b;
    --color-accent-light: #e2c97e;
    --color-support: #5fb7a7;
    --color-support-dark: #1d4d48;
    --color-text: #e8e8e8;
    --color-text-muted: #999999;
    --color-btn: #c8a84b;
    --color-btn-hover: #e2c97e;
    --radius: 8px;
    --transition: 0.25s ease;
    --max-width: 1100px;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--color-bg);
    color: var(--color-text);
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.7;
    font-size: 16px;
    line-break: strict;
    overflow-wrap: anywhere;
}

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

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

/* ===== HEADER ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(14, 14, 14, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--color-accent);
    text-transform: uppercase;
}

.nav {
    display: flex;
    gap: 24px;
}

.nav a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    transition: color var(--transition);
}

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

/* ===== HERO ===== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1510 50%, #0a0a0a 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 76% 42%, rgba(95, 183, 167, 0.12) 0%, transparent 45%),
        radial-gradient(ellipse at 58% 54%, rgba(200, 168, 75, 0.08) 0%, transparent 70%);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: 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='%23c8a84b' 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");
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1fr);
    gap: 56px;
    align-items: center;
}

.hero-content {
    max-width: 620px;
}

.hero-sub {
    font-size: 1.1rem;
    color: var(--color-accent);
    letter-spacing: 0.15em;
    margin-bottom: 12px;
    font-weight: 400;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    letter-spacing: 0.08em;
    line-height: 1.05;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 30%, var(--color-accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 32px;
    line-height: 1.8;
    text-wrap: balance;
}

.mobile-break {
    display: none;
}

.trust-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 36px;
}

.badge {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 0.82rem;
    letter-spacing: 0.04em;
}

.badge-star {
    background: rgba(200, 168, 75, 0.15);
    border-color: var(--color-accent);
    color: var(--color-accent);
    font-weight: 700;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
}

.hero-visual {
    position: relative;
    min-height: 430px;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1200px;
    overflow: hidden;
}

.hero-visual img {
    width: min(100%, 560px);
    max-height: 430px;
    object-fit: contain;
    filter: drop-shadow(0 28px 48px rgba(0, 0, 0, 0.55));
}

.board-demo {
    position: absolute;
    display: grid;
    gap: 10px;
    padding: 18px;
    border: 1px solid rgba(226, 201, 126, 0.35);
    border-radius: var(--radius);
    background:
        linear-gradient(145deg, rgba(52, 52, 52, 0.92), rgba(12, 12, 12, 0.96)),
        repeating-linear-gradient(90deg, transparent 0 34px, rgba(255, 255, 255, 0.04) 34px 36px);
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.45);
    transform: rotateX(58deg) rotateZ(-28deg);
}

.board-demo span {
    display: block;
    width: 74px;
    height: 124px;
    border-radius: 6px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0)),
        linear-gradient(90deg, #242424, #111);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: inset 0 -10px 18px rgba(0, 0, 0, 0.45);
}

.board-demo span:nth-child(2n) {
    background:
        linear-gradient(180deg, rgba(95, 183, 167, 0.16), rgba(255, 255, 255, 0)),
        linear-gradient(90deg, #252525, #101010);
}

.board-demo-large {
    grid-template-columns: repeat(5, 1fr);
    right: 6%;
    top: 28%;
}

.board-demo-small {
    grid-template-columns: repeat(3, 1fr);
    left: 6%;
    bottom: 14%;
    transform: rotateX(58deg) rotateZ(-28deg) translateZ(30px);
    opacity: 0.9;
}

.hero-visual-caption {
    position: absolute;
    right: 0;
    bottom: 46px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 14px 18px;
    border-left: 3px solid var(--color-support);
    background: rgba(14, 14, 14, 0.72);
    backdrop-filter: blur(8px);
}

.hero-visual-caption strong {
    color: var(--color-accent-light);
    font-size: 1.05rem;
}

.hero-visual-caption span {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 0.06em;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--color-btn);
    color: #000;
}

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

.btn-secondary {
    color: var(--color-text);
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.04);
}

.btn-secondary:hover {
    border-color: var(--color-support);
    color: #ffffff;
    background: rgba(95, 183, 167, 0.12);
    transform: translateY(-2px);
}

.btn-small {
    padding: 8px 20px;
    font-size: 0.85rem;
    background: var(--color-btn);
    color: #000;
    font-weight: 700;
}

.btn-small:hover {
    background: var(--color-btn-hover);
}

/* ===== SECTIONS ===== */
.section {
    padding: 96px 0;
}

.section-title {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: 0.06em;
    margin-bottom: 48px;
    text-align: center;
    position: relative;
    line-height: 1.35;
    text-wrap: balance;
}

.section-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--color-accent);
    margin: 16px auto 0;
    border-radius: 2px;
}

.section-lead {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: 48px;
    font-size: 1.05rem;
}

/* ===== STORY ===== */
.section-story {
    background: var(--color-surface);
}

.story-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.story-text p {
    color: var(--color-text-muted);
    margin-bottom: 20px;
    font-size: 1rem;
    line-height: 1.85;
}

.story-image-placeholder {
    aspect-ratio: 4/3;
    background:
        linear-gradient(135deg, rgba(95, 183, 167, 0.1), transparent 42%),
        linear-gradient(145deg, #242424, #111111);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 22px;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    overflow: hidden;
    position: relative;
}

.story-image-placeholder::before {
    content: '';
    position: absolute;
    inset: 18px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius);
}

.story-visual-board {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(4, 58px);
    gap: 8px;
    padding: 14px;
    background: rgba(0, 0, 0, 0.28);
    border: 1px solid rgba(226, 201, 126, 0.25);
    border-radius: var(--radius);
    transform: rotateX(56deg) rotateZ(-18deg);
}

.story-visual-board span {
    height: 92px;
    border-radius: 5px;
    background: linear-gradient(180deg, #303030, #111111);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.story-visual-note {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.story-visual-note strong {
    color: var(--color-accent-light);
    font-size: 1rem;
}

.story-visual-note span {
    color: var(--color-text-muted);
    font-size: 0.84rem;
}

/* ===== FEATURES ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px 28px;
    transition: border-color var(--transition), transform var(--transition);
}

.feature-card:hover {
    border-color: var(--color-support);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-accent);
    opacity: 0.6;
    margin-bottom: 16px;
    line-height: 1;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 14px;
    line-height: 1.4;
}

.feature-card h3 small {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--color-accent);
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: 0.93rem;
    line-height: 1.8;
}

/* ===== LINEUP ===== */
.section-lineup {
    background: var(--color-surface);
}

.step-block {
    background: var(--color-surface2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 40px;
    margin-bottom: 24px;
}

.step-hidden {
    display: none;
}

.step-header {
    margin-bottom: 28px;
}

.step-num {
    display: inline-block;
    background: var(--color-accent);
    color: #000;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    padding: 4px 12px;
    border-radius: 4px;
    margin-bottom: 10px;
}

.step-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.step-header p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.step-choices {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
}

.choice-btn {
    flex: 1;
    min-width: 160px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px 20px;
    cursor: pointer;
    text-align: left;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.choice-btn:hover,
.choice-btn.selected {
    border-color: var(--color-accent);
    background: rgba(200, 168, 75, 0.08);
}

.choice-label {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    display: block;
    line-height: 1.45;
}

.choice-detail {
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 600;
    display: block;
    line-height: 1.55;
}

.choice-desc {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    display: block;
    margin-top: 4px;
}

/* ===== PRODUCT CARDS ===== */
.product-cards {
    display: none;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.product-cards.visible {
    display: grid;
}

.product-card {
    display: none;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color var(--transition);
}

.product-card:hover {
    border-color: var(--color-accent);
}

.product-card.visible {
    display: block;
}

.product-img-placeholder {
    aspect-ratio: 4/3;
    background:
        linear-gradient(145deg, rgba(95, 183, 167, 0.08), transparent 48%),
        linear-gradient(180deg, #262626 0%, #151515 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    overflow: hidden;
    position: relative;
}

.product-img-placeholder::before {
    content: '';
    width: 74%;
    height: 46%;
    border-radius: 7px;
    border: 1px solid rgba(226, 201, 126, 0.32);
    background:
        repeating-linear-gradient(90deg, #2a2a2a 0 17%, #111111 17% 20%),
        linear-gradient(145deg, rgba(255, 255, 255, 0.08), transparent);
    box-shadow: 0 18px 34px rgba(0, 0, 0, 0.42);
    transform: rotateX(58deg) rotateZ(-22deg);
}

.product-img-placeholder::after {
    content: '';
    position: absolute;
    width: 42%;
    height: 10px;
    bottom: 24%;
    left: 30%;
    border-radius: 999px;
    background: rgba(95, 183, 167, 0.28);
    filter: blur(12px);
}

.product-img-placeholder span {
    position: absolute;
    bottom: 14px;
    right: 16px;
    color: rgba(232, 232, 232, 0.55);
    font-size: 0;
    letter-spacing: 0.04em;
}

.product-img-placeholder span::before {
    content: '製品イメージ';
    font-size: 0.75rem;
}

.product-img-placeholder img {
    position: absolute;
    inset: 0;
    z-index: 1;
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 14px;
}

.product-img-placeholder:has(img)::before,
.product-img-placeholder:has(img)::after {
    display: none;
}

.product-info {
    padding: 20px;
}

.product-info h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.4;
}

.product-info ul {
    list-style: none;
    margin-bottom: 16px;
}

.product-info ul li {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding: 3px 0;
    padding-left: 14px;
    position: relative;
}

.product-info ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* ===== CUSTOM ORDER ===== */
.custom-order-note {
    background: rgba(200, 168, 75, 0.06);
    border: 1px solid rgba(200, 168, 75, 0.3);
    border-radius: var(--radius);
    padding: 32px;
}

.custom-order-note p {
    color: var(--color-text-muted);
    margin-bottom: 20px;
    font-size: 1rem;
}

/* ===== REVIEWS ===== */
.reviews-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 56px;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-num {
    font-size: clamp(2.4rem, 5vw, 3.5rem);
    font-weight: 800;
    color: var(--color-accent);
    line-height: 1;
}

.stat-num small {
    font-size: 1.2rem;
}

.stat-label {
    font-size: 0.88rem;
    color: var(--color-text-muted);
}

.review-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.review-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
}

.review-text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 16px;
    font-style: italic;
}

.review-author {
    font-size: 0.82rem;
    color: var(--color-accent);
    font-weight: 600;
}

/* ===== HOW TO BUY ===== */
.buy-channels {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 48px;
}

.channel-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 20px;
    text-decoration: none;
    transition: all var(--transition);
    text-align: center;
}

.channel-card:hover {
    border-color: var(--color-support);
    transform: translateY(-4px);
    background: rgba(95, 183, 167, 0.08);
}

.channel-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
}

.channel-desc {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

.custom-order-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px;
    text-align: center;
}

.custom-order-section h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.custom-order-section p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    max-width: 600px;
    margin: 0 auto;
}

.buy-note {
    margin-top: 14px !important;
    color: var(--color-accent-light) !important;
    font-size: 0.86rem !important;
}

/* ===== FAQ ===== */
.section-faq {
    background: var(--color-surface);
}

.faq-list {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--color-surface2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color var(--transition);
}

.faq-item:hover {
    border-color: var(--color-accent);
}

.faq-item summary {
    padding: 20px 24px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.98rem;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--color-accent);
    font-weight: 300;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item[open] summary::after {
    content: '−';
}

.faq-item p {
    padding: 0 24px 20px;
    color: var(--color-text-muted);
    font-size: 0.93rem;
    line-height: 1.8;
    border-top: 1px solid var(--color-border);
    margin-top: -1px;
    padding-top: 16px;
}

/* ===== FOOTER ===== */
.site-footer {
    background: #080808;
    border-top: 1px solid var(--color-border);
    padding: 40px 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-brand {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 0.1em;
}

.footer-copy {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {

    .story-grid,
    .features-grid,
    .reviews-stats,
    .review-cards,
    .buy-channels {
        grid-template-columns: 1fr;
    }

    .hero-inner {
        grid-template-columns: 1fr;
        gap: 24px;
        padding-top: 56px;
        padding-bottom: 56px;
    }

    .nav {
        display: none;
    }

    .hero {
        min-height: auto;
    }

    .hero-visual {
        min-height: 320px;
        order: -1;
    }

    .hero-visual img {
        width: min(100%, 520px);
        max-height: 320px;
    }

    .board-demo-large {
        right: 8%;
        top: 22%;
    }

    .board-demo-small {
        left: 8%;
        bottom: 10%;
    }

    .step-choices {
        flex-direction: column;
    }

    .choice-btn {
        min-width: unset;
    }
}

@media (max-width: 600px) {
    .section {
        padding: 64px 0;
    }

    .hero-title {
        font-size: 2.8rem;
        letter-spacing: 0.04em;
    }

    .hero-sub {
        letter-spacing: 0.08em;
    }

    .hero-desc {
        font-size: 1rem;
        line-height: 1.75;
    }

    .mobile-break {
        display: block;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions .btn {
        text-align: center;
    }

    .hero-visual {
        min-height: 260px;
    }

    .hero-visual img {
        max-height: 240px;
    }

    .board-demo {
        gap: 7px;
        padding: 12px;
    }

    .board-demo span {
        width: 42px;
        height: 78px;
    }

    .hero-visual-caption {
        right: 8px;
        bottom: 20px;
    }

    .trust-badges {
        flex-direction: column;
        align-items: flex-start;
    }

    .step-block {
        padding: 24px 16px;
    }

    .story-visual-board {
        grid-template-columns: repeat(4, 42px);
    }

    .story-visual-board span {
        height: 72px;
    }
}