/* ============================================
   リセット & ベーススタイル
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #333333;
    --accent-color: #3b82f6;
    --text-dark: #111827;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-md: 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ============================================
   ヘッダー & ナビゲーション
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 0 rgba(0, 0, 0, 0.05);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar {
    padding: 1.25rem 0;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-dark);
    text-decoration: none;
    letter-spacing: 0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: var(--transition);
    position: relative;
    letter-spacing: 0.01em;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    gap: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    transition: var(--transition);
    border-radius: 2px;
}

/* ============================================
   ヒーローセクション
   ============================================ */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #60a5fa 100%);
    overflow: hidden;
}

.hero-background-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.hero-title-main {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.05em;
}

.hero-title-sub {
    font-size: clamp(1.25rem, 3vw, 2rem);
    font-weight: 300;
    opacity: 0.95;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-bottom-text {
    position: absolute;
    bottom: 60px;
    left: 60px;
    z-index: 2;
    color: var(--text-dark);
    max-width: 600px;
    background: rgba(255, 255, 255, 0.95);
    padding: 2.5rem 3rem;
    border-radius: 8px;
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-bottom-tags {
    font-size: clamp(1.5rem, 3.5vw, 2.5rem);
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 1rem;
    white-space: nowrap;
}

.hero-bottom-description {
    font-size: clamp(1rem, 2vw, 1.5rem);
    line-height: 1.6;
    font-weight: 500;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator span {
    display: block;
    width: 30px;
    height: 50px;
    border: 2px solid white;
    border-radius: 25px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: white;
    border-radius: 50%;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
}

/* ============================================
   ボタン
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.9375rem 2.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 0.9375rem;
    letter-spacing: 0.02em;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: white;
    color: var(--text-dark);
    transform: translateY(-2px);
}

/* ============================================
   セクション共通スタイル
   ============================================ */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 5rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
    position: relative;
    display: inline-block;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    font-weight: 400;
    letter-spacing: 0.01em;
}

.section-content {
    /* コンテンツは後で追加されるため、基本スタイルのみ */
    width: 100%;
}

/* ============================================
   目的と背景セクション
   ============================================ */
.purpose-content {
    max-width: 900px;
    margin: 0 auto;
}

.purpose-text {
    line-height: 1.8;
}

.purpose-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.purpose-list li {
    margin-bottom: 2rem;
    padding-left: 2rem;
    position: relative;
    font-size: 1.125rem;
    color: var(--text-dark);
}

.purpose-list li:before {
    content: "○";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.25rem;
}

.purpose-list li:last-child {
    margin-bottom: 0;
}

.purpose-list strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* ============================================
   狙いセクション
   ============================================ */
.aim-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.aim-concept-title {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.aim-concept-text {
    font-size: clamp(1.25rem, 2.5vw, 2rem);
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 3rem;
}

.aim-image {
    width: 100%;
    margin-bottom: 3rem;
}

.aim-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.aim-result {
    text-align: left;
    max-width: 600px;
    margin: 0 auto;
}

.aim-result-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
}

.aim-result-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.aim-result-list li {
    padding-left: 2rem;
    position: relative;
    font-size: 1.125rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.aim-result-list li:before {
    content: "・";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.5rem;
}

.aim-result-list li:last-child {
    margin-bottom: 0;
}

/* ============================================
   プレイリスト・サンプルセクション
   ============================================ */
.playlist-content {
    width: 100%;
}

.playlist-image {
    width: 100%;
}

.playlist-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

/* ============================================
   システム概要セクション
   ============================================ */
.system-content {
    width: 100%;
}

.system-image {
    width: 100%;
}

.system-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

/* ============================================
   コンテンツジャンルセクション
   ============================================ */
.genres-content {
    width: 100%;
}

.genres-image {
    width: 100%;
}

.genres-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

/* ============================================
   LCBタグセクション
   ============================================ */
#features .features-content {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    grid-template-columns: none;
}

#features .features-text {
    width: 100%;
}

#features .features-tag-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 2rem;
    line-height: 1.6;
    letter-spacing: -0.01em;
}

#features .features-tag-list {
    list-style: none;
    padding: 0;
    margin: 0 0 2rem 0;
}

#features .features-tag-list:last-of-type {
    margin-bottom: 0;
}

#features .features-tag-item-circle {
    padding-left: 2rem;
    position: relative;
    font-size: 1.125rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

#features .features-tag-item-circle:before {
    content: "◎";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.25rem;
}

#features .features-tag-list li:not(.features-tag-item-circle) {
    padding-left: 2rem;
    position: relative;
    font-size: 1.125rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

#features .features-tag-list li:not(.features-tag-item-circle):before {
    content: "・";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.25rem;
}

#features .features-tag-list li:last-child {
    margin-bottom: 0;
}

#features .features-tag-list strong {
    color: var(--primary-color);
    font-weight: 600;
}

#features .features-image {
    width: 100%;
    margin-top: 2rem;
}

#features .features-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

/* ============================================
   会社概要セクション
   ============================================ */
.about {
    background-color: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.about-mission {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text-dark);
    margin-bottom: 2rem;
    font-weight: 500;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.about-stat-item {
    background: rgba(37, 99, 235, 0.1);
    padding: 1.75rem;
    border-radius: 8px;
    border: 1px solid rgba(37, 99, 235, 0.3);
}

.about-stat-label {
    font-size: 1rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.about-stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

.about-logo {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.about-logo img {
    max-width: 100%;
    max-height: 400px;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 8px;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-light);
    font-size: 0.9rem;
}

.about-image-placeholder {
    height: 400px;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dark);
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
}

/* ============================================
   サービスセクション
   ============================================ */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: white;
    padding: 2.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(37, 99, 235, 0.15);
    border-radius: 50%;
}

.service-icon svg {
    width: 40px;
    height: 40px;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.service-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* ============================================
   特徴セクション
   ============================================ */
.features {
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #60a5fa 100%);
    color: var(--text-dark);
}

.features .section-title,
.features .section-subtitle {
    color: var(--text-dark);
}

.features-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.feature-item {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-number {
    font-size: 3rem;
    font-weight: 700;
    opacity: 0.3;
    margin-bottom: 1rem;
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-item p {
    line-height: 1.8;
    color: var(--text-dark);
    opacity: 0.9;
}

/* ============================================
   お問い合わせセクション
   ============================================ */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
}

.contact-info h3 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-icon {
    width: 50px;
    height: 50px;
    min-width: 50px;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(37, 99, 235, 0.15);
    border-radius: 50%;
}

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

.contact-item h4 {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.contact-item p {
    color: var(--text-light);
    line-height: 1.8;
}

.contact-action {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 0;
}

.contact-button-section {
    padding: 3rem 0;
    background-color: var(--bg-light);
}

.btn-large {
    padding: 1.5rem 4.5rem;
    font-size: clamp(1.5rem, 3vw, 2rem);
    min-width: 320px;
    font-weight: 600;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #ffda31 0%, #ff6b35 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 218, 49, 0.3);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.btn-large .btn-text {
    position: relative;
    z-index: 1;
    font-size: clamp(1.5rem, 3vw, 2rem);
}

.btn-large .btn-icon {
    position: relative;
    z-index: 1;
    font-size: clamp(1.5rem, 3vw, 2rem);
    transition: transform 0.3s ease;
}

.btn-large::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.btn-large:hover::before {
    left: 100%;
}

.btn-large:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 218, 49, 0.4);
    background: linear-gradient(135deg, #ffed4e 0%, #ff7a4a 100%);
}

.btn-large:hover .btn-icon {
    transform: translateX(4px);
}

/* ============================================
   フッター
   ============================================ */
.footer {
    background-color: var(--text-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 2.5rem 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-bottom {
    text-align: center;
    padding-top: 0;
    color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   アニメーション
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.8s ease-out;
}

/* ============================================
   レスポンシブデザイン
   ============================================ */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
        gap: 1rem;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero {
        height: 70vh;
        min-height: 400px;
    }

    .hero-bottom-text {
        bottom: 30px;
        left: 20px;
        right: 20px;
        max-width: none;
        padding: 1.5rem 2rem;
    }

    .hero-bottom-tags {
        font-size: clamp(1.25rem, 4vw, 2rem);
        margin-bottom: 0.75rem;
        white-space: normal;
    }

    .hero-bottom-description {
        font-size: clamp(0.9rem, 2.5vw, 1.25rem);
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .service-grid {
        grid-template-columns: 1fr;
    }

    .features-content {
        grid-template-columns: 1fr;
    }

    section {
        padding: 3rem 0;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .btn-large {
        min-width: auto;
        padding: 1.25rem 2rem;
        font-size: 1.125rem;
        white-space: nowrap;
    }

    .btn-large .btn-text {
        font-size: 1.125rem;
    }

    .btn-large .btn-icon {
        font-size: 1.125rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        height: 60vh;
        min-height: 350px;
    }

    .hero-title-main {
        font-size: 2rem;
    }

    .hero-title-sub {
        font-size: 1.125rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .btn-large {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }

    .btn-large .btn-text {
        font-size: 1rem;
    }

    .btn-large .btn-icon {
        font-size: 1rem;
    }
}