/**
 * EduOne フロントページ用スタイルシート
 * ブランドコンセプト: "One world, One learning."
 * デザイン: 教育的・アカデミック、暖色系
 */

/* ========================================
   基本設定
   ======================================== */

:root {
    /* カラーパレット（暖色系） */
    --primary-color: #E8742F;
    --primary-dark: #C45E1F;
    --secondary-color: #F4A261;
    --accent-color: #E76F51;
    --background-light: #FAF3E0;
    --background-white: #FFFFFF;
    --text-dark: #264653;
    --text-medium: #2A9D8F;
    --text-light: #6B7280;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--background-light);
}

/* ========================================
   ヘッダー
   ======================================== */

.site-header {
    background-color: var(--background-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-dark);
}

.logo-icon {
    width: 3.5rem;
    height: 3.5rem;
    object-fit: contain;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-name {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-domain {
    font-size: 0.875rem;
    color: var(--text-light);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* ログインボタン */
.login-button {
    padding: 0.625rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

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

.login-button i {
    font-size: 1rem;
}

/* ========================================
   ヒーローセクション
   ======================================== */

.hero {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    color: white;
    padding: 5rem 2rem;
    text-align: center;
}

.hero-container {
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-tagline {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    opacity: 0.95;
}

.hero-subtitle {
    font-size: 1.125rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    font-style: italic;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--background-white);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.125rem;
    transition: all 0.3s;
    box-shadow: var(--shadow-md);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.cta-button i {
    margin-left: 0.5rem;
}

/* ========================================
   製品セクション
   ======================================== */

.products {
    padding: 5rem 2rem;
    background-color: var(--background-white);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.product-card {
    background-color: var(--background-white);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.product-card.active {
    border-color: var(--primary-color);
    background: linear-gradient(to bottom right, var(--background-white), var(--background-light));
}

.product-card.coming-soon {
    opacity: 0.6;
    cursor: not-allowed;
}

.product-card.coming-soon:hover {
    transform: none;
    box-shadow: none;
}

.product-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.product-card.coming-soon .product-icon {
    color: var(--text-light);
}

.product-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.product-status {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--secondary-color);
    color: white;
    font-size: 0.75rem;
    border-radius: 12px;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.product-status.coming {
    background-color: var(--text-light);
}

.product-card p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.product-features {
    list-style: none;
    margin-top: 1rem;
}

.product-features li {
    padding: 0.5rem 0;
    color: var(--text-medium);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.product-features li i {
    color: var(--primary-color);
}

/* ========================================
   フッター
   ======================================== */

.site-footer {
    background-color: var(--text-dark);
    color: white;
    padding: 3rem 2rem 1.5rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    line-height: 1.8;
}

.footer-section a:hover {
    color: var(--secondary-color);
}

.footer-links {
    list-style: none;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* ========================================
   レスポンシブデザイン
   ======================================== */

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .login-button {
        width: 100%;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-tagline {
        font-size: 1rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

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

    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 3rem 1rem;
    }

    .products {
        padding: 3rem 1rem;
    }

    .cta-button {
        padding: 0.875rem 2rem;
        font-size: 1rem;
    }
}