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

:root {
    --primary: #6C5CE7;
    --secondary: #A29BFE;
    --accent: #FD79A8;
    --dark: #2D3436;
    --gray: #636E72;
    --light-gray: #DFE6E9;
    --white: #FFFFFF;
    --success: #00B894;
    --error: #D63031;
    --warning: #FDCB6E;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== ヘッダー ===== */
.header {
    background: var(--white);
    border-bottom: 1px solid var(--light-gray);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary);
}

.nav {
    display: flex;
    gap: 20px;
    align-items: center;
}

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

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

/* ===== ボタン ===== */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(108, 92, 231, 0.3);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary);
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    border: 2px solid var(--primary);
    transition: all 0.3s;
}

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

.btn-large {
    font-size: 18px;
    padding: 16px 40px;
}

/* ===== ヒーローセクション ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    padding: 100px 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 56px;
    font-weight: bold;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.hero-note {
    font-size: 14px;
    opacity: 0.8;
}

/* ===== 機能セクション ===== */
.features {
    padding: 80px 0;
    background: var(--white);
}

.section-title {
    font-size: 40px;
    text-align: center;
    margin-bottom: 20px;
    color: var(--dark);
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: var(--gray);
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.feature-card {
    background: var(--white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.feature-icon {
    font-size: 60px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--dark);
}

.feature-card p {
    color: var(--gray);
    line-height: 1.8;
}

/* ===== デモセクション ===== */
.demo {
    padding: 80px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.step {
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 22px;
    margin-bottom: 10px;
    color: var(--dark);
}

.step p {
    color: var(--gray);
}

.demo-cta {
    text-align: center;
    margin-top: 60px;
}

/* ===== 料金プラン ===== */
.pricing {
    padding: 80px 0;
    background: var(--white);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.pricing-card {
    background: var(--white);
    border: 2px solid var(--light-gray);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    position: relative;
    transition: transform 0.3s, box-shadow 0.3s;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.pricing-card.popular {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.05) 0%, rgba(253, 121, 168, 0.05) 100%);
    transform: scale(1.05);
}

.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    padding: 5px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
}

.plan-header h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--dark);
}

.price {
    margin-bottom: 30px;
}

.price .currency {
    font-size: 24px;
    vertical-align: top;
}

.price .amount {
    font-size: 56px;
    font-weight: bold;
    color: var(--primary);
}

.price .period {
    font-size: 18px;
    color: var(--gray);
}

.plan-features {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}

.plan-features li {
    padding: 12px 0;
    border-bottom: 1px solid var(--light-gray);
    color: var(--dark);
}

.btn-plan {
    display: block;
    width: 100%;
    padding: 15px;
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

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

/* ===== CTAセクション ===== */
.cta {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    text-align: center;
}

.cta h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.cta p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
}

/* ===== フッター ===== */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    margin-bottom: 20px;
    font-size: 18px;
}

.footer-section a {
    display: block;
    color: var(--light-gray);
    text-decoration: none;
    margin-bottom: 10px;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: var(--light-gray);
}

/* ===== 認証ページ ===== */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.auth-box {
    background: var(--white);
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    max-width: 450px;
    width: 100%;
}

.auth-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--dark);
    font-size: 32px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--light-gray);
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.btn-submit {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    border: none;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s;
}

.btn-submit:hover {
    transform: translateY(-2px);
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    color: var(--gray);
}

.auth-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

/* ===== ダッシュボード ===== */
.dashboard {
    min-height: 100vh;
    background: #F5F6FA;
}

.dashboard-header {
    background: var(--white);
    padding: 20px 0;
    border-bottom: 1px solid var(--light-gray);
    margin-bottom: 40px;
}

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

.user-info {
    display: flex;
    align-items: center;
    gap: 20px;
}

.credits-badge {
    background: var(--primary);
    color: var(--white);
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 600;
}

.dashboard-content {
    padding: 40px 0;
}

.projects-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.project-card {
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.project-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--dark);
}

.project-meta {
    color: var(--gray);
    font-size: 14px;
    margin-bottom: 15px;
}

.project-status {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.status-completed {
    background: #E8F5E9;
    color: var(--success);
}

.status-draft {
    background: #FFF3E0;
    color: var(--warning);
}

.status-processing {
    background: #E3F2FD;
    color: #2196F3;
}

/* ===== アラート ===== */
.alert {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-success {
    background: #E8F5E9;
    color: var(--success);
    border: 1px solid var(--success);
}

.alert-error {
    background: #FFEBEE;
    color: var(--error);
    border: 1px solid var(--error);
}

.alert-warning {
    background: #FFF3E0;
    color: var(--warning);
    border: 1px solid var(--warning);
}

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .features-grid,
    .pricing-grid,
    .steps {
        grid-template-columns: 1fr;
    }
    
    .nav {
        flex-direction: column;
        gap: 10px;
    }
    
    .auth-box {
        padding: 30px 20px;
    }
}