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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #6c757d;
    --white: #ffffff;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

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

/* ヘッダー */
header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* ヒーローセクション */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 6rem 2rem;
    text-align: center;
}

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

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    opacity: 0.9;
}

/* ワークスセクション */
.works-section {
    padding: 5rem 2rem;
    background-color: var(--light-gray);
}

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

.works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

/* ワークカード */
.work-card {
    background-color: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: block;
}

.work-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.work-card-image {
    height: 250px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.work-card:nth-child(1) .work-card-image {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.work-card:nth-child(2) .work-card-image {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.work-card:nth-child(3) .work-card-image {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.work-card:nth-child(4) .work-card-image {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.work-card:nth-child(5) .work-card-image {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.work-card:nth-child(6) .work-card-image {
    background: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
}

.work-number {
    font-size: 6rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.3);
    user-select: none;
}

.work-card-content {
    padding: 1.5rem;
}

.work-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.work-description {
    color: var(--dark-gray);
    font-size: 0.95rem;
}

/* フッター */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 2rem;
    text-align: center;
}

.footer-content p {
    opacity: 0.8;
    font-size: 0.9rem;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .works-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .nav-container {
        padding: 1rem;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .works-section {
        padding: 3rem 1rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 4rem 1rem;
    }

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

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

    .work-card-image {
        height: 200px;
    }

    .work-number {
        font-size: 4rem;
    }
}

/* ローディング画面 */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    pointer-events: none;
}

.loading-curtain {
    position: absolute;
    left: 0;
    width: 100%;
    height: 50%;
    background-color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: transform 1.2s cubic-bezier(0.65, 0, 0.35, 1);
}

.loading-curtain-top {
    top: 0;
    align-items: flex-end;
    padding-bottom: 1rem;
}

.loading-curtain-bottom {
    bottom: 0;
    align-items: flex-start;
    padding-top: 1rem;
}

.loading-text {
    font-size: 5rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    opacity: 0;
    animation: fadeInText 1s ease-in-out forwards;
}

/* ローディング終了時のアニメーション */
.loading-screen.loaded .loading-curtain-top {
    transform: translateY(-100%);
}

.loading-screen.loaded .loading-curtain-bottom {
    transform: translateY(100%);
}

.loading-screen.loaded .loading-text {
    animation: fadeOutText 0.5s ease-in-out forwards;
}

/* コンテンツのフェードインアニメーション */
header,
main,
footer {
    opacity: 0;
    animation: fadeInBody 0.8s ease-in-out 1.2s forwards;
}

/* ワークカードのアニメーション */
.work-card {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease-out forwards;
}

.work-card:nth-child(1) {
    animation-delay: 1.4s;
}

.work-card:nth-child(2) {
    animation-delay: 1.5s;
}

.work-card:nth-child(3) {
    animation-delay: 1.6s;
}

.work-card:nth-child(4) {
    animation-delay: 1.7s;
}

.work-card:nth-child(5) {
    animation-delay: 1.8s;
}

.work-card:nth-child(6) {
    animation-delay: 1.9s;
}

/* ヒーローセクションのアニメーション */
.hero-content {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease-out 1.3s forwards;
}

/* キーフレームアニメーション */
@keyframes fadeInText {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOutText {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

@keyframes fadeInBody {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* レスポンシブ対応 - ローディング画面 */
@media (max-width: 768px) {
    .loading-text {
        font-size: 3rem;
    }
}

@media (max-width: 480px) {
    .loading-text {
        font-size: 2rem;
    }
}