/* === Google Fonts Import === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap');

/* === CSS Variables (Eye-Friendly Soft Theme) === */
:root {
    --font-primary: 'Inter', 'Helvetica Neue', 'Arial', 'Hiragino Sans', 'Meiryo', sans-serif;
    
    /* Soft color palette */
    --color-bg: #f8f9fa; /* Main background */
    --color-sidebar-bg: #ffffff; /* Sidebar background */
    --color-card-bg: #ffffff;    /* Card background */
    --color-text: #495057;       /* Main text color (soft dark gray) */
    --color-heading: #212529;   /* Heading color (darker gray) */
    --color-border: #dee2e6;     /* Border color */

    /* Soft accent color (teal/green) */
    --color-primary: #20c997;
    --color-primary-hover: #1baa80;
    --color-primary-focus-glow: rgba(32, 201, 151, 0.25);
    
    --color-secondary: #6c757d;
    --color-secondary-hover: #5a6268;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 3px 6px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.06);
}

/* === Animations === */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* === Reset & Base === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    display: flex;
    line-height: 1.7;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

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

/* === Layout === */
.sidebar {
    width: 260px;
    background: var(--color-sidebar-bg);
    border-right: 1px solid var(--color-border);
    color: var(--color-text);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    padding: 30px;
    overflow-y: auto;
    z-index: 10;
}

.main-content {
    margin-left: 260px;
    width: calc(100% - 260px);
    height: 100vh;
    padding: 40px;
    overflow-y: auto;
    animation: fadeIn 0.6s ease-out;
}

/* === Sidebar Content === */
.sidebar h1 {
    font-size: 24px;
    margin-bottom: 40px;
}

.sidebar h1 a {
    color: var(--color-heading);
    font-weight: 700;
    text-decoration: none;
}

.sidebar nav ul {
    list-style: none;
}

.sidebar nav li {
    margin-bottom: 5px;
}

.sidebar nav a {
    color: var(--color-text);
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    padding: 12px 15px;
    border-radius: 8px;
}

.sidebar nav a i {
    width: 20px;
    margin-right: 15px;
    text-align: center;
    color: #adb5bd;
    transition: color 0.3s ease;
}

.sidebar nav a:hover {
    background-color: #f1f3f5;
    color: var(--color-heading);
    text-decoration: none;
}
.sidebar nav a:hover i {
    color: var(--color-primary);
}

.sidebar nav a.active {
    color: var(--color-primary-hover);
    font-weight: 700;
    background-color: rgba(32, 201, 151, 0.1);
}
.sidebar nav a.active i {
    color: var(--color-primary);
}


/* === Main Content === */
.main-content header {
    margin-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 20px;
}

.main-content header h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-heading);
}

.event-card {
    background-color: var(--color-card-bg);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--color-border);
}

.event-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.event-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
}

/* === UI Elements === */
.button {
    background-color: var(--color-primary);
    color: #fff;
    border: none;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-right: 10px;
    margin-bottom: 10px;
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.button:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.button:active {
    transform: translateY(0);
}

.button-secondary {
    background-color: var(--color-secondary);
}
.button-secondary:hover {
    background-color: var(--color-secondary-hover);
}


.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
    color: var(--color-text);
}

.input-field {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background-color: #fff;
}
.input-field:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-primary-focus-glow);
}
/* === Responsive Styles for SP (max-width: 768px) === */
@media (max-width: 768px) {
    body {
        /* PCでは横並びだったサイドバーとコンテンツを縦並びに変更 */
        display: block;
    }

    .sidebar {
        /* サイドバーを画面上部のヘッダーとして再配置 */
        position: relative;
        width: 100%;
        height: auto;
        padding: 20px;
    }

    .sidebar h1 {
        font-size: 20px;
        margin-bottom: 20px;
    }
    
    .sidebar nav ul {
        /* ナビゲーションを横並びに */
        display: flex;
        flex-wrap: wrap;
        gap: 5px;
    }

    .sidebar nav li {
        margin-bottom: 5px;
    }

    .sidebar nav a {
        padding: 8px 12px;
        font-size: 14px;
    }

    .main-content {
        /* PC用の左マージンをなくし、幅を100%に */
        margin-left: 0;
        width: 100%;
        padding: 20px;
        height: auto; /* 高さを自動調整 */
    }

    .main-content header h2 {
        /* スマホ用に少し文字を小さく */
        font-size: 28px;
    }

    .event-card {
        padding: 20px;
    }

    .event-card h3 {
        font-size: 18px;
    }
    
    .button {
        padding: 10px 16px;
        font-size: 14px;
    }
}