/* 基本スタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--black-color);
    background-color: var(--white-color);
    margin-bottom: 3%;
}

/* ===========================
   ヘッダー共通スタイル
   =========================== */
.site-header {
    background-color: var(--main-color);
    color: var(--white-color);
    padding: 0.5rem 0;
}

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

.header-left .site-title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 2%;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
    cursor: pointer;
    padding: 5% 8%;
    border-radius: 15px;
    transition: background 0.3s;
    font-size: 14px;
    white-space: nowrap;
}

.user-info:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* TODO */
.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    color: var(--white-color);
    text-decoration: none;
    flex-shrink: 0;
}

.btn-icon img {
    transition: transform 0.3s;
}

/* 設定アイコン */
.setting:hover img {
    transform: rotate(90deg);
}

/* ホームアイコン */
.home:hover img {
    transform: scale(1.2);
}

.btn-logout {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--light-gray-color);
    color: var(--main-color);
    padding: 0.5rem 1.25rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    white-space: nowrap;
}

.user-info:hover .btn-logout {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    background-color: var(--white-color);
}

.btn-logout:hover {
    background: var(--light-gray-color);
    color: var(--main-hover-color);
}

/* ===========================
   メインコンテンツ
   =========================== */

/* ===========================
   メッセージ表示
   =========================== */
.messages {
    margin-bottom: 1.5rem;
}

.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-weight: 500;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-left: 4px solid var(--accent-color);
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border-left: 4px solid #dc3545;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border-left: 4px solid #ffc107;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border-left: 4px solid #17a2b8;
}

/* ===========================
   共通ボタンスタイル
   =========================== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background: var(--main-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.4);
}

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

.btn-secondary:hover {
    background: var(--accent-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 255, 85, 0.4);
}

.btn-danger {
    background: #dc3545;
    color: var(--white-color);
}

.btn-danger:hover {
    background: #c82333;
}