:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}
body {
    font-family: 'Noto Sans JP', sans-serif;
    background: var(--bg-gradient);
    height: 100vh;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    display: flex;
    overflow: hidden;
    width: 100%;
    max-width: 900px;
    min-height: 550px;
    margin: 20px;
}
/* 左側のビジュアル画像エリア */
.login-visual {
    flex: 1;
    background: linear-gradient(rgba(44, 62, 80, 0.3), rgba(44, 62, 80, 0.3)), 
                url('/img/main_login.avif'); /* 織物・テキスタイルの柔らかな画像 */
    background-size: cover;
    background-position: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 40px;
    color: white;
    position: relative;
}
.login-visual::after {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.1);
}
.visual-text {
    position: relative;
    z-index: 1;
}
.visual-text h2 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    font-weight: 700;
}
/* 右側の入力フォームエリア */
.login-form-container {
    flex: 1;
    padding: 0 50px 60px 50px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 30px;
    color: var(--primary-color);
}
.brand-logo h1 {
    font-size: 1.4rem;
    margin: 0;
}
.login-header h2 {
    font-size: 1.2rem;
    color: #64748b;
    margin-bottom: 30px;
    font-weight: 600;
}
.form-group {
    margin-bottom: 20px;
    position: relative;
}
.form-group i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
}
.form-control {
    width: 100%;
    padding: 20px 15px 20px 45px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 1rem;
    transition: all 0.3s ease;
}
.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(52, 152, 219, 0.1);
}
.btn-login {
    width: 100%;
    background-color: #12395d;
    color: white;
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.3s ease;
    text-decoration: none;
    display: block;
    text-align: center;
    margin-top: 10px;
}
.btn-login:hover {
    background: #446c92ff;
    color: white;
}
.help-block {
    color: #e53e3e;
    font-size: 0.8rem;
    margin-top: 5px;
    display: block;
}
/* スマホ対応：画像を消してフォームを全幅に */
@media (max-width: 768px) {
    .login-visual { display: none; }
    .login-form-container { padding: 40px 30px; }
}