@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

:root {
    --primary-color: #004d99;
    --primary-hover: #0073e6;
    --text-color: #374151;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --input-bg: #f9fafb;
    --input-border: #e5e7eb;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    color: var(--text-color);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 1200px;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.login-header {
    padding: 30px 30px 20px;
    text-align: center;
    background-color: var(--primary-color);
    color: white;
}

.login-header h2 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 500;
}

.login-header p {
    margin-top: 8px;
    opacity: 0.9;
    font-weight: 300;
}

.login-form {
    padding: 30px;
}

.form-group {
    margin-bottom: 24px;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 16px;
    color: #9ca3af;
}

input {
    width: 100%;
    padding: 14px 14px 14px 45px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

input::placeholder {
    color: #9ca3af;
}

.btn {
    width: 100%;
    padding: 14px;
    font-size: 1rem;
    font-weight: 500;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

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

.btn i {
    font-size: 0.9rem;
}

@media (max-width: 480px) {
    .login-container {
        max-width: 100%;
        border-radius: 0;
        box-shadow: none;
    }
}