:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --background-color: #f3f4f6;
    --error-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background: var(--background-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(37, 99, 235, 0.1) 0%, transparent 50%);
}

.auth-container {
    width: 100%;
    max-width: 420px;
    padding: 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
                0 10px 10px -5px rgba(0, 0, 0, 0.04);
    transform: translateY(0);
    transition: transform 0.3s ease;
}

.auth-container:hover {
    transform: translateY(-5px);
}

.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.form-group i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 2px solid #e5e7eb;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input.error {
    border-color: var(--error-color);
}

.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: none;
}

.submit-button {
    width: 100%;
    padding: 0.75rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.submit-button:hover {
    background: var(--primary-dark);
}

.submit-button:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.3);
}

.submit-button .spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* リンクスタイル */
.auth-links {
    text-align: center;
    margin-top: 1.5rem;
}

.auth-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.3s ease;
}

.auth-link:hover {
    color: var(--primary-dark);
}

/* 通知ボックス */
.notice-box {
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

/* 警告（オレンジ） */
.notice-box.warning {
    background-color: #fff7ed;
    border: 1px solid var(--warning-color);
}

.notice-box.warning i {
    color: var(--warning-color);
}

.notice-box.warning p {
    color: #9a3412;
}

/* 情報（青） */
.notice-box.info {
    background-color: #eff6ff;
    border: 1px solid var(--primary-color);
}

.notice-box.info i {
    color: var(--primary-color);
}

.notice-box.info p {
    color: #1e40af;
}

/* 成功（緑） */
.notice-box.success {
    background-color: #f0fdf4;
    border: 1px solid var(--success-color);
}

.notice-box.success i {
    color: var(--success-color);
}

.notice-box.success p {
    color: #166534;
}

.notice-box i {
    font-size: 1.25rem;
    margin-top: 0.25rem;
}

.notice-box p {
    font-size: 0.875rem;
    line-height: 1.5;
}

/* パスワード要件 */
.password-requirements {
    background-color: #f8fafc;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.password-requirements h3 {
    color: #475569;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.password-requirements ul {
    list-style: none;
}

.password-requirements li {
    color: #64748b;
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.password-requirements li i {
    font-size: 0.625rem;
}

.password-requirements li.valid {
    color: var(--success-color);
}

.password-requirements li.valid i {
    color: var(--success-color);
}

/* チェックボックス */
.remember-me {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #6b7280;
}

.remember-me input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 0.25rem;
    cursor: pointer;
}

.remember-me span {
    font-size: 0.875rem;
}

/* エラーメッセージ */
.login-error {
    background-color: #fef2f2;
    border: 1px solid var(--error-color);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.login-error i {
    color: var(--error-color);
    font-size: 1.25rem;
    margin-top: 0.25rem;
}

.login-error p {
    color: #991b1b;
    font-size: 0.875rem;
    line-height: 1.5;
}