:root {
    /* typography */
    --ff-heading: "Oswald", sans-serif;
    --ff-body: "Inter", sans-serif;

    --text-7: 3.815rem;
    --text-6: 3.052rem;
    --text-5: 2.441rem;
    --text-4: 1.953rem;
    --text-3: 1.563rem;
    --text-2: 1.25rem;
    --text-1: 1rem;
    --text-0: 0.8rem;

    /* color palette */
    --blue-0: #e7f5ff;
    --blue-1: #d0ebff;
    --blue-3: #74c0fc;
    --blue-5: #339af0;
    --blue-7: #1c7ed6;
    --blue-9: #1864ab;

    --gray-0: #f8f9fa;
    --gray-1: #f1f3f5;
    --gray-3: #dee2e6;
    --gray-5: #adb5bd;
    --gray-7: #495057;
    --gray-9: #212529;

    --white: #fff;
    --black: #000;

    /* border radius */
    --border-0: 4px;
    --border-1: 8px;
    --border-2: 16px;
    --border-3: 32px;
}

.auth-main {
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
    padding: 48px 0;
}

.auth-section {
    width: 100%;
    display: flex;
    justify-content: center;
}

.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.auth-card {
    background: var(--white);
    border-radius: var(--border-2);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
    padding: 40px;
    width: 100%;
    max-width: 600px;
    box-sizing: border-box;
}

.auth-card__header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-card__title {
    font-size: var(--text-4);
    font-weight: 700;
    margin-bottom: 8px;
}

.auth-card__subtitle {
    font-size: 0.95rem;
    color: var(--gray-7);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-row .form-group {
    min-width: 0;
}

.form-row .form-input {
    width: 100%;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}

.form-label {
    font-size: var(--text-1);
    font-weight: 500;
}

.form-input {
    padding: 12px 16px;
    border: 1px solid var(--border-color, #ddd);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    width: 100%;
    box-sizing: border-box;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color, #2563eb);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted, #999);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--text-secondary, #666);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary, #666);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 3px;
    cursor: pointer;
}

.form-link {
    font-size: 0.875rem;
    color: var(--primary-color, #2563eb);
    text-decoration: none;
    font-weight: 500;
}

.form-link:hover {
    text-decoration: underline;
}

.auth-btn {
    width: 100%;
    padding: 14px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.auth-btn:hover {
    transform: translateY(-1px);
}

.auth-btn:active {
    transform: translateY(0);
}

.auth-divider {
    display: flex;
    align-items: center;
    margin: 24px 0;
}

.auth-divider::before,
.auth-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--border-color, #ddd);
}

.auth-divider span {
    padding: 0 16px;
    font-size: 0.875rem;
    color: var(--text-secondary, #666);
}

.social-auth {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 500;
    border: 1px solid var(--border-color, #ddd);
    border-radius: 8px;
    background: var(--white, #fff);
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.social-btn:hover {
    background: var(--bg-light, #f5f5f5);
    border-color: var(--border-hover, #ccc);
}

.social-btn--google {
    color: #333;
}

.social-btn--facebook {
    color: #1877f2;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 0.95rem;
    color: var(--text-secondary, #666);
}

@media (max-width: 480px) {
    .auth-card {
        padding: 24px 20px;
        margin: 0 16px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .form-options {
        flex-direction: column;
        align-items: flex-start;
    }

    .auth-card__title {
        font-size: 1.5rem;
    }

    .form-input {
        padding: 12px 14px;
    }
}