* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --casper-blue: #0071e3;
    --casper-blue-hover: #0077ed;
    --casper-gray: #86868b;
    --casper-light-gray: #f5f5f7;
    --casper-border: #d2d2d7;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --white: #ffffff;
    --error: #ff3b30;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background-color: var(--casper-light-gray);
    color: var(--text-primary);
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
    min-height: 100vh;
}

.login-box {
    background: var(--white);
    border-radius: 18px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    padding: 56px 48px;
    max-width: 440px;
    width: 100%;
    margin: auto;
}

.logo {
    display: flex;
    justify-content: center;
    margin-bottom: 32px;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    font-size: 32px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 40px;
    letter-spacing: -0.015em;
    line-height: 1.25;
}

.login-form {
    width: 100%;
}

.input-group {
    position: relative;
    margin-bottom: 24px;
}

.input-field {
    width: 100%;
    padding: 18px 18px 10px 18px;
    font-size: 17px;
    border: 1px solid var(--casper-border);
    border-radius: 12px;
    background: var(--white);
    transition: all 0.2s ease;
    outline: none;
    font-family: inherit;
}

.input-field:focus {
    border-color: var(--casper-blue);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
}

.input-field:focus + .input-label,
.input-field:not(:placeholder-shown) + .input-label {
    top: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.input-label {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 17px;
    color: var(--casper-gray);
    pointer-events: none;
    transition: all 0.2s ease;
    background: var(--white);
    padding: 0 2px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--casper-gray);
    transition: color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-password:hover {
    color: var(--text-primary);
}

.eye-icon {
    width: 20px;
    height: 20px;
}

.form-actions {
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.remember-me {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
}

.remember-me input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    cursor: pointer;
    accent-color: var(--casper-blue);
}

.remember-me span {
    user-select: none;
}

.sign-in-button {
    width: 100%;
    background: var(--casper-blue);
    color: var(--white);
    border: none;
    border-radius: 12px;
    padding: 16px 24px;
    font-size: 17px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
    font-family: inherit;
}

.sign-in-button:hover {
    background: var(--casper-blue-hover);
}

.sign-in-button:active {
    transform: scale(0.98);
}

.arrow-icon {
    opacity: 0;
    transform: translateX(-8px);
    transition: all 0.2s ease;
}

.sign-in-button:hover .arrow-icon {
    opacity: 1;
    transform: translateX(0);
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 24px 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--casper-border);
}

.divider span {
    padding: 0 16px;
}

.passkey-button {
    width: 100%;
    background: var(--white);
    color: var(--text-primary);
    border: 1.5px solid var(--casper-border);
    border-radius: 12px;
    padding: 16px 24px;
    font-size: 17px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 32px;
    font-family: inherit;
}

.passkey-button:hover {
    background: var(--casper-light-gray);
    border-color: var(--casper-gray);
}

.passkey-button:active {
    transform: scale(0.98);
}

.passkey-icon {
    color: var(--casper-blue);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
    padding-top: 28px;
    border-top: 1px solid var(--casper-light-gray);
}

.link {
    color: var(--casper-blue);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
}

.link:hover {
    color: var(--casper-blue-hover);
    text-decoration: underline;
}

.page-footer {
    width: 100%;
    padding: 32px 20px;
    margin-top: auto;
}

.footer-content {
    max-width: 980px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 20px;
    font-size: 12px;
    color: var(--text-secondary);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.copyright {
    color: var(--text-secondary);
}

/* Loading state */
.sign-in-button.loading {
    pointer-events: none;
    opacity: 0.7;
}

.sign-in-button.loading .button-text::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* Error state */
.input-field.error {
    border-color: var(--error);
}

.input-field.error:focus {
    box-shadow: 0 0 0 4px rgba(255, 59, 48, 0.1);
}

.error-message {
    color: var(--error);
    font-size: 12px;
    margin-top: 6px;
    margin-left: 16px;
    display: none;
}

.input-group.has-error .error-message {
    display: block;
}

/* Responsive design */
@media (max-width: 768px) {
    .login-box {
        padding: 36px 28px;
        border-radius: 16px;
    }
    
    h1 {
        font-size: 28px;
        margin-bottom: 28px;
    }
    
    .input-field {
        font-size: 16px;
        padding: 14px 14px 6px 14px;
    }
    
    .sign-in-button {
        font-size: 16px;
        padding: 12px 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 12px;
    }
    
    .login-box {
        padding: 28px 20px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 8px;
    }
}