.auth-card {
    background: rgba(var(--surface-color-rgb, 255, 255, 255), 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(198, 198, 205, 0.3);
    border-radius: 1.25rem;
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.1);
    padding: 2.5rem;
    transition: transform 0.3s ease;
}
.auth-card:hover {
    transform: translateY(-4px);
}
.otp-container {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 2rem 0;
}
.otp-input {
    width: 2.75rem;
    height: 3.25rem;
    text-align: center;
    font-size: 1.125rem;
    font-weight: 600;
    border: 1.5px solid #c6c6cd;
    border-radius: 0.625rem;
    background-color: #ffffff;
    color: var(--text-main, #0b1c30);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
}
@media (min-width: 375px) {
    .otp-input { width: 3rem; height: 3.5rem; font-size: 1.25rem; }
}
@media (min-width: 640px) {
    .otp-container { gap: 0.75rem; }
    .otp-input { width: 3.5rem; height: 4rem; font-size: 1.5rem; }
}
.otp-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(var(--primary-color-rgb, 0, 0, 0), 0.1);
    background-color: #f8f9ff;
}
.otp-input.success {
    border-color: #10b981 !important;
    background-color: #ecfdf5 !important;
    color: #065f46 !important;
    animation: otp-success 0.5s ease-out;
}
.otp-input.error {
    border-color: #ef4444 !important;
    background-color: #fef2f2 !important;
    color: #991b1b !important;
    animation: otp-error 0.5s ease-out;
}
@keyframes otp-success {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.08); }
}
@keyframes otp-error {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}
.btn-auth {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #ffffff !important;
    font-weight: 700;
    padding: 1.125rem;
    border-radius: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(var(--primary-color-rgb, 0, 0, 0), 0.2);
}
.btn-auth:hover {
    box-shadow: 0 6px 20px rgba(var(--primary-color-rgb, 0, 0, 0), 0.3);
    filter: brightness(1.1);
    transform: translateY(-2px);
}
.btn-auth:active { transform: translateY(0); }
.btn-auth:disabled { opacity: 0.7; cursor: not-allowed; transform: none !important; }
.auth-icon-container {
    width: 4.5rem;
    height: 4.5rem;
    background: linear-gradient(135deg, #f0f4ff, #ffffff);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.05);
}
.auth-icon {
    font-size: 2.25rem;
    color: var(--secondary-color);
}
.hidden { display: none !important; }
.auth-footer-links {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: center;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted, #45464d);
}
.auth-footer-links a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s;
}
.auth-footer-links a:hover { color: var(--primary-color); }