/* Login Page */

.login-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100dvh;
    gap: 8px;
}

/* Branding */

.login-header {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 420px;
    max-width: 90vw;
    gap: clamp(8px, 3vw, 16px);
    animation: fadeIn 1.0s ease;
    transition: width 0.2s ease;
}

.app-logo {
    height: clamp(60px, 12vw, 120px);
    width: auto;
}

.university-brand {
    width: clamp(140px, 45vw, 260px);
    height: auto;
}

/* Login Card */

.login-wrapper {
    position: relative;
    width: 420px;
    max-width: 90vw;
    height: 480px;
    max-height: 90dvh;
    perspective: 1200px;
    animation: fadeIn 1.0s ease;
    transition: width 0.2s ease;
}

.login-container {
    position: absolute;
    inset: 0;
    padding: clamp(20px, 5vw, 40px);
    border-radius: 18px;
    background: var(--card);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    backface-visibility: hidden;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.22, 1.0, 0.36, 1.0), opacity 0.3s;
    box-shadow:
            0 20px 40px rgba(0, 0, 0, 0.08),
            0 8px 20px rgba(0, 0, 0, 0.04);
}

.login-container h2 {
    margin: 12px;
    color: var(--text);
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 1px;
}

input {
    width: 100%;
    padding: 12px 16px;
    margin: 6px 0;
    border-radius: 8px;
    border: 1px solid var(--border);
    font-size: 14px;
    color: var(--text);
    background: #fafafa;
    transition: border 0.2s ease, box-shadow 0.2s ease;
}

input:focus {
    outline: none;
    border: 1px solid var(--primary);
    background: white;
    box-shadow: 0 0 0 3px var(--primary-soft);
}

#login-error {
    margin: 64px 10px 10px 10px;
}

/* Sign in Divider */

.divider {
    display: flex;
    align-items: center;
    margin: 20px 0;
    color: var(--text);
    font-size: 14px;
}

.divider::before,
.divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--text);
}

.divider span {
    padding: 0 12px;
}

/* Card Flip */

#login-card {
    transform: rotateY(0deg);
}

#signup-card {
    transform: rotateY(180deg);
}

.login-wrapper.flipped #login-card {
    transform: rotateY(-180deg);
}

.login-wrapper.flipped #signup-card {
    transform: rotateY(0deg);
}

.login-wrapper.flipped #login-card {
    pointer-events: none;
}

.login-wrapper:not(.flipped) #signup-card {
    pointer-events: none;
}

/* Animations */

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Media Queries */

@media (max-width: 600px) {
    .login-container {
        padding: 24px;
    }
}