:root {
    --primary-color: #4A6FA5;
    --secondary-color: #166088;
    --accent-color: #16697A;
    --success-color: #489FB5;
    --light-bg: #F2F7F9;
    --white: #FFFFFF;
    --gray-100: #F8F9FA;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-600: #6C757D;
    --gray-800: #343A40;
    --dark-text: #212529;
    --shadow: rgba(0, 0, 0, 0.05);
    --shadow-darker: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Rajdhani', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--light-bg);
    color: var(--dark-text);
    line-height: 1.6;
    font-weight: 400;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

header {
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}

.logo {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
}

.logo-image {
    max-width: 180px;
    height: auto;
    transition: transform 0.3s ease;
}

.logo-image:hover {
    transform: scale(1.05);
}

h1 {
    font-size: 3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    position: relative;
}

main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.info {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--gray-600);
}

.login {
    text-align: center;
    padding: 3rem;
    background-color: var(--white);
    border-radius: 12px;
    box-shadow: 0 10px 30px var(--shadow);
    width: 100%;
    max-width: 480px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px var(--shadow-darker);
}

.login h2 {
    color: var(--secondary-color);
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.login .info {
    margin-bottom: 2rem;
    font-size: 1rem;
    color: var(--gray-600);
    max-width: 100%;
}

/* Auth Tabs */
.auth-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--gray-300);
}

.auth-tab {
    flex: 1;
    padding: 0.8rem 1rem;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--gray-600);
    font-size: 1.1rem;
    font-weight: 500;
    font-family: 'Rajdhani', 'Segoe UI', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    bottom: -2px;
}

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

.auth-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 600;
}

/* Auth Forms */
.auth-form {
    display: none;
    width: 100%;
    animation: fadeIn 0.3s ease-in-out;
}

.auth-form.active {
    display: block;
}

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

/* Form inputs */
#loginEmail,
#loginPassword,
#registerEmail,
#registerPassword,
#inviteCode {
    width: 100%;
    padding: 0.9rem 1.2rem;
    margin-bottom: 1rem;
    border: 2px solid var(--gray-300);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Rajdhani', 'Segoe UI', sans-serif;
    font-weight: 500;
    transition: all 0.3s ease;
    background-color: var(--white);
}

#loginEmail:focus,
#loginPassword:focus,
#registerEmail:focus,
#registerPassword:focus,
#inviteCode:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.1);
}

#loginEmail::placeholder,
#loginPassword::placeholder,
#registerEmail::placeholder,
#registerPassword::placeholder,
#inviteCode::placeholder {
    color: var(--gray-600);
    font-weight: 400;
}

/* Invite code field special styling */
#inviteCode {
    text-transform: uppercase;
    letter-spacing: 1px;
}

button#loginBtn,
button#registerBtn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(74, 111, 165, 0.3);
    margin-top: 0.5rem;
}

button#loginBtn::before,
button#registerBtn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: 0.6s;
}

button#loginBtn:hover,
button#registerBtn:hover {
    box-shadow: 0 6px 20px rgba(74, 111, 165, 0.4);
    transform: translateY(-2px);
}

button#loginBtn:hover::before,
button#registerBtn:hover::before {
    left: 100%;
}

button#loginBtn:active,
button#registerBtn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 10px rgba(74, 111, 165, 0.3);
}

/* Disabled button styling */
button#loginBtn:disabled,
button#registerBtn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    background: linear-gradient(135deg, var(--gray-300), var(--gray-600));
    box-shadow: 0 4px 10px rgba(108, 117, 125, 0.2);
}

button#loginBtn:disabled:hover,
button#registerBtn:disabled:hover {
    transform: none;
    box-shadow: 0 4px 10px rgba(108, 117, 125, 0.2);
}

button#loginBtn:disabled::before,
button#registerBtn:disabled::before {
    display: none;
}

.error {
    color: #dc3545;
    margin-top: 1rem;
    font-weight: 500;
    min-height: 1.5rem;
    font-size: 0.9rem;
}

.loading-spinner {
    display: none;
    width: 40px;
    height: 40px;
    border: 3px solid rgba(74, 111, 165, 0.1);
    border-radius: 50%;
    border-top: 3px solid var(--primary-color);
    animation: spin 1s linear infinite;
    margin: 1.5rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    font-size: 0.9rem;
    color: var(--gray-600);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 30%;
    right: 30%;
    height: 1px;
    background: linear-gradient(
        to right,
        transparent,
        var(--gray-300),
        transparent
    );
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    .login {
        padding: 2rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }

    button#loginBtn,
    button#registerBtn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }

    #loginEmail,
    #loginPassword,
    #registerEmail,
    #registerPassword,
    #inviteCode {
        padding: 0.8rem 1rem;
        font-size: 0.95rem;
    }

    .auth-tab {
        font-size: 1rem;
        padding: 0.7rem 0.8rem;
    }

    .login {
        padding: 1.5rem;
    }
}