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

:root {
    --primary-blue: #02567a;
    --dark-blue: #01384f;
    --light-bg: #dee2e6;
    --card-bg: #f5f7f9;
    --text-dark: #0a0a0a;
    --text-gray: #555555;
    --border-color: #ccc;
    --accent-blue: #006eff;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #dee2e6 0%, #f5f7f9 100%);
    color: var(--text-dark);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(2, 86, 122, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 110, 255, 0.08) 0%, transparent 50%);
    animation: backgroundMove 20s ease-in-out infinite;
    pointer-events: none;
}

@keyframes backgroundMove {
    0%, 100% { transform: translateX(0px) translateY(0px); }
    50% { transform: translateX(30px) translateY(-30px); }
}

.login-container {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 50px 40px;
    width: 420px;
    max-width: 90vw;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(2, 86, 122, 0.05);
    position: relative;
    z-index: 10;
    animation: slideIn 0.6s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.logo-section { 
    text-align: center; 
    margin-bottom: 40px; 
}

.logo-text { 
    font-size: 36px; 
    font-weight: bold; 
    font-style: italic; 
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.tu { 
    color: var(--text-dark); 
}

.torneo { 
    color: var(--accent-blue); 
}

.subtitle { 
    color: var(--text-gray); 
    font-size: 15px; 
    font-weight: 400;
    margin-top: 8px;
}

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

.form-group label { 
    display: block; 
    margin-bottom: 8px; 
    color: var(--text-dark); 
    font-size: 14px; 
    font-weight: 500; 
}

.input-wrapper { 
    position: relative; 
}

.input-wrapper i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-gray);
    transition: color 0.3s ease;
    font-size: 18px;
}

.form-group input {
    width: 100%;
    padding: 14px 16px 14px 48px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-dark);
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s ease;
    outline: none;
}

.form-group input:focus {
    border-color: var(--primary-blue);
    background: white;
    box-shadow: 0 0 0 3px rgba(2, 86, 122, 0.1);
}

.form-group input:focus + i { 
    color: var(--primary-blue); 
}

.form-group input::placeholder { 
    color: #999; 
}

.password-toggle {
    position: absolute;
    right: 16px; 
    top: 67.5%;
    transform: translateY(-50%);
    color: var(--text-gray);
    cursor: pointer;
    transition: color 0.3s ease;
    font-size: 20px;
    z-index: 10;
}

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

.forgot-password { 
    text-align: right; 
    margin-top: -8px;
    margin-bottom: 28px; 
}

.forgot-password a {
    color: var(--primary-blue);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.forgot-password a:hover { 
    color: var(--dark-blue);
    text-decoration: underline; 
}

.login-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

.login-btn::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: left 0.5s;
}

.login-btn:hover::before { 
    left: 100%; 
}

.login-btn:hover { 
    transform: translateY(-2px); 
    box-shadow: 0 10px 25px rgba(2, 86, 122, 0.3); 
}

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

.divider { 
    text-align: center; 
    margin: 30px 0; 
    position: relative; 
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0; 
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.divider span {
    background: white;
    padding: 0 20px;
    color: var(--text-gray);
    font-size: 14px;
    position: relative;
    z-index: 1;
}

.register-link { 
    text-align: center; 
    color: var(--text-gray); 
    font-size: 15px; 
}

.register-link a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

.back-btn {
    position: absolute;
    top: 24px; 
    left: 24px;
    background: white;
    border: 1px solid var(--border-color);
    color: var(--text-dark);
    padding: 12px 18px;
    border-radius: 10px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.back-btn:hover {
    background: var(--card-bg);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(2, 86, 122, 0.15);
}

@media (max-width: 768px) {
    .login-container { 
        padding: 40px 30px; 
        margin: 20px; 
    }
    
    .logo-text { 
        font-size: 32px; 
    }
    
    body {
        padding: 20px 0;
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: 35px 25px;
    }
    
    .logo-text {
        font-size: 28px;
    }
    
    .back-btn {
        top: 16px;
        left: 16px;
        padding: 10px 14px;
        font-size: 13px;
    }
}

.loading {
    display: none;
    width: 20px; 
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    margin-right: 10px;
}

@keyframes spin { 
    to { transform: rotate(360deg); } 
}

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

.form-group input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.form-group.error input {
    border-color: #e74c3c;
    animation: shake 0.5s;
}

.error-message {
    color: #e74c3c;
    font-size: 13px;
    margin-top: 6px;
    display: none;
}

.form-group.error .error-message {
    display: block;
}