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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1e293b;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 24px;
}

.login-card {
    background: white;
    border-radius: 16px;
    padding: 48px 40px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07), 0 10px 13px rgba(0, 0, 0, 0.08);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    width: 220px;
    height: auto;
    display: block;
    margin: 0 auto 8px auto;
}

.login-title {
    font-size: 28px;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 8px;
}

.login-subtitle {
    font-size: 14px;
    color: #64748b;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #475569;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid #e2e8f0;
    border-radius: 8px;
    background: #f8fafc;
    color: #1e293b;
    font-size: 14px;
    transition: all 0.3s ease;
}

.form-group input:hover {
    border-color: #cbd5e1;
    background: #f1f5f9;
}

.form-group input:focus {
    outline: none;
    border-color: #2563eb;
    background: white;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input::placeholder {
    color: #94a3b8;
}

.login-button {
    width: 100%;
    padding: 12px 16px;
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.login-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.login-button:active:not(:disabled) {
    transform: translateY(0);
}

.login-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.error-message {
    background: #fee2e2;
    border: 1px solid #fecaca;
    color: #dc2626;
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 20px;
    display: none;
    animation: slideDown 0.3s ease-out;
}

.error-message.show {
    display: block;
}

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

.loading {
    display: none;
    text-align: center;
    color: #64748b;
    font-size: 13px;
}

.spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid #e2e8f0;
    border-top-color: #2563eb;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}

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

.loading.show {
    display: block;
}

/* RESPONSIVE DESIGN */
@media (max-width: 480px) {
    .login-container {
        max-width: 100%;
        padding: 16px;
    }

    .login-card {
        padding: 32px 24px;
        border-radius: 12px;
    }

    .login-header {
        margin-bottom: 32px;
    }

    .logo {
        font-size: 32px;
        margin-bottom: 12px;
    }

    .login-title {
        font-size: 24px;
    }

    .login-subtitle {
        font-size: 13px;
    }

    .form-group {
        margin-bottom: 16px;
    }

    .form-group label {
        font-size: 12px;
    }

    .form-group input {
        padding: 11px 12px;
        font-size: 13px;
    }

    .login-button {
        padding: 11px 14px;
        font-size: 14px;
        margin-bottom: 16px;
    }

    .error-message {
        padding: 10px 12px;
        font-size: 12px;
        margin-bottom: 16px;
    }

    .loading {
        font-size: 12px;
    }

    .spinner {
        width: 12px;
        height: 12px;
        margin-right: 6px;
    }
}